Products info
Gideon Ariel
Contact us
Sportscience Web site
Cyberspace University
Coporation Profile
Searching the Site

picture WWW:
Use this form to send us your feedback.
picture Orders:
Use this form to place your order(s).
picture Corporate Office:
Voice:(949) 858-4216
Fax:  (949) 858-5022
picture Sales and Service:
Voice:(858) 874-2547
Fax:  (858) 874-2549
picture E-Mail:
picture Corporate Office
6 Alicante Street
Trabuco Canyon, CA 92679
picture Sales and Service:
4891 Ronson Court, Suite F
San Diego, CA 92111
picture The Webmaster
6 Alicante
Trabuco Canyon, CA 92679


Users Comments

Dr. Ariel,

I am currently a group leader in Professor Cairns' Sports Science class here at the University of Tulsa. We are working in groups analyzing different skills using your program. I just wanted to thank you for allowing us to use the mobile copies of APAS. I know that it made my life much easier. My group is composed of myself and a fellow softball player here at TU, and with traveling the mobile copies were life savers in working on our project. Also, there were several other athletes that took advantage of the mobile copies including other fellow softball players, volleyball players, cheer leaders, and even some football players. Being able to work on these projects while we were on the road was so nice. Usually we would have had to schedule more time in the lab in order to work on projects, more time that we would not have really had in our busy days. I just wanted you to know that we are very thankful and your program has been pretty fun to work with.

Thanks again. We really appreciated it!

Brooke Smart and many fellow classmates

From: Leonard Elbaum <>
Date: Thu, Jan 14, 2010 at 1:21 PM
Subject: RE: Question re window 7
To: Gideon Ariel <>

Hey Gideon,

Just FYI, you should be pretty f--king proud that your 35 year old software still works. Its the start of a new term, and I'm teaching the class where some 46 students will be using some part of the system for their term projects . . . I did a quick demo, worked fine.

Nothing better than for explaining position/velocity/acceleration to a bunch of really nice, sweet physical therapy students who haven't figured out that the 'physical' in physical therapy is for physics.

And, I have a new Chairperson, who had a Motion Analysis system at his university, and immediately requested $$ for a new system here. We'll see what happens. He had only heard of your system, that is was a piece of crap. I let him play with some gait studies I did over the summer using display and view. I know you are used to this, but his jaw just dropped. Then I showed him the APAS price site, and he almost peed himself. I never even got as far as capdv and autodigitize, dlt and wireframing on the fly.

He still wants the motion analysis system, and after talking to him, I know why. He actually does not understand how the systems work (had a physical education degree from years ago) . . he learned the keystrokes, and so he is ready to go, as long as everything is the same as he learned already. He is a really smart guy, and very good natured. Just never had the chance to actually study engineering, or math, or computer programming.

Well, so much for the real world. Sorry for going on. I'm always happy to know that you are still productive, still walking the earth. Best wishes for a great 2010, and keep in touch. Remember I owe you many favors and courtesies, so do call on them sometime so I can get my own Karma on track before my time is over (no, I'm not expecting it soon . . .still too fat, but otherwise happy and healthy).


Hi Emilie:
I do not know one customer with Motion Analysis that their system is working.
In our company, the customers coming first. All our people in our company have Ph.D.s and are bunch of scientists. Jeremy is one of them and he is with me now for 35 years. We are all getting old but our brain is still very young....LOL
I glad we were able to fix somethings for the Windows 7. We will fix them all, it is only a matter of time.
All the best
- Hide quoted text -

1. The APAS is a wide and varied toolbox for the professional Biomechanist, Physical Therapist, Doctor, Researcher, etc. It is capable of displacement, velocity and acceleraton measurements of a body segment or body joint. It is therefore possible to precisely measure human movement to within 1% of accuracy. If the movement is done repeatedly (gait, shoulder flexion, etc.) it is further possible to determine human consistency in the activity being measured. If you add peripherals such as force plates, EMG, it is than possible to broaden the toolbox application to kinetic forces and muscle electrical activity during motion. This also includes balance.
Therefore, between movement, kinetic forces (strength) and muscle activity, you can analyze any kinematic (motion analysis) and/ or kinetic (forces) that make up human performance.

2. Extraction of data: The APAS as it now exists is fully capable of extracting all the above data and analyzing it numerically or graphically with one of its many modules. One can extract movement data manually, graph results and extract mathematical data streams to get results.

3. FCE information: The medical and insurance community needs a method of measuring the functional ability of an Examinee after recovery of injury, either for workers compensation, disability trauma or automobile accidents. The APAS does not diagnosis but is used to assess residual dysfunction in terms of joint or body movement, total work strength or individual limb strength, muscle function and balance. With this information, the professional can assess residual effects of an injury. This data is than used to match the individuals current ability with his/ her job and decide whether the individual can return to full duty, partial duty or not at all. The data is objective and definitive in terms of results. The judgment of return to work is subjective and made by the professional when the objective data is in hand and assessed with regard to the professionals understanding of the diagnosis, surgery, treatment, complaints, etc. of the Examinee. This data can be extracted and formed in a simple and understandable report to the Insurance Company, Case Manager and/ or Doctor.

4. The process: The process of performing data collection, data reduction, data extraction and report formation can be done manually. Unfortunately, since it involves multiple sets of data to be accurate, this process can take many hours to perform. This is not practical in a business. Therefore, the APAS user can employ a variety of methods to streamline this process. One can hire a programmer to help. Often, this is a disaster because the programmer does not understand the system, or the goal of analysis, as Reuven has apparently found out.

5. The solution: Ariel Dynamics has the resources to work with a client to develop a streamline approach to data extraction and report formation. This is not a canned off the shelf program because each client has a unique set of needs and goals. However, the information necessary for FCE is finite (depending upon body part information). Therefore, with the aid of the Ariel Dynamics team, a PAR (performance analysis report mechanism) can be developed to suit the need of the client.

6. How to start: Israel FCE company needs to buy basic equipment (APAS) and cameras. One or two cameras is good but three is optimum. Start with simple analysis and add peripherals as the market demands, based on necessary information to please the industry and legal system.

In summary, to develop a streamlined report mechanism for FCE in the Israeli market, we need to form some sort of cooperative basis between ADI and the new Israeli FCE company. Together we can make a program that is cost effective for the insurance industry and profitable for the principles. We have done it many times before and have working models in place for many years. ADI remains ready to participate in this effort with its many resources.


On Fri, Jan 15, 2010 at 3:19 PM, Emilie Foster <> wrote:

Dear Gideon,

The CapDV help file works as does the APAS2txt. I know the differences in the operating systems are difficult to keep up with the software. I know how expensive Motion Analysis is. I have a golf pro here who bought a 3-d golf analysis system out of California and paid more than $100,000 for it. He has had it for about a year and does not know how to operate it. He was just using the video as 2-d with no numbers. He had a problem with it, and called to get support only to find that the company went bankrupt and he is just out of luck. Sometimes the fast way is not always the best way.

It is probably better for me to be the guinea pig on the Windows 7 since you were kind enough to give me a reduced price! Anytime there is something that I might be able to help you with, just let me know.

Thanks for all your help. Jeremy is great!


Dear Gideon,

This is exactly why I purchase from you and have encouraged many people to do the same. It is just unfortunate that there is a large learning curve because there are so many aspects to doing a study. I have trained fifty or more people on the system, but it does take time. I have maybe 15,000 studies done on APAS. The information that is obtained is so useful and beneficial, especially to the high level athlete. I hope that you have someone to train so that the quality of what you have achieved will not be compromised in the future.

Thanks so much for creating such a wonderful tool!


Hi Gideon,

This is really fantastic, did they really build it on sand? I noticed all the unusual falls during the twists.

I have some news for you:

Finally I have my gaitlab ready with your new system. Five cameras are sampled directly to the computer. I have build an electronic device, which is triggered by a photocell activated by the subjects leg just before the first platform. Then this device sends an electronic sound signal to all five cameras and they are synchronized and trimmed automatically. At the same time a trigger is send to the analog system.
All wires are layed in permanently and hidden in the walls. We have also put up videolights for each camera, so we can use reflective markers. We are really fond of it, its works perfectly. We used three 10 m and two
15 m wires for the digital video, the ones you send me and they work.
You must come and see it.

Poul arrives in LA next Monday with his wife and son. They will stay for six months and he is going to work at UCLA. He brings his newly developed Blue Tooth EMG system with preamps. I am sure he will love to demonstrate it and if you want you may sell it for him. It is a really elegant light weight system and it requires no ad-converter. You can reach him on

I am responsible for a brand new medical engineering study at our university. The students will have to learn about the APAS system as they have to perform a gait analysis in our gaitlab. If they download APAS Light (is that possible?) can they then digitize five cameras with this version?

Due to this new education I had a permanent position available in my department. Tine Alkjr got the postion and is now assistant professor.
I think you remember her, she has used your system now for many yeaars for gait analysis and will continue to do that in her new position.

Best wishes

Hi Gideon,


What great news, it is fantastic. I am so happy for both of you. I am ready at the computer to watch thed wedding, if I can just figure out the local time here.

Have you heared from Poul about the EMG-system, he is living in Santa Monica for the next 10 months. I was in fact there last week, but I was rushing through, so I didn’t even get time to investigate wheter you were home or not. You were probably not home, the last three times I was in LA you were travelling.  However, I am very sorry I would have liked to see you. I was with the family (children and son in law) and we went to Grand Canyon and Las Vegas, but we were very limited in time, we were only away from home 9 days. We had our second wedding (25 years), you can reach that too, if you live long enough J


As I told you, we have got a new education here for engineers (medicine and engineering) and we teach them all APAS, ie we spit out 60 engineers a year knowing about the APAS. We give them a rehearsel of gait analysis in out gaitlab with two force plates and five digital cameras. The new system is working perfectly with five cameras and the sync on the sound track, the trimming, the automatic digitizing etc. The students are forced to digitize a gait cycle, so I need to set up a number of computers for the students. I ask you, therefore, if I can install the system on five computers, if so I will send you the codes for the computers.


If you need for promotion, I can send you avi and ana files containing five cameras and two platforms all synchronized. As you will recall, we put an electronic sound signal on the digital cameras for synchronization. I can provide a description of the electronic device, if it should interest any of your costumors. Jeremy has done a real good job, for example we trigger the sound signal by a photocell, but when the subject walks through the cell, he passes with both legs. That gives two markers on the sound track, but the software gives us the possibility to manually point out the first trigger, if by incident the second trigger signal was the largest, excellent. Please send him my regards.


So as you understand we are VERY happy with the new capture system.


Best wishes



Erik B. Simonsen, associate prof. (lektor), Ph.D.

Inst. Med. Anatomy, University of Copenhagen

Blegdamsvej 3, DK-2200 Copenhagen N.




Phone: +45 3532 7230




I am at home for the weekend, and don't have your direct address, but thought I would write anyway.

So, after over a goddam year waiting for some very stupid politics, I finally got a chance to setup the updated system you all sent out about a year ago . . .

Well, I am duly impressed, and wanted to offer congratulations, homage, appreciation, etc . . ..

The CAP DV with 5 cameras and the audio synch worked exactly as described, first time, flawlessly  . . . .very, very neat.

I have several students ( and a few projects of my own) coming up, and I'll keep you posted as the system gets used with some regularity.

I'm also getting a EE major to set up a marker set for gait analysis using LEDs from radio shack, instead of reflectors.  With the video so unobtrusive, I don't want to floodlight the populatino of mostly kids who will be passing through . . and then I don't have to worry about cameras picking up the other camera's light . . this will give me nicer videos to show, and make the digitizing easier. 

I'll keep you posted . . .and if you have already done this, or have a suggestion, don't hesitate to offer it.

Hope your last days of summer are filled with good times, and hope to see you sometime when you pass through Miami?

all the best,


Leonard Elbaum, EdD, PT
Please reply to:
Associate Professor, Department of Physical Therapy
Florida International University
Miami, Florida 33199

Dear Dr. Rahmatalla
I have been using APAS for 18 years.  I am now using APAS-XP exclusively for all studies.  It is an amazing innovation.
I have found the best configuration is a 6 point star.  With 20 feet width you are borderline for seeing the whole body with each camera.  However, I have performed full gait with a 20 by 24 room.  There are three things you can do to over-come the minor difficulty of the 20 width.  If you are using 6 cameras now in the same space, you have probably overcome the difficulty already.  I use ceiling mounted cameras to gain additional distance from the subject (I have 10 ft ceilings).  I also arrange the cameras in a manner that no camera is 90 degrees to the 20 ft width.  Third, you can use wide angle lenses if necessary, on some of the cameras.  However, with 5 to 6 cameras, it is unlikely that you will have to go to wide angle.  Remember, you only need 2 camera views on each point.  The program will automatically ignore any camera view that does not see the point.  It will automatically pickup the point again, when it is back in view.
The second factor is the number of calibration points.  I use 16 points.  From experience, the more points, the better for automatic 3d.
The great news is that if your room is set up in the above manner, you will be able to do a complete gait in less than 5 minutes from the conclusion of the data recording phase.  Single or double force plate makes no difference for the 3d kinematics.  However, if you are doing force plate collection and 5-6 camera kinematic data collection simultaneously,  you will need a separate computer for each.  All video systems require a separate firewire card for each camera.
Best of luck, you cannot beat this system for accuracy, time to complete product or price.  Please feel free to contact me as needed.
Bob Wainwright, P.T.
----- Original Message -----
From: "a.rahmatalla" <>
Sent: Tuesday, July 01, 2003 5:09 AM
Subject: APAS-XP


> Mr Bob Wainwright
> President, P.T.
> Kinematic Consultants
> Dear Mr Wainwright,
> Mr John Probe of Ariel Dynamics mentioned you as a user of APAS-XP. We use
> APAS system for more than 8 years in our Orthopaedic gait analysis research
> and we are quite happy with it. As you know, manual video handling and
> digitising are time consuming and with introduction of APAS-XP, it might be a
> good solution for such problem. My concern is our lab dimensions are 36 feet
> long and 20 feet wide and not quite sure if this space is sufficient for
> automatic video capturing. I also need your advice on the performance of
> APAS-XP such as synchronization, recognition of markers etc. At the moment I
> am using 6-JVC camcorders (9500) with 50 fr or 100 fr /sec. plus single AMTI
> forceplate but I am adding another plate soon. I am sorry to troubl you and
> many thanks in advance.
> Yours sincerely
> Dr Aziz Rahmatalla
> Director,
> Bionic Orthopaedic & Gait Lab
> Dept. Orthopaedic Surgery
> Keele University
> Staffordshire
> United Kingdom


I am just coming back from a conference outside of the country that’s why I am late to reply.

Yes we are using APAS system in our lab. For motion analysis system, this is the best system quality/price. There are very neat features and great service. 

I strongly recommend APAS system.


Mario Lamontagne PhD


University of Ottawa

School of Human Kinetics

125 University Street

Ottawa, Ontario


Tel: +1-613-562-5800 ext. 4258 or 4137

Fax: +1-613-562-5328



-----Original Message-----
From: Randy Goodman []
Sent: June 23, 2003 7:12 PM
Subject: question regardng ariel biomechanic system


Dear Dr. Lamontagne,


I am a sport sphysiotherapist who has a group of clinics in the Kelowna area of BC and am in the process of purchasing a biomechanical analysis system to help us work with athlete's and coaches in rehabilitation and performance improvement. Ariel has given me your name as a reference.


Most importantly, have you found the system valuable and easy to use in your school.  Is there a fair amount of research being done with these systems.  How many camera's do you recommend.  Finnally, i work with elite level figure skaters and Freestyle skiers,  is the system portable to take on the ice or on the hill?


Thank you for your time.




Randy Goodman
Pinnacle Sports Physiotherapy Centers




Hi Gideon & John,
today I demonstrated the capabilities of the APAS to a group at Rose
Hulman Engineering School. They are exploring the possibility of
getting a motion analysis for their applied biology/biomedical 
graduate program. They started looking at a Peak system and went into
sticker shock. I shown the APAS and  gave them your web site and name
and number to see about a system for their school. This place is 4
miles away from me and the #1 rated private engineering school in the
country. It would be a good placement, maybe you would be able to
work out a good deal with some workstations. I think they are going
to bring more people back because they couldn't believe what it could
do and that there were multiple systems at a local state university.
Talk to you later.

Dear Gideon and John,
Yes,  You guys are the greatest!  You have the best customer service of any company I've ever dealt with. Thank you so much. 
You have found the exact file I was looking for!  Thank you so much.  I'll let you know what comes out of it.
And Gideon the things I learned in six months at Coto have undoubtedly helped hundreds maybe thousands of my students.  Including my 7 time National Champion with her serve and forehand.
Best Wishes,
Jim Shaughnessy
Sent: Wednesday, August 14, 2002 4:15 PM
Subject: Re: 3d database

From:      Self <SCIFAC/PMFINCH>
To:       "Southard, Dan" <>
Subject:    RE: 3-d system
Date:      Mon, 22 Oct 2001 13:19:08 -0500

Hi Dan,
I compared the Peak versus Ariel APAS systems when I investigated the
purchase of my first motion analysis systems. The Ariel system
permits the use of off- the- shelf hardware and cameras where the
Peak system tries to have you purchase equipment from them with a
markup. The computers,capturing VCRs for the Peak are standard units
but have been configured to be proprietary therefore the complete
system has to be purchased from Peak.The versatility of the Ariel
system for class use and multimedia applications with athletes has
been great, and I have not used the Peak for these applications.
The paper by Jim Richards at Delaware that , Gideon Ariel
references on his web site does a very good job comparing the
accuracy of numerous systems and Jim does not own an Ariel system but
he has a Motion analysis system.Also, check to see if there is a
service contract necessary to ask any technical questions in the
coming years after the equipment purchase, some have
service/technical support maintenance contracts. If you compare the
accuracy provided by the systems, the technical support, and price I
think you will be very hard pressed to find a better value for the
best reported accuracy.
As I said before the people at Ariel Dynamics have been very
responsive to any of my needs or questions.I have been very pleased
with my purchases of the different systems.
Let me know if there are any other questions.
Al Finch


Dear Claire,

Before you buy either the MA or Vicon systems make sure you have a look at
the APAS system.

It is much less expensive, user friendly, and better in my opinion.  I am
not up to date with the latest systems of Motion Analysis and Vicon but I
find that the APAS system is very versatile in offering high speed data
capture (240 HZ) at low prices, error free digitising with the capability
of mixing automatic and manual digitising and with digitising black not
just bright spots.  This saves an enormous amount of time with trying to
get exactly the right lighting enviroment for automatic digitising and
having the endless frustrations of trying to get 'clean' 3D data of
numerous markers.  We have just used the APAS system to collect data on
golf puts using specatators at the British Open.  We were outside in
bright sunshine and collected data at 240 Hz from 2000 subjects.  We are
now happily digisiting that data automatically on the APAS system.  For
this project I needed to export the data to run my own Fortran programs on
it.  This was easy to do on the APAS system.

I am normally a believer in 'you get what you pay for'.  This is an
exception.  You get better for much less with the APAS system for several
reasons.  1.  Gideon Ariel has the ability and drive to develop everything
himself and uses only a small support staff.  2.  He does this part of his
business because he loves biomechanics - he is extremely wealthy from
other business ventures  and does not rely on this side of his business to
make vast sums of money.

I have not seen the lastest versions of Vicon and MA.  However, I have had
experiences with MA and did not stop throwing money at expensive upgrades
etc.  In the three years I was at Perth we didn't have one study published
from the Motion Analysis system  and despite the time and money that was
thrown at it, the system didn't ever work in a friendly way. It kept
seizing up, was unfriendly for downloading data for other programs, had to
be used indoors in highly controlled lighting environements and, even
then, there was so much time spent in trying to get clean continuous paths
and interpolating excessively that we would have been better off
digitising manually (if it had given us that option). Their newer system,
which I think is Window's based, may be much better (it would certainly
need to be). What you should be aware of though, is that the service was
extremely slow, they passed the buck from one staff member to another, and
their solution to any problem was generally an expensive upgrade rather
than providing technical assistance.  In contrast,  whenever I need
clarification of anything on the APAS system I e-mail Gideon directly. The
reply is always within one day and often within the first hour of sending
the message. 

Claire, I have no vested insterest in the APAS system and have taken the
time to write to you for two reasons:

1.  I am grateful to Gideon for his concern for individuals and the growth
of biomechancis rather than simply making large amounts of money.

2.  As the current President of the ISBS I am eager to see an increase in
the volume of biomechanics research.  Progress is currently thwarted by
uneccessarily expensive systems that prevent many people from contributing
to the science.  The APAS system has brought analysis within the reach of
ordinary departments and individuals.  If one has a reasonable budget, the
saving on video analysis equipment can be used towards other equipment
such as force plates and EMG etc (by the way, Gideon has an analogue
module that integrates nicely with the video system).  You could have a
much more versatile, friendly, and complete system for less than you will
pay for a Vicon or MA system. Further, you can get a site license for
little extra cost and have your students, even at undergraduate level,
doing some real research on a powerful and friendly system.

I too was sceptical of the offers made by the Ariel company.  In fact,
when I hosted the 1999 ISBS conference in Perth I initially rejected
Gideon's offer to give delegates free Ariel software.  As I got to know
Gideon I realised that he is genuine in his desire to facilitate
biomechanics research.  If I was not convinced of this I would not be
risking my reputation as the President of the ISBS. 

I strongly suggest that you have a look at the APAS system before spending
excessively and unecessarily on either the MA or Vicon systems.



Professor Ross Sanders PhD
Chair of Sport Science
Department of Physical Education Sport and Leisure Studies
Moray House Institute of Education
The University of Edinburgh
Cramond Road North
Edinburgh EH4 6JD

Telephone  (+44) 131 312 6001 ext 208 or 212
Fax (+44) 131 312 6335


From:      Self <SCIFAC/PMFINCH>
To:       D.
Subject:    Re: 3-d system
Date:      Sun, 21 Oct 2001 16:42:13 -0500

Hi Dan,
I am Al Finch at Indiana State University and I have had an Ariel
APAS since 1990. Presently, I have 2 desktop APAS collection units
for video, force plate, & EMG, 4 APAS laptops which can collect EMG,
Video, and force platform data and 6 APAS workstations.I use VHS,
SHVS, HI8, and the JVC digital video cameras  for my video analysis
of numerous movement applications. I have used the panning, the
DELTA, and the kinetic module also on research projects, in addition
to the basic video, force plate,APASview, RENDERER, and EMG analysis
modules. I find the system very accurate, flexible and easy to use in
a student environmentI have  used it to analyze data from the  1996 
Atlanta Olympics, the 2000 Olympic trials and the 2001 USA track &
Field championships.With the system I am able to perform the video
analysis of the hurdling performances right on site during the
compeition for the USATF Elite Hurdling development group that I
work with.The accuracy of the system and a comparison of the APAS to
other systems was reported by Dr. James Richards from Delaware at the
3D conference in Tennessee in 1999.Also, the price is unbelievably
reasonable when compared to its competitors units and when closely
examining the innovations that this system has. I wouldn't hesitate
recommending this system to anyone and the bottom line would be that
I would buy the system again and I have many times.John Probe in
technical support is always helpful in resolving any questions
software and hardware and there is no annual service contract to have
this technical support unlike other manufacturers.
If you have any further questions please feel free to contact me by
phone 812-237-3927 or email.
Al Finch,Ph.D.
Biomechanics Lab Director
Professor Physical Education

From:      Al Finch
To:       swyang@BME.YM.EDU.TW
Subject:    Re: motion analysis by video capture system
Date:      Thu, 10 Aug 2000 23:29:10

Dear Dr. Yang
In our Biomechanics lab we have 4 APAS data collection units and 6
APAS workstations. One of the data collection systems is a laptop
version of the APAS. I have collected simultaneous video from 5
cameras (it is capable of using 9 camrea views), a Kistler force
plate and 4 channels of EMG using a Motion control EMG electrodes and
a synchronization microswitch which illuminated a  LED for camera
synchronization and it also produced a square wave voltage into the
analog board to align the EMG and force plate data. The systems are
very effective,  versatile, and reasonably priced. The video based
results are very accurate and an independent study presented at the
3D video conference at Tennessee in 1998, compared the APAS system's
accuracy to Peak, Viacom and Motion analysis and it was found to be
very accurate.  The autodigitizing mode for the video analysis is
very quick provided there is reasonable contrast between the markers
and the background.  I have used the systems to analyze controlled
laboratory projects and open ended projects at the 1996 Olympics and
2000 Olympic trials and they worked great regardless of the control
that I had over the filming conditions.
I highly recommend the system and I wish you well in your comparisons
of the different systems.
Al Finch,Ph.D.
Biomechanics Lab
Indiana State University

I am a happy user of the Ariel System.  I do not work for them, but know their
system pretty well.  I met Gideon Ariel when I was a Research Fellow at MIT in

I am a bit of a smart aleck, but I would love to have the $$ you will spend on
one of the systems you mentioned, buy the APAS, train your people to use it, and
stay in residence for a few weeks, teach a course for you . . . . and I would
still come home with quite a handy profit.

Feel free to e-mail or call if you would like some further information.

Leonard Elbaum

Clare E Milner wrote:

> Hello All
> We are currently in the process of purchasing a 3d motion capture system and
> have narrowed our choice down to either Vicon or Motion Analysis.
> We have fully researched the technical aspects of both systems, but would be
> interested in contacting current users directly to discuss in confidence
> their practical experiences of working with the systems on a daily basis.
> If you are a current user of either system and would be willing to share
> your experiences with us, please reply directly to the email address below.
> Thanks in advance
> Clare Milner
> ________________________
> Clare E Milner PhD
> Post Doctoral Research Fellow
> The Centre for Sport and Exercise Science
> Sheffield Hallam University
> Collegiate Hall
> Sheffield
> S10 2BP
> Great Britain
> Email:
> ---------------------------------------------------------------
> To unsubscribe send SIGNOFF BIOMCH-L to
> For information and archives:
> ---------------------------------------------------------------

From:      Self <SCIFAC/PMFINCH>
To:       "Ken Alford" <>
Subject:    Re: APAS biomechanics system
Date:      Tue, 13 Feb 2001 11:51:11 -0500

Dear Dr. Alford
I started with my first Ariel APAS desktop system in 1990. That
system had the force plate, EMG, 3D video analysis, DELTA, and VRG
options. It still is a very functional unit in my lab although the
computer is starting to get a little slow by today's standards. Since
that time I have acquired another APAS desktop data collection unit
with the Computerized Exercise System (CES), that runs everything, 2
Ariel laptops and 6 Ariel APAS workstations.I have just ordered to
laptop To complement these units I just was able to purchase a
dedicated media projection system in the lab so I can turn the system
into a 20 ft oscilliscope to class demonstrations. The system has
been easy to maintain and only occasionally, the instability of
Windows will make it necessary to adjust the autoexec startup file.I
use Panasonic VHS, Sony Hi8mm, and JVC  9500 digital cameras for the
video analysis. The APASview and RENDERER software are tremendous for
illustrating visual analysis techiques. I am presently working on a
paper highlighting those features for the National TEaching of
Biomechanics conference in San Francisco this year.  Undergraduate
and graduate students seem to learn how to use the basic analysis
system quite easily and then they start exploring all the special
application features.The APAS system's  ability to process data had
made it possible to conduct 3-5 research projects that are of a
national or international scope rather than my 1-2 projects every 1-2
years prior to the acquisition of the  Ariel APAS depending on the
nature of the study.
John Probe and Stan in technical support have been great to work with
and they can solve the problem either over the phone or through a
modem to the computer.
I am very pleased with my Ariel systems and when you compare the
functions, accuracy,flexibility and price of the Ariel to other
systems, Peak and others you'll will find no user service fees and a
great system at a great price.
Please feel free to contact me if you have any questions.
Al Finch,Ph.D
Professor Biomechanics
Indiana State University
Physical Education Dept
tel# 812-237-3927

  I have been using the APAS system for several years now and have been
extremely happy with it. I used it for my PhD dissertation which involved a
3D video analysis of wheelchair basketball shooting during competition. The
system did a great job of working with the data of which I collected over
700 trials.  As a faculty member here at Virginia Commonwealth University,
I acquired the newest version of APAS and have started several projects
using video, force plate and EMG. I have had students in the lab all summer
working on mini-projects and will put together lab activities for the
regular semester. The system is rather straightforward and Ariel Dynamics
provides good technical support. My queries are always responded to very
quickly and efficiently. I highly recommend the system, it sounds like it
will be very suitable for your needs.
>Don't hesitate to contact me if you have any questions.
>Laurie Malone

Laurie A. Malone, PhD
Virginia Commonwealth University
Division of Health, Physical Education &  Recreation
817 W. Franklin St., P.O. Box 842037
Richmond, VA 23284-2037, USA

Phone:  (804) 828-1948      Fax:  (804) 828-1946

To:       "Saiwei Yang" <>
Subject:    Re: the APAS system
Date:      Wed, 30 Aug 2000 10:16:12 -0500

Dear Dr. Yang,
I have been able to analyze most 3D movements using 2 or 3 cameras. I
use more cameras when the movement is very complex or when there are
obstructions for viewing which makes it necessary to have extra
camera views. The APAS system software will permit utilization of up
to 9 cameras.
I have used simlutaneously EMG, force plate, microswitch
synchronizing event marker, and kinematic/kinetic analysis of  video.
Normally you can synchronize the video information and a foot step on
the force plate by visually inspecting the video records
providing  the accuracy of the video sampling rate.The EMG/analog
synchronization with video/force plate normally needs an electrical
event source which provides a square wave that is less than+- 10
volts to the analog box.The APAS software will simply do the rest of
the synchronization and time alignment.The JVC digital cameras take
great pictures at a fast field rate for a very reasonable price, I
presently have 3 Panasonic VHS camcorders, 1 Sony Hi8 camcorder and 2
JVC 9500 cameras (120 fps) and I can use them all on the same project
if neecessary.
To collect force plate data you will need the A/D analog board with
either the 16 or 32 channel junction box and also you will need to
purchase the analog software. Also, you will need to purchase the EMG
electrodes for the number of muscles that you wish to monitor. You
can connect an existing force plate, or you can purchase force plates
from Ariel Dynamics. The system works with Bertec,AMTI and Kistler. I
have a Kistler plate working with my system that I had purchased in
1984 prior to owning my first APAS and it interfaced with no
problems. I would recommend the Renderer software for
visual illustrations and the APASview software for the integration of
multiple video views, 3D stick figures, kinematic/kinetic data in
numerical and graphical formats, and EMG/force plate data.The
APASview is great synchronize all your data from video, EMG and force
plates and extract the exact numerical values while seeing the visual
of the movement.The digitizing of video records is very accurate and
quick whether you are using markers and autodigitizing or manual
digitizing the movement where markers were not permitted.
I have no experience with the SIMI system and I have seen the Motion
Analysis system in action but with that unit you have to have the
markers afixed to the subject, the receivers have carefully placed,
and when you are finished you have no video record of the movement to
view and it is quite expensive.
I have been very satisfied with my APAS systems, my interactions with
Ariel Dynamics, and the technical support provided from John Probe 
at Ariel Dynamics.
If you have any other questions on the APAS systems or the different
applications that I have used the APAS for please feel free to
contact me.
Al Finch,Ph.D
Biomechanics Lab
Indiana State University

David Mullineaux
Sport Division
Collegiate Crescent Campus
Sheffield Hallam University
S10 2BP
Tel 0114 225 4405
0114 225 2596 (to leave a message)
Fax 0114 225 2535

Dear Mr Mullineaux,

We, in the Orthopaedic Dept. of North Staff Hospital (Keele University), are using Apas system for over five years for both research and clinical gait and both kinetics and kinematics. Sheffield is only an hour drive from Stoke and you are welcomed to come and see the system at first hand. I personally like the system particularly for research purpose since you can disseminate and learn the principles of analysis in steps and observe/alter any errors that you encounter with. Please let know what you decide.


Yours sincerely

Dr Aziz Rahmatalla

Hartshill Orthopaedic, Bionic 

City General Hospital

Newcastle Road

Stoke on Trent  ST4 6QG  


Tel: 01782 552698 / 553762


Date:      Mon, 21 Aug 2000 16:56:16 -0500

Dear David,
I have 10 Ariel APAS systems in my laboratory office area, in
addition to an APAS laptop and a desktop system at home.I have 2
desktop collection units for collecting video, force plate data and
EMG simultaneously. In a laboratory setup and at the 1996 Olympics, I
have used as many as 5 camera views (its capability is 9 cameras).
The APAS is easy to teach how to use in a student environment (BS and
Masters) and yet it is very accurate (see the report presented at the
1998  3D video at Tennessee. Its video digitzing works great and is
very fast whether it is autodigitizing or manual. The video display
functions using the Digi4, APASview and render are fanatastic for
preparing visual illustrations or research technical reports. The
systems are very reasonably priced and the additional workstation
options are great to build a multiple site student laboratory with
limited money.If you check on Ariel's websight you can see some of
the variety of projects that I have used the APAS on.
I highly recommend it. 
Technical support with John Probe from Ariel Dynamics has always been
a phone call or email away.
Al Finch
Biomechanics Laboratory
Indiana State University
tel 812-237-3927
fax 812-237-4338

Dear David
I have been using APAS since 1985.  We do Kinematic Functional Capacity
Evaluations for Workers Compensation Issues.  It is an excellent
system, easy to learn and easy to digitize.  You can use white markers
or black mark.  Therefore, under proper lighting conditions, you can
also digitize outdoor events automatically.  I have digitized many
sports events manually as well.  Of course, during competition, you
cannot place markers on the competitors.  We integrate force plate
data, EMG data and event markers with the kinematic data.  Dr. Ariel and
staff are always receptive to new ideas and very helpful with problems.
I have never had a software that has not been solved by e-mail or phone
consultation.  New software updates are free as internet downloads.

I refer you to the same basic question and answers concerning a
comparision of APAS vs. other systems.  I do not believe SIMI was an
option at this date.


Please feel free to contact me directly with any further questions.
Good luck with your projects.
Robert Wainwright, P.T.
Director, Kinematic Consultants, Inc.

Hi John    3-30-00

Just wanted to send a quick email and thank you and Gideon for your
cooperation and help.

I have tried my notebook and it works well. I am looking forward to providing
evaluations in my Sommerset office the first week of April.

I like the system and working with the medical application that Bob has
programmed. I'm sure using Bob's ideas there are other applications for the
APAS system.

Again Many Thanks
Charlie Filippone PT OCS <>

Thanks for the courtesy, and the advice re: upgrade.  Maybe we can upgrade just
before the course this summer.

In the meantime, FYI, I've got a student doing a neat project  . . one only your
system could allow for. She is studying the short term effects of electric
stimulation on spasticity in children with CP.  A simple 2-D study .. . but she
can capture video in her clinic.  I lent her a calibration frame and some
reflective markers.

She brought in her first video earlier today . . . captured it with the iomega,
trimmed, digitized, filtered, and displayed side view of ankle and foot, before
and after treatment.  Took less than 20 minutes.  She is tickled, and so am I.

So, thanks again. . . .


Leonard Elbaum

Gideon and John,
Thanks for this improvement in the software. This is what I call a reliable company.
Gideon, I did not forget you I am sending a good bottle of wine from italy. I was in Sweden last week with Andrew Cresswell who you know.


Mario Lamontagne PhD
Full Professor
School of Human Kinetics
Biomechanics of Hockey Laboratory
University of Ottawa
125 University Street (MNT341)
Ottawa, On
Canada  K1N 6N5
Tel: +1-613-562-5800 ext. 4258 or 4137
Fax: +1-613-562-5328 or +1-613-562-5149


. I will  recomend your system to any one who asks me, as I believe it to be both very accurate and
extremely user friendly (my undergraduates are talking no more
than 1.5 hours to master the system completely for some quite
complex stuff) and I hope you get many more sales from it.
Thank you once again for your help and advice. If you have any
ideas on future collaboration then I am all ears.


Dr Jim Richards
Lecturer in Biomechanics
University of Salford

Hello Dr. Ariel,

I would like to introduce myself; my name is Elie Basch and I am a
graduate student with Dr. Doris Miller at the University of Western
Ontario.  I am writing to you regarding your APAS motion analysis
system.  In my short time as a graduate student, APAS has become an
essential resource.  It is a magnificent teaching aid for when I help
instruct undergraduate classes, as well as being excellent for my own
kinematic research.  APAS has enabled biomechanics at Western to be on the
cutting edge.  I just wish I had exposure to your software when I was an
undergraduate.  The students here are very lucky to have an advanced
motion analysis system at their disposal, and this would not be possible
without your generosity.   

I look forward to keeping in touch with you.

Thank you for all that you have done for us.

Elie Basch

Elie Basch
M.Sc. Biomechanics Candidate
University of Western Ontario
School of Kinesiology
3M Centre Room 2230
London, Ontario, Canada N6A 3K7
(519) 661-2111 x88360 or x85770 (w)
(519) 661-2008 (fax)

Dear John,
I find the Ariel APAS software is very powerful, user friendly and
flexible for teaching movement analysis in Kinesiology and
Biomechanics. With the APASview/display function you can create sport
movement projects that show simultaneously the video, 2 or 3-D stick
figure and the qualitative data in graphical or tabular form.
These are great for teaching sport classes, also. From your captured
avi files from the Sony digital camera you could digitize and then
analyze the data. The software works on a PC platform but I think you
would be able to use the avi files from the mac.You could download
the APAS software for a free trial period and then later pay  for the software.To download, check
out the web page /
Feel to contact me  if you have any questions.
Al Finch
Indiana State University

Hi Gideon        10-27-99
It was good to see you at ASB.

Many thanks for the APAS software that we have installed in our student
lab and for forwarding the site codes on such short notice. We have now
done two of the four lab groups this week and it is great to have the
students together in one room and all working at about the same point. Your
new software makes the digitizing much faster and I particularly like your
approach to filtering.
   Again thanks for revolutionizing the digitizing process for instruction
and research. We will send you the instructions Aleksandra has developed
for the students. They are able to follow these instructions and get
through the whole process. My motto for the lab is "Before all else fails,
read the instructions!"

Could I impose upon your good nature for one more site key? The site code
is DF1B 12B6 7F72 393D 02.

Best regards,


Doris I. Miller Ph.D.
School of Kinesiology, 2142 Thames Hall,University of Western Ontario
London, Ontario, CANADA  N6A 3K7  (519) 661-2111 X88360 (w)   (519) 661-2008 (FAX)

Hello Gideon, hope all is well.

A few interesting things.  Thanks  to you and Ken, I have
connected with Vicki Dugger in Tennesee.  I have helped her with a
couple of reports.  Better motivation for getting the course off the ground we have spoken about.
I'm still hoping for completion by next summer.

Second, the Dugger opportunity has allowed me to get into your software
but, having said that, what a friggin great piece of software you have
put together!  I simply cannot think of anything which I cannot get out
of it with a few keystrokes.  Not that your ego isn't big enough
already, but my hat is off to you.  Remeber, my ego is pretty big too,
so take the compliment seriously!

I still need some space and time to set up my AMTI, build a new
calibration cube, purchase the delsys stuff, and create some really neat
models with force, emg, and kinematics, but I've got a great kid working
for me this semester . . . a chemistry major who loves digital video,
and things should pick up.

In the meantime, regards to John and Ken, and hope to talk / e-mail


Thought that Gideon might want to know that I have been using the APAS and multi-function machine to train for track and field after a long lay off.  Have already acheived Masters All-American honors in 5 events in my first meet, and will get 3 more in my next.  Have won three national championships, and finished first in the Scottish Highland Games breaking a national record in the stone throw.  The technology has been extremely helpful, and I am going to try to get the All-American Standard in every event in Track and Field.  By the way, you know I have the APAS, CES, EMG package, how much to update my system?

                                       Blake J. Surina

Dear Gideon/APAS Crew,

I am ot certain of whether you are aware of it, but I have had two recent publications concerning the accuracy of the ARIEL system of varying conditions:

Wilson, DJ, Smith BK, Gibson, JK (1997) Accuracy of reconstructed angular estimates obtained with the Ariel Performance Analysis System. Physical Therapy, 77,1741-1747.

Wilson,DJ et al. (1999).Accuracy of digitization using automated and manual methods. Physical Therapy, 79, 558-564.

These publications may be of interest to your users as each demonstrated outstanding accuracy by the ARIEL system under  difficult filming conditions.

My new address is:

Dr. Daniel Wilson

121C McDonald Arena

Southwest Missouri State University

Springfield, MO

I am currently trying to convince the administration that purchasing an APAS system is necessary!

See you soon,

Daniel Wilson, Ph.D.


Return-Path: <>
Date: Wed, 18 Nov 1998 09:19:43 -0500
To: Ariel <>
From: (Normand Teasdale)
Subject: up and running!

Dear John and Gideon;

Payment for the markers was issued on October 29. You should have received it by now.

I am now up and running! As I said my first project was a 2-D project. We have started the project and so far so good. We're learning more about the system everyday and we enjoy what we see! I have validated APAS with my Selspot system. If you ever need some specific data I could certainly pump up some specific validity measures. In this specific case, we have used the active markers of the Selspot for comparing Selspot and APAS data. Here is my question regarding the calibration of APAS for 2D measures. For a lot experiments, 2D measures can be sufficient. For our initial tests, we have used a frame with 4 markers (1.5 m x 1.5 m, with markers at each corner). Do you know if adding markers improves the accuracy? if so, what is the best strategy in term of the number of markers and location of these markers?

Another calibration and markers question: I am in the process of preparing 2 sports related projects (skiing and figure skating). Obviously, collecting data for these tasks is much more complicated than for a controlled laboratory task. My question is not really specific, I am simply wondering if you have any particular suggestions with regard to the calibration procedures. I know about the procedures for synchronizing cameras. I am simply curious to know more about the ideal calibration frame, markers, lighting conditions. I know that Gideon has a lot of experience with sporting events (in fact, he probably has more experience than anybody on this planet!) and would simply like to cut on the trial and error process if I can. I know also about the panning module but this is not something I can afford right now (maybe next year!). Thanks in advance for any tips you will provide.

Finally, at one point you (Gideon) mentioned that I could install the programs on as many PCs as I want. I have no desire to infringe on APAS copyrights, here. In fact, in the short run you probably will gain some customers from my actual students and collaborators. For example, one of my goal is to develop and train national coaches to allow them to use all the power of an analytical tools like APAS (particularly in speed skating as I have close ties with the National Team, both coaches and athletes; I also have students that are involved at different levels in figure skating, skiing, and tennis). However, in the meantime the availability of only 1 PC (the other one being my own PC) for capturing, digitizing and processing all the data is going to be a strong limitation of the system. I would have no problem if you could allow us to have only some of the modules on ''dedicated-processing workstations'' (for example, workstations on which only digitizing, filtering, and datadispl
ay would work but not realcapture). Anyway, those are suggestions, I would really appreciate if you could provide me with a clear answer on this issue as it will influence my way of organizing some of the projects (both, research and academic) I intend to develop in the near future. Again, I will never allow someone to copy any of the software and to use it outside my lab. Maybe a ''hardware plug'' for the realcap module could allow some possibilities like that?

Thanks in advance for all the answers.
Best Regards,


Normand Teasdale (
Universit Laval, Laboratoire de performance motrice humaine, PEPS
Facult de mdecine
Dpartement de mdecine sociale et prventive
division de Kinsiologie
Qubec, Qubec G1K 7P4
Tl: (418) 656-2147
Fax: (418) 656-2441

Hi Peter:
You must install the software and drivers for the Buz before you instal the card in the computer. Did you know that?
I am very happy that the system working well
Hope to hear from you
Gideon Ariel

At 11:55 AM 11/24/98, you wrote:
>At 08:48 PM 22/11/98 -0800, you wrote:
>>Hi Peter:
>> The code is: F149 E5E1 0B07 6E49 8E01 9EFB D7
>> Let me know if everything is working
>Thank you very much. Everything is working very well (except the video
>capture, which is, I believe, our problem for not installing the Buzz
>drivers properly). I have run the rest of the programs using existing PCX
>files and they work very well.
>I am particularly pleased with the changes to the new version. Moving the
>mouse up to the frame advance button during digitising is a simple thing,
>but makes the process much more pleasant. Both the transformation and data
>viewing modules now work very well in 2D as you promised.
>Thanks again for your assistance.
>Peter Sinclair
>School of Exercise and Sport Science
>The University of Sydney
>East St E-mail:
>Lidcombe NSW 1825 Phone: 61 2 9351 9137
>Australia Fax: 61 2 9351 9204

From: (Sun G. Chung)
To: "Gideon Ariel" <>
Subject: About APAS98
Date: Fri, 4 Dec 1998 18:30:40 +0900
X-MSMail-Priority: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2106.4
X-MIME-Autoconverted: from base64 to 8bit by id EAA28214

Hello Dr. Ariel:

I downloaded and installed the APAS98lite to find it has more convenient user interface. I ran the digitize, transformation, filter, trimming modules for my study to validate the joint coordinate system of Grood and Suntay which is utilized in almost all of the commercialized gait analysis system including APAS, Vicon and others.

. As I stated earlier that I started to utilize the APAS98lite for my research, I would like to pay for the software.

I heard from Dr. Lee(Seong Jae Lee) in DanKook University that he has upgraded the APAS98lite.

How about applying me the similar condition to upgrade the APAS98Lite?
Or if I pay more than his upgrade, would it be possible to pay in divided amount for a certain period(by installment)?
Can it be possible to run APAS98 in more than one computer?

Waiting for your reply...

from Sun in Korea.

Thank you for your patience. SURPRISE .....SURPRISE. I think Iv'e got it. I
was doing some looking around and this program goes BEYOND my wildest
expectations. WOW I have not done a lot and I need to learn more about how to
use it. So I will be back on your site to do some reading. It is MARVELOUS
If it is alright with you I would like to get back to you later if I have any
more questions but I think I'm going to  be OK.
Thank you VERY much.
Glenn Amundsen


Hi, Dr. Ariel,

I downloaded the ver 3.0. Actually I did not run it but I will. It surely is be a pleasant job.

Now, I got the c3d files from vicon of our hospital(amputee gait analysis) and viewed the datas by readc3d.m.
A surprising thing is that almost all session(*.c3d) has lost data about 20 or more frames during 200 or 300 frames. I do not know how they can deal with the lost data frames. The lost frames seems to be too long to interpolate!!!

Did you hear about this problem in Vicon?


N:Chung;Sun G.
FN:Sun G. Chung

I am already amazed by this Iand I have only scratched the surface. I watched
the Discus .1t and I just about went through the roof. Then I brougt in an
.avi of Wolfgang and was litererally screaming at 2:00 am, waking the house
hold and some of the neighbors. I am so excited I can hardly wait to get up in
the morning and get on my computer. I may not break any world records with my
athletes but we will go after some school and State Meet records.
Thanks again for your kind patience and wonderful program.
Glenn Amundsen <>

I finished my doctorate in Physical Therapy from Texas Woman's University,
Houston, Texas.  In my dissertation I used APAS to quantify and analyse motion
of three groups (LBP without surgery, LBP with spinal Fusion and Pain freeindividuals).

I would like to send my sincere thanks to Ariel producers, and to ask about
users of the APAS in the Middle East Region. I'll be moving to Egypt and I'll
be teaching in The Faculty of Physical Therapy  in Cairo University.

Currently I don't have enough fund to purchase APAS system. However, it is one
of my plane during next year.

If you please send me more information about users of APAS in EGYPT or around

Hamdy Radwan, Ph.D PT
11415 Graywood Dr.
Houston, TX 77089

Hi Sun:
  Was nice to hear from you. This is the way to go. Digitize automatically
while doing other tasks. We are going to have a new automatic digitizing
soon that will blew your mind.

-----Original Message-----
From: Sun G. Chung <>
To: Gideon Ariel <>
Date: Wednesday, April 14, 1999 8:25 AM
Subject: Re: Received the markers

>Hi  Dr. Ariel,
>You wrote great deal of work. I did not read the tutorial throughly, but
for a new user it would be a great help with kind multimedia. Now, 0:28 am in
>Seoul, I am writing to you email, while the digi32 of this notebook is
>digitizing an avi automatically.
>Have a nice day!

>Return-Path: <>
>From: "Darren Cruse" <>
>To: "Erik B. Simonsen" <>
>Subject: Re: Hello + some questions
>Date: Fri, 30 Apr 1999 09:20:28 -0500
>X-Msmail-Priority: Normal
>X-Mimeole: Produced By Microsoft MimeOLE V4.72.2106.4
>>Hello Darren,
>>You really sound like a newcommer to biomechanics (no offense).
>None taken.  I'm definitely a newcomer big time. :)
>>Why dont you
>>take a look at the APAS-system, which a lot of people use. It is low priced
>>but very accurate and reliable, the latter has recently been proven
>Thanks.  Others on the list suggested the APAS system as well so I am
>definitely going to look into it.  The other system mentioned was something
>called HU-M-A-N or something.
>>It is not an on-line system, but it may be as fast due to
>>online problems with confusion of markers etc.
>Wow that is the most interesting part of your comment to me - I had come to
>this realization about the need for data cleanup on my own (i.e. the Vicon
>salespeople hadn't really gone out of their way to emphasize it :), and it's
>been a learning experience to understand that it's largely part of the
>process and not something I was doing wrong.  But the thought that an
>inexpensive system could be fast enough to actually compare speed wise (in
>any way) is eye opening (I had looked at a plug-in for Max called
>KineCapture which the vendor told me would take hours just to convert
>relatively short sequences).
>I'll have to read more about it...
>Thanks again,
Erik B. Simonsen, Associate Professor, M.Sc. Ph.D.
Institute of Medical Anatomy section C.
Panum Institute. University of Copenhagen
Blegdamsvej 3., DK-2200 Copenhagen N
Phone:  +45 35 32 72 30 (work)  Fax: +45 35 32 72 17
Phone:  +45 45 80 93 04 (home)

Hi Ross,

Gideon Arial sent me some information regarding your concern about the APAS
system. I down loaded the APAS system and installed it on a number of PCs.
Gideon send me the registration numbers. Therefore, these program packages
are valid without time restriction. We started testing the system and did
not have any problems so far. Digitizing, calculating, and exporting the 3d
data worked without fail. Therefore, I have good reason to respect Gideon's
offer as being serious and honorable.

Best regards,


*  University of Konstanz
*  FG Sportwissenschaft
*  Dr. Manfred Vieten
*  P.O. Box 5560 D 30
*  D-78434 Konstanz / Germany
*  Tel.: +49-7531-88-3565
*  Fax.: +49-7531-88-3026
*  E-mail:


Great news about the deal on tickets.  However, there will be very
little time to look at our system given that the data smoohting
workshop starts on the 29th.  Although I guess we can be looking
at it while that is in progress. 

Hey, I have had word back from Motion Analysis.  They indicate
that to upgrade to Windows I need more hardware.  I need your
advice on this.  I think I'll tell them not ot bother and we'll see how
functional our system is after you've been here and had a look.  We
have had this blloody thing for three years and keep throwing more
and more money at it and it still doesn't work effectively.  We
haven't had one publication come out of it yet. This is partly
because I am still using data that I brought from Otago and have a
research backlog to clear.  But still, I am starting to wonder where
this spending money for no return will end.

I think if we just use it for data collection (a front end) it will be OK
and we will use Ariel software for analysis.  In any case Ariel
Dynamics will get the kudos not those useless pricks.

Here is the message from Dan India.

You have a 6 camera 60/120 HiRES system operating off a Sun
Sparc card with
in the Midas Box.  32 channels of A/D

1)  And you want to move it to the PC Midas Box correct?  2) The
Midas runs
NT but nothing else is loaded on to the Midas, its sole purpose is

3) A PC NT is then networked to the Midas NT system for data

4)  KinTrak is still on the Unix and due out in PC come August, 
Due you use

5) Do you want to upgrade to Falcon Cameras?  60/240Hz

6) Then with Falcon's I would suggest New Phase Lock Looping
Digital VPATs

7) and if 6 and 7 are optioned then I would revisit item 3 and highly
suggest an Intergraph Dual Processing NT so that you can run
pure Real Time
EVa:  Three Frame Delay from Capture to Stick figure on screen.

8) 240 Hz Resolution Monitor:

Ross:  this will not be a "low cost upgrade" but I am willing to give
it a

Pure Speculation:  Maximum US Dollars Based upon current

1) Midas Box upgrade to NT:    $6,500  A little play here
2) Dual Processing Intergraph Computer:  $9,000 -10,000  If you
can pruchase
Locally with Humingbird Software Do it!
3) Falcon cameras and VPAT's $18,000 each less $9,000 ea Trade
in of 120 and
Version 2 VPATs:   I can do better!
4) 240Hz Monitor:       $3,000   Not much room here

To Start with the Midas Box to NT:  I will seek a $ before I leave for
Standard NT computer with Humingbird / Exceed Software will run
$4,500 -
Items 3 and 4 wait for later.

Ross:  I was creative for Barry once before, and I'll try to do it again.


Gideon,  are we being taken for a ride???

Would appreciate your coments
Catch you soon,


Send reply to:  "Gideon Ariel" <>
From:      "Gideon Ariel" <>
To:       <>
Copies to:    "Graeme A. Wood" <>
Subject:     ISBS
Date sent:    Thu, 20 May 1999 14:06:55 -0700

Ross H. Sanders PhD
Senior Lecturer
School of Biomedical and Sports Science
Edith Cowan University

Ph: +61 8 9400 5860
Fax: + 61 9400 5717

ISBS 99 Symposium June 30 to July 6, 1999

Check it out on the web through the ISBS home page at:

Hi Gideon,

Your comments to Ross are rather interesting. I think the the MAC people are
a bunch of assholes also.

I have no intentions of undercutting your efforts, hence I am making my
comments through you, for you to use as you see fit.
We have not actively marketed AMASS for some time, but it would take the
data directly from their MAC hardware and do all functions to get identified
3D data, with methods that are still state of the art. The cost would be
$3,000 to $4,000 depending on the support he needs. David Llyod runs AMASS
in Perth if Ross wanted a reference.


Dear Jack,
I read your note concerning the need to find a used Peak or an Ariel
APAS system. I am an Ariel system user and have been so for the past
10 years. Prior to my purchase I compared the Peak vs Airel system
for functions, ease of use, flexibility, ability to be easily and
cheaply upgraded, price, and accuracy of results. After evaluating
all the these items it was very easy to decide on Ariel APAS. The
system is tremendously powerful, the accuracy surpasses Peak as
reported in this year's 3-D conference, the APAS is a fraction of the
cost of the Peak, and the hardware is not proprietary as in Peak. 
The video analysis capabilities are great, the EMG and force plate
are fast and capable with many types of hardware. Presently in my lab
I have, 1 Ariel laptop with analog abilities,2 full APAS systems, a
CES, and 3 APAS workstations (the lastest has the Ariel APAS light
downloaded on a Dell p450 and a 25GB hard drive). At home I have
another laptop with EMG/force plate and another APAS workstation
that I use for industrial ergonomic consulting. I can interchange
data between all the systems in that every generation of machine has
been backward compatible. the systems are used in an undergraduate
and graduate environment and they have survived well. Any questions
or help are promptly taken care by John Probe over the modem or
phone. With the system I am averaging 4-10 projects a year compared
to 1-3 every 2 years. My research productivity has skyrocketed and
that has been accomplished while teaching 12 hours.
Its great! The value for the money is unbelievable and it is the best
purchase that I ever made in my lab.
If you have an further questions please feel free to contact me.
Al Finch,Ph.D
Professor Biomechanics
Indiana State University

Hi Jack
Why buy a any used system when you can purchase an APAS for a fraction of the
price.  APAS can do anything Peak can do and has many features, Peak does not.
I am using the system for 15 years and have build a great Medical Analysis
business around it.  You can integrate force plates, EMG and other voltage
output instruments.

If you want to discuss this with me, I would be happy to answer your questions.

Robert Wainwright, P.T.
Kinematic Consultants
Point Pleasant, NJ
732 714 1907

> > I am in the search for a used Peak Motus Motion Measurement System or
> > an Ariel System....If anyone is aware of one that  may be up for sale,
> > I would appreciate if you let me know.
> >
> > Thank you for yout attention
> >
> > Jack Sujovolsky, MS
> >
> > _________________________________________________________
> > Do You Yahoo!?
> > Get your free address at
> >
> > ---------------------------------------------------------------
> > To unsubscribe send SIGNOFF BIOMCH-L to
> > For information and archives:
> > ---------------------------------------------------------------
> >

Hi Jack
Of course it is automatic digitizing and 3d.  Kinematic analysis would never be
cost feasible or practical if it were not.  One problem with athletic analysis
is that  it is not automatic if you do it outside.  You cannot use markers.
That is universally true for all systems.  You should call me and discuss these
issues directly.  You can reach me at 732 714 1907.  I have a portable data
collection system as well as many stationary systems.  We have several remote
collection sites that we visit.

You can actually download a free 2 week version of the APAS at

Get the sample data also.  There are a lot of athletic files.

I would be happy to talk to you reach NJ.  When will that be?

Talk to you soon.

Jack Sujovolsky wrote:

> Dear Robert
> Thank you for your reply....
> I am interested mainly in 3-D analysis of athletes and or patients.
> Does the APAS system have automatic digitization? The reason I ask is
> that I am in the process of writing a proposal to open a mobile lab,
> and would not be efective for me to spend hours digitizing....
> Another issue is that I have been contemplating moving to NJ, and would
> like to have you consider me for possible employment with your firm.
> I graduated in 1997 with a Masters in Phys Ed and Eercise Science with
> specialization in Biomechanics from Michigan State U.
> I went to college at Jersey City State College...If you deem
> appropriate, I can email you my Word file resume..
> Thank you again
> Jack
> --- Robert Wainwright  wrote:
> > Hi Jack
> > Why buy a any used system when you can purchase an
> > APAS for a fraction of the
> > price.  APAS can do anything Peak can do and has
> > many features, Peak does not.
> > I am using the system for 15 years and have build a
> > great Medical Analysis
> > business around it.  You can integrate force plates,
> > EMG and other voltage
> > output instruments.
> >
> > If you want to discuss this with me, I would be
> > happy to answer your questions.
> >
> > Robert Wainwright, P.T.
> > Kinematic Consultants
> > Point Pleasant, NJ
> > 732 714 1907
> >
> >
> >

Gideon Ariel wrote:

> Hi Bob:
>  Thank you
> Gideon
> ----- Original Message -----
> From: Robert Wainwright <>
> To: ariel1 at netcom <>
> Sent: Thursday, June 24, 1999 6:34 AM
> Subject: Re: Fw: Used Peak Motus System
> > Hi Gideon
> > Her is my message to Jack, already send directly.
> > Bob
> >
> > copy:
> > Hi Jack
> > Why buy a any used system when you can purchase an APAS for a fraction of
> the
> > price.  APAS can do anything Peak can do and has many features, Peak does
> not.
> > I am using the system for 15 years and have build a great Medical Analysis
> > business around it.  You can integrate force plates, EMG and other voltage
> > output instruments.
> >
> > If you want to discuss this with me, I would be happy to answer your
> questions.
> >
> > Robert Wainwright, P.T.
> > Kinematic Consultants
> > Point Pleasant, NJ
> > 732 714 1907
> >
> > ariel1 at netcom wrote:
> >
> > > Hi my friends:
> > >  Could you write to this guy and tell him why the APAS is superior to
> Peak.
> > >  I really would appriciate it.
> > > Gideon
> > >
> > > ----- Original Message -----
> > > From: Jack Sujovolsky <puchadigo@YAHOO.COM>
> > > Newsgroups: bit.listserv.biomch-l
> > > Sent: Wednesday, June 23, 1999 3:56 PM
> > > Subject: Used Peak Motus System
> > >
> > > > I am in the search for a used Peak Motus Motion Measurement System or
> > > > an Ariel System....If anyone is aware of one that  may be up for sale,
> > > > I would appreciate if you let me know.
> > > >
> > > > Thank you for yout attention
> > > >
> > > > Jack Sujovolsky, MS
> > > >
> > > > _________________________________________________________
> > > > Do You Yahoo!?
> > > > Get your free address at
> > > >
> > > > ---------------------------------------------------------------
> > > > To unsubscribe send SIGNOFF BIOMCH-L to
> > > > For information and archives:
> > > > ---------------------------------------------------------------
> > > >
> >
> >

----- Original Message -----

From: Sun G. Chung <>

To: Gideon Ariel <>

Sent: Thursday, June 24, 1999 9:45 PM

Subject: Would you visit my ftp?

> Hello Dr. Ariel,
> How are you doing? Are you there in Australia?
> I am so happy with APAS99. We analyze about 4 to 5 patients a week since 3
> weeks ago. I developed mat lab scripters and functions to calculate and
> display joint angle(by Euler/Cardan angle of Grood and Suntay) from APAS 3d
> file. It was very hard work for me. But was inevitable to do that work for
> our patients.
> You may download the matlab tool and patient case from my ftp site as below.
>    Host address :
> Download the matlab tool and add path to your matlab. Then, run scripter
> "HHdisp" which means data display for Helen Heyes marker set. You may select
> 4 mat files, two for the patient data and 2 for normal data. Patient and
> normal data in mat file format are in the directory "gait cases" of my ftp.
> You can see the joint angles, COG pathway, angle and angle diagram.
> You can run "HHcal" to generate the mat files of joint angles and time
> distant values.
> The marker set and displaying format are same with Vicon and more. I have an
> idea to calculate the joint angles better than the Vicon clinical manager.
> Will do the work for " Beyond the Vicon".
> I would like to ask you some help.
> I like the apas2mat.m very much. Can you make an m file as "mat2apas" which
> can make an apas 3d and cf files from matlab matrix containg x,y,z data of
> several points in frames?
> During the processing of my HHcal.m(helen heyes calculation), I calculate
> the joint centers' x,y,z data. I would like to see animated stick figure of
> my joint center data in the apas view.
> Will you do that?
> Until now, I found that the digitizing capability of APAS99 is better than
> Vicon or Elite because we can see the patients with digitizing.

> Digital video cameras will make the APAS win the world in every aspect of
> motion analysis!!!
> Please, tell me after you download my gait case. The ftp site for me is
> limited upto 10Mbyes, so, I should delete them to upload another cases.
> Hope to hear from you....
> More than two of my Korean freinds(M.D. in rehabilitation medicine) will
> come to the ISBS in Australia. They - A man and a woman -  may give
> greetings to you because they met you in Korea, DanKook univ in 1994, when
> you gave a lecture for my alumni and Prof. Han.
> sun


----- Original Message -----

From: Erik B. Simonsen <>

To: Gideon Ariel <>

Sent: Thursday, July 15, 1999 5:10 AM

Subject: Re: where are you now?

> Hi Gideon,
 I was amazed how good the automatic digitizing
 module has become. I guess it must be because Jeremy had our AVI-files, the
 program seems to be tuned to our sequences. Several views were digitized
 almost completely without my interference - fantastic. Tine has told me
 several times that she is very satisfied with the program, but I didn't
 realize it was so good. Maybe you should travel with some of our AVI files
 to demonstrate the power of the system. We are right now down to about 30
 minutes for 5 camera views (app 80 frames each).
Erik B. Simonsen, Associate Professor, M.Sc. Ph.D.
Institute of Medical Anatomy section C.
Panum Institute. University of Copenhagen
Blegdamsvej 3., DK-2200 Copenhagen N
Phone:  +45 35 32 72 30 (work)  Fax: +45 35 32 72 17
Phone:  +45 45 80 93 04 (home)

Dear Mr. Tabakin,

It is very nice to mail you.  You seem to plan  a useful study for clinical
gait analysis.
I am a Korean(South) physiatrist(Doctor of rehabilitation medicine). I am
studying clinical 3D gait analysis with APAS(ariel performance analysis
system) interfaced to matlab. I use Helen Hayes marker set and I calculate
the kinematics with my own method which is based on Grood and Suntay's
Nonorthogonal Joint Coordination System(floating axis). Actually, I made a
modification to the HH marker set with an aim of estimating the joint center
better. I think I should study to determine the modification would be really
better than the original one.

Could I participate in your study? Or would you kindly share the experience
with me?
I would like to inform you that I have only kinematic data because I do not
have a forceplate yet.

Although he may not remember me, I know your professor via email
communication. It was like a brief distant learning and he was very kind to
teach me.
Before I use the HH marker set, I tried his marker set on the "Dynamics of
human gait".
But I gave up his marker set because
   1. We have only 4 cameras which is not enough to cover the Vaughan
marker set - he wanted to call it CCC marker set.
   2. His marker set "seems" not to be as good as HH to apply on wide range
of anthropometry. It is only "seems". I do not have any scientific data on
this assumption.
You may have more ideas on this point.

Sincerely yours,

Sun G. Chung M.D., Ph.D.
Dept Rehab Medicine
Seoul National University, College of Medicine
YeonGeon Dong 28, ChongRo Gu
Seoul Korea
(T) 82-2-760-3954, 760-2619
(F) 82-2-743-7473

-----?? ???-----
?? ??: Dudley Tabakin <>
?? ??: Multiple recipients of list CGA <>
??: 1999? 7? 16? ??? ?? 2:36
??: Gait Analysis Software

Hello all Gait Analysis Laboratories,

I am an MSc student at the University of Cape Town in South Africa,
working under the direction of Professor Kit Vaughan. My thesis
research involves a comparison of different gait analysis software
packages to determine whether the results obtained from one can be
compared with those of another. The research will not assess whether
one package is better than another, but rather will compare the
results. The results obtained from the various gait analysis models
are often used in clinical assessments of pathological gait and
decisions on operative intervention. However, different models
obviously use slightly different mathematical methods.

I plan to gather 3D kinematic and force plate data on a set of normal
subjects. I will be using the Helen Hayes Hospital marker set with 15
markers. The primary format for these data will be C3D but it will, of
course, be possible to transform the data into other formats. (e.g.
the DST format, advocated by CAMARC). I would then like to feed the
same set of data into different packages and compare the kinematic
(primarily sagittal joint angles) and kinetic (primarily joint
moments) data. Oxford Metrics and Peak Performance have already
offered me temporary use of their gait analysis software packages and
I am hoping that I will also be able to process my data using the
QGait package from Qualisys and Orthotrak II package from Motion
Analysis Corporation.

I am therefore interested in hearing from you if you are using either
QGait or Orthotrak. The best way that my analysis could be
accomplished would probably be for me to send my data to you and you
pass it through your program and return it to me. I realise that this
is a sensitive issue, and I wish to emphasize that this is purely an
academic project. The results will, I believe, be of benefit to all
those involved in clinical gait analysis.

I look forward to your advice.

Yours sincerely

Dudley Tabakin
Gait Laboratory
University of Cape Town
Sport Science Institute of South Africa
Cape Town
South Africa
Tel: +27 21 686 7330 ext. 257

To remove yourself from the CGA list, mail to
with the following single-line message :

unsubscribe cga

Hi Ken
I am hoping that we will be finished by August 1.  Of course, I will ship
it back to you immediately.  I will keep you posted.

Ken Wagener wrote:

> ISB is August 8-13 in Calgary.
> New York went great, I was impressed with the ease of use of the Ariel
> software, and it made everything simple and straightforward.  They are
> probably going to purchase an upgrade to the software soon.
> Ken

Kistler Corporation

Dear Dr. Dohle,

Gideon Ariel has asked me to answer your inquiry about the opposition
movement and automatic tracking of that.

We have had the apas system here for several years and use it on a daily
basis for 3D analysis of walking. It should be perfectly OK to use the
system for tracking the thumb movement in 3 dimensions. After experimenting
a little with the type of markers and their size, it will be possible to
track the movement automatically. You will have to use at least two
videocameras and a rather small calibration cube. You may build the cube
yourself, but I guess it is easier to order one from Ariel Dynamics.

The 3D coordinates can be exported in ascii, but you may also export the
apas files directly to Matlab, we always do that. Then it is easy to perform
an FFT in Matlab.

The apas system can also perform a frequency (FFT) analysis, but I think it
will be better to use Matlab or another signal processing program.

You are welcome to visit my lab if you want to see how we use the system
here. We have been very satisfied with the system and also with the service
from the company.

Sincerely yours

Erik B. Simonsen, associate prof. Ph.D.

Erik B. Simonsen, Associate Professor, M.Sc. Ph.D.
Institute of Medical Anatomy section C.
Panum Institute. University of Copenhagen
Blegdamsvej 3., DK-2200 Copenhagen N
Phone:  +45 35 32 72 30 (work)  Fax: +45 35 32 72 17
Phone:  +45 45 80 93 04 (home)

Dear Dr. Ariel,

Hope this message will find you in good health and high spirits wherever
in the world you happen to be.
Just yesterday I was in contact with Stan who helped me bring back to
life one of our old APAS computers that I use for video capturing. He
copied some backup files and I am up and running again.
I have to prize you and your staff for all the help and support you gave
us over the years. As I said to Stan, you have a lot of patience with
your users, and I certainly appreciate it.

Well, there is another reason for this message. Remember offering up to
500 APAS workstation licenses? Just kidding.
We have a network of 25 computers, used by students, that we would like
to equip with data analysis software. Over the past
3 years more than 250 students had a chance to work on APAS and my
experience, as instructor, is very positive. With network version we
would be able to expose another 100/year to the APAS.

Could you please let us know what would it take to get the network
version of APAS (our network is Novel 3.12, and workstations have Win
95) for 25 users. We would like to install and test it before September
99, if possible.

I am looking forward to see you again (ASB in Pittsburgh, maybe). It is
always a great pleasure meeting you.

Sincerely yours,

Aleksandra Zecevic

Dear Mr Ariel,

Thank you so much your warm words I got today morning.
Your are really a very great person! You know I have mail-opportunity only at my work-place (National Bank of Hungary) where I work az a secretary. It was a great pleasure reading your human words. Please do not take as a polite gesture from me, it seems from the mentality of your letter that You were/are  a sportsman! Only the sportsmen's have this kind of clear minded personality with opened heart.

Reading your letter some questions raised to me. I would like to ask them below:
Dear Mr Ariel,
Please let me know that this APAS system can be used by such an outsider (not a professional sport-biomechnics searcher) rowing coach, rower with the help of a heart-rate monitor fixing on the sportman? By the way we  bought two years ago a   Polar-Favor  typ. simple heart-rate monitor for Chirstmas present for my son (it consisted of a belt and a watch). It was the cheapest one (the prize of it was more than 10 thousand forints in Hungary - the rate is: 1 USD equivalent 270 HUF -...) and sorry after used some months it spoiled. The service said that the new belt would be the same prize of the whole new monitor. So at this time he has no such monitor ,as he   has been informed that a suitable monitor which may be conneced to a computer would be about 50 thousand HUF. (My salary at the bank is 70 thousand HUF monthly...)

Do we think well,  that this would be a register wich recognizes /gives the data about the sportman in training  into the computer, and your software analysis them?

To make  the process clearer, I would phone You, but my English is better  writting because I have not much opportunity to practice it.

It is really very generous gesture from you giving us free your super software, but first of all we have to buy a computer. This aim have been spoken in the family sometimes, but the prize of a new is rather high in Hungary. Secondhand computer configuration has a great risk.. If You know somebody or a shop where we can buy - as You have mentioned -  at about less then net 400 USD the suitable configurated computer, (please let us know, because we can transfer the prize Bank to Bank operation.

The transporting fee would be the other greater sum, but I would inform about the possibilities in Budapest.
Just now I see, that I wrote you so long, please excuse me for take off your time so much.
If You would not mind I would call you at the second part  of this week.
Whising You good health, and all the best in your private life  as in the scientific carrier, too

Kati Szigethy

Ps.: Tomorrow I will be one-day holiday, so I can read your message only on Thursday-Sept.2.-.

From: Gideon Ariel
To: Szigethyne Tarr Katalin
Cc: Aleksandra Zecevic; Miller Doris
Subject: Re: Enquiry
Date: Monday, August 30, 1999 3:55PM

Dear Szigethyne:
  Thank you for your message.  I am sending a copy to the people mentioned so you will have their address and they can respond.

  By the way, if you have a computer, you can download the APAS system and I will issue you the site key. It will not cost you anything.  A computer today you can purchase from the net at less then $400. If you have any problem to do that, let me know.  I will supply you all the software you need. Also, could you send me a copy of the article you mentioned. I do not have it. My system is used World wide in more then 6000 locations.  Dr. Doris Miller and her staff are World leaders in this field. I am sure you will hear from them. Since I am going to give you my software for free (It cost $5000) I am sure Doris will send you the CD. We hope that in Hungary in the area of Rowing you will join us at the 21st Century. Just because your association does not have a computer it does not mean that you cannot get it now. As an Olympic Athlete myself in the 1960 and 1964 Olympic games I remember the Hungarian teams and their coaches as one of the best in the World. And I know your sports institutes which have my APAS system and use it to its maximum.

In anyway, check my web site at:  /

Hope to hear from you
Gideon Ariel, Ph.D.

The World best Motion Analysis Systems and
Computerized Exercise Systems.

West Cost Headquarters:
Ariel Dynamics, Inc.
6 Alicante St.
Trabuco Canyon, CA 92679 U.S.A.
Office in San Diego:
Ariel Dynamics, Inc.
4891 Ronson Court
Suite F
San Diego, California  92111  USA
(619) 874-2547 Tel
(619) 874-2549 Fax

Web Site:  /
Download free copy of the APAS system at:

  Hope to hear from you
Gideon Ariel, Ph.D.


 ----- Original Message -----
From: Szigethyne Tarr Katalin
To: 'APASlight'
Sent: Monday, August 30, 1999 5:27 AM
Subject: Enquiry

Dear Sirs,

In the February-March issue of the Rowing Canada Aviron Journal we have read with a great suprize about the computer-systems supported APASlight software wich makes supermodern biomechanics analysis in rowing training methodology. Sorry we have no computer nor at home and in the rowing soport club, too.

It is Hungary, not Canada...
But we are interested in the "Rowing Video Database, which now general release." very much.
Please let me know where/how  could we make connection with Mr. PhD in Biomechanics Dr. Volker Nolte, Ms. Aleksandra Zecevic or Ms Doris I. Miller, who have created a database of 240 video clops of National Team athletes in practice.

We would like to know whether these video clips could played back on video-recorder or not. Only by the help with computer? To say the truth we do not understant it clearly, but would be is very-very important and useful so much for my son, Lszl Kaps, (18) who is  the qualified member of the Hungarian Rowing Youth Team, has been rowing for almost 6 years. It would be the most effective help for him studying  such  video-casettes. How do rowint the athletes on the top of the world.

We would choose the right video clips according his age, weight tall, etc.and creating a split screen and locking the video step by step...

If  the prize some of this studying video clips would be a reachable one for us, we would buy them at once.

Please let me notice on the above mail-address for your convenience.

We are looking forward to your response very much,

Wishing you all the best,

Kati Szigethy


Dear Mr. Millen
Dr. Ariel has asked me to respond to your inquiry to him.  I am a
physical therapist in NJ.  I have used his equipment, CES and APAS, for
20 years.  I currently have a mobile system for collecting data at
remote locations.   I use the CES for diagnostic and treatment
protocols for patients with sports, workers compensation and other
medical problems.  I have also had extensive use the CES equipment in
the fitness arena.  I currently use APAS for pre-treatment analysis,
Functional Capacity Evaluations, etc.  In my opinion, this is the most
versatile and best equipment on the market today.  I say this as a
completely independent professional.   I have a booklet that I have put
together with several examples of use of the APAS in workers
compensation.  If you would like a copy, I will be happy to send it to

I would be happy to correspond with you more or talk to you personally
about your inquiry.  Would you elaborate more on your plans?  Are you
approaching this project as a medical professional or a businessman?
What stage are you at?   If I have a little more information, I will be
able to assist you better.

I am going to be in Florida for a project with Humana Workers
Compensation Division, in early October.  Perhaps you would like to meet
with me in Orlando?

Hope to hear from you.
Bob Wainwright

Hi, Dr. Ariel,

How are you doing there?

Was so nice to be with you in Coto. Thank you for your warm hospitality and
delicious, big dinners, nice weather...  Most of all, I was so happy that
you accepted my work as a useful thing especially because you were the only
one who taught and introduced me biomechanics. I hope our team can make the
top system which nobody can do!!!

Now I can understand what you mean with Net-digi. The doctors or PT's do not
have to have the system. They can do it only with cameras and capturing
capability. After they make the avi's the net-digi would do all kind of
processing and they will have the results. Because they do not do anything
for the analyzing process, the net-digi should provide more detailed,
multimedia oriented report relating the numeric data with video and stick to
make them determine the validity and rely on the results. I can see what you
mean... Very very good idea. We can make every hospital to have the
capability of kinematic study. The money they should spend is only for the
cameras, capturing capability and net connecting. They can have continuously
progressing kinematic system!!!

The LA was so challenging and dynamic city. Would you like to hear what
happen to us on the way to the LAX?

We went to the bed at 5am Wednesday after packing and ordering... Woke up at
7am. Departed at 7:40 am. Slightly late. But we wanted to drive the pacific
coast as you said. Drove down on the El Toro with the hope to reach the
pacific coast Hwy. Just after passed 'I-73', the El Toro became only one
lane road and stagnated. So, gave up the pacific coast, turned abruptly and
reversed the direction, took 'I 73 north' and continued to 'I-405' as you
know. There seemed no problem until we reached the long beach at 8:40am. But
sudden stagnation was seen even on the carpool lane. The stagnation was so
bad and the cars hardly moved. No exit was found. A man on radio said that
some kind of police activity was on the long beach I 405 and they totally
blocked the I 405. Got out of I 405 to cherry street at 9:55am. Drove very
slowly due to containers, trailer cars on the wilow street. It was very
lucky to find "I 710 north" by chance then, drove like a crazy man to
'I-105'. With the great help of the map that Ana gave to me, we could safely
get out the I-105 and get the enterprise at 10:30am. We did it!!! Wow, it
was very very challenging. The police men blocked whole lanes of I 405!!!!!

The weather in Atlanta is a little colder than that of LA. We will stay here
until 16th then we will back to Korea.

Again, I and my wife really appreciate for you and Ana's welcoming. Please,
visit Korea with Ana.

Please, tell Ana that we were very happy for her kind consideration and
sorry that we left so much food and sweepings.

Hope to hear from you...



You never cease to impress me both with your speed of response
(regardless of the time of day) and with the professionalism and
organisation of your business.  I have printed the instructions from
the web.

Thanks very much.  I look forward to seeing you on Thursday 28.

Best regards


Ross H. Sanders PhD
Senior Lecturer
School of Biomedical and Sports Science
Edith Cowan University

Ph: +61 8 9400 5860
Fax: + 61 9400 5717
ISBS home page:

I owe you a beer first time I see you! THANK YOU!!!
Off to the class. Will let you know how it works.

Ariel wrote:

> Hello Alex,
> We are going to have to set up Ariel-Canada with all these APAS systems you
> have now!  I have listed the Site Keys below each Site Code.  You are
> correct in using the number 0 instead of the letter o.
> I hope this information makes it in time for your class!
> John
> ----- Original Message -----
> From: Aleksandra Zecevic <>
> To: Gideon Ariel <>
> Sent: Monday, October 25, 1999 6:18 AM
> Subject: Site Codes
> > Hi Gideon,
> >
> > You have a great sense of humor - always dancing on the edge.
> >
> > Here are Site Codes for 20 computers in our student computer lab.
> > Unfortunately 5 units are not functioning properly but technical
> > department is working on it as we speak. As soon as they fix problems I
> > will come back to you with another 5 Site Codes.
> >
> > To keep track which computer is which I will use their numbers as in the
> > lab.
> >
> > Please note that I can't distinguish between 0 (zero) and letter O in
> > Site Codes. There are 6 codes that contain 0 or O. As a start, I typed
> > all these cases as 0 (zeros). If the Site Keys do not work I will let
> > you know and we could try with O.
> >
> >
> > UNIT 1              out of order
> >
> > UNIT 2     Site Code:     DFAB 1206 7F4A F2FE A5
>          Site Key:    D764 711E FC47 4A08 EEB0 6423 1B
> >
> > UNIT 3     Site Code:     DED7 A5CC 7F4B 8FBA C5
>          Site Key:    D6B1 378C FC46 9E9A EEB1 B0B0 C4
> >
> > UNIT 4     Site Code:     D64E 649C 7F43 1ED6 FD
>          Site Key:    F7DE 7B8E FC67 D098 EE90 FE9C 24
> >
> > UNIT 5     Site Code:     D7BC 313A 7F42 ED74 BD
>          Site Key:    F645 3B54 FC66 4A42 EE91 64C8 9E
> >
> > UNIT 6     Site Code:     DE40 0BF5 7F4B 182A 5C
>          Site Key:    D7B2 D46D FC47 9C7B EEB0 B239 8F
> >
> > UNIT 7     Site Code:     D787 F1C1 7F42 D6E3 CC
>          Site Key:    D63E D6E2 FC46 11F4 EEB1 3FDC F1
> >
> > UNIT 8     Site Code:     DEA4 A5BF 7F4B FC06 2C
>          Site Key:    D7BD 0CBA FC47 93AC EEB0 BD63 34
> >
> > UNIT 9     Site Code:     DF2C 7EED 7F4A 7524 94
>          Site Key:    F748 7E1D FC67 460B EE90 684E DC
> >
> > UNIT 10    Site Code:     DFAF D8C8 7F4A F624 8E
>          Site Key:    F7FF 895D FC67 F14B EE90 DF3D 07
> >
> > UNIT 11            out of order
> >
> > UNIT 12    Site Code:     DEE4 9DC7 7F4B BC94 66
>          Site Key:    D706 8D80 FC47 2896 EEB0 06CA 5D
> >
> > UNIT 13    Site Code:     D644 39CB 7F43 1463 66
>          Site Key:    D66B AACB FC46 44DD EEB1 6ADE D1
> >
> > UNIT 14            out of order
> >
> > UNIT 15    Site Code:     DF1B B014 7F4A 429D 6C
>          Site Key:    D6AF 4AEF FC46 80F9 EEB1 AE3B 34
> >
> > UNIT 16    Site Code:     DFDD E381 7F4A 8464 0E
>          Site Key:    D799 F466 FC47 B770 EEB0 9935 18
> >
> > UNIT 17    Site Code:     D76C A57E 7F42 3D51 93
>          Site Key:    D676 4F33 FC46 5925 EEB1 77F0 38
> >
> > UNIT 18    Site Code:     DAB1 8B80 7F19 5C47 8E
>          Site Key:    F546 716A 59B4 4A08 9A43 6432 1B
> >
> > UNIT 19    Site Code:     DEA4 A5BF 7F4B FC06 2C
>          Site Key:    D7BD 0CBA FC47 93AC EEB0 BD63 34
> >
> > UNIT 20    Site Code:     DF2C 7EED 7F4A 7524 94
>          Site Key:    F748 7E1D FC67 460B EE90 684E DC
> >
> > UNIT 21    Site Code:     D6EA A8F4 7F43 BA5D EA
>          Site Key:    D7C6 EF22 FC47 E834 EEB0 C6CB FF
> >
> > UNIT 22            out of order
> >
> > UNIT 23    Site Code:     D67E C901 7F43 2E3E 32
>          Site Key:    D736 C9F4 FC47 18E2 EEB0 3684 0E
> >
> > UNIT 24    Site Code:     D66A 528E 7F43 3A4F E0
>          Site Key:    D7ED AB4D FC47 C35B EEB0 EDDB 26
> >
> > UNIT 25            out of order
> >
> >
> > I would appreciate if you could send me Site Keys as soon as possible.
> > This afternoon I have a class where I plan to teach others how to use
> > your software.
> >
> > Looking forward to hear from you.
> >
> > Alex

Hi Gideon and John,

     IT WORKS!!!!!!

I must admit I had chills this morning looking students working on their
project using APAS. I am sure both of you would be proud to see it. I will send
you some photos (for the web).

All Site Keys that John send yesterday worked just fine. Once again Thanks John
- beer follows.
Yesterday we tested easy to use instruction (5 pages) that students follow when
digitizing, filtering and exporting data. That worked well too.

Technicians are still working on 5 computers that have hardware problems but as
soon as they become usable I will send you remaining 5 Site Codes.

As always it is a great pleasure working with everyone from Ariel Dynamics.
Gideon, thanks for this "special arrangement" for our lab. I am convinced some
of our students that now learn how to use APAS will remember your system when
they go out to the "real life". Just like Volvo - they give out more children
toys during the Car Show in Stockholm than any other marketing material -
knowing that in the future it will pay off.

As for Ariel-Canada, hmmm, sounds pretty good idea. Would not you need a local

Sincerely yours,

Dear Mr. Ariel,

Our company has used your APAS since 1988. Perhaps you still remember Dr.
Susanka and Dr. Jurdik that, with your help, enabled biomechanics of sport
here in Prague, Czech Republic. At that time APAS was a state-of-the-art
system and we had been using this old one more then ten years with absolute
satisfaction. We are looking for something new, something more up-to-date.
I have visited your web site and I
am very happy, that APAS is still improving. It is great that you have
adopted modern technologies. We seriously consider a purchase of APAS for
Windows. We are especially interested about system with JVC 120Hz cameras.

I have a few questions concerning APAS:
1. Is there any upgrade price from "ancient" versions of APAS?
2. I am a bit confused about the exact product name of high-speed JVC
cameras your system works with. Is it GR-DVL9500U?
3. What is a price of software with JVC cameras (2 and 4 pcs)?
4. What additional hardware is needed for transport of data from JVC camera
into the computer?
5. Do you provide any special software or hardware for data transfer?

I would be grateful for any additional information concerning APAS.

I am looking forward to hearing from you soon.

Libor Soumar

Podbabska 3
160 00 Praha 6
Czech Rep.

tel.:+420-2-20 20 46 49
fax:+420-2-311 50 69

Hi Gideon,

Do you get all e-mails I send to John? Do I need to send you a separate mail or
one is enough?

Thanks for photos. You made my day! Now I can daydream about California instead
of working. Don't you know that it is dangerous to tease Canadians with beach
photos in November. It is so easy to get depressed. Just joking!

Ariel Center is absolutely BEAUTIFUL!!! As I wrote to John - you DO KNOW what
you are doing to make your and yours staff lives better.

As for APASgait I need some more time to check it out. I am teaching a course
in Physio Therapy this semester and at the end of the term students will make
presentations - Application of biomechanics in PT clinic. An option is to
present a peace of equipment and how it could be incorporated to every day
clinical operation. I will suggest to the students to check your site. Someone
might choose to learn more about it and present it to the rest of the group. We
will see.

The following is a message i sent to John few minutes ago.

Hi John,

You sleep longer than Gideon. He already sent me the Key  (Site key: F637 9588
FC94 1246 EE91 E48A C8) few hours ago. Thank you any way.

He also sent a web site on which I finally had a chance to SEE you and others
in ARIEL DYNAMICS ( Considering
this paradise you work in I am surprised your company is doing so well. I would
be tempted to leave all the stress and problem solving for a good swim.
Hmm, maybe that is why you are doing so well. Gideon knows what he is doing.

I wish I am there right now. The sky felt on our heads in London today. It
rains. It will not be long before first snow. Brrrrrr.


Gideon, a student just came in to tell me that rain has stopped but the snow
By, by I am going to the dreamland (CA).

Hello John,

Thanks for your promt reply and assistance. I tried exporting using both
the display and APAS2text methods and both were fine.  Am now using the
APAS2text method and successfully reading the data into the analysis
program.  Thanks very much.  Once you know how it is certainly much easier
and friendlier than Peak and Motion Analysis (at least from the systems
that I used at Otago and ECU respectively).



Professor Ross Sanders PhD
Chair of Sport Science
Department of Physical Education Sport and Leisure Studies
Moray House Institute of Education
The University of Edinburgh
Cramond Road North
Edinburgh EH4 6JD

Telephone  (+44) 131 312 6001 ext 208 or 212
Fax (+44) 131 312 6335


Hi Gideon,

Did I tell you about using APAS for golf data collection.  Have just
written a program to calcualte all sorts of stuff from the two marks on
the shaft - forces and torques etc.  There were nearlt two thousand
subjects and we collected the data in bright daylight.  Most are
digitsiable automatically using APAS - only problem is when they have
shiny shoes, white laces or white trousers.

Also have now had success with underwarter balck markers for swimming.
Will now establish the protocols to use for servicing British Swimming.
We will be leading again thanks to APAS.

Read the golf article, particularly, the first one when you get the chance
- this is the model for bringing sports science and coaching together!

Catch you soon,


Professor Ross Sanders PhD
Chair of Sport Science
Department of Physical Education Sport and Leisure Studies
Moray House Institute of Education
The University of Edinburgh
Cramond Road North
Edinburgh EH4 6JD

Telephone  (+44) 131 312 6001 ext 208 or 212
Fax (+44) 131 312 6335


Dr. Ariel,


Now that the spring semester is over I would like to take this opportunity to explain to you in detail how APAS was used this academic year at The University of Tulsa.  To do so I must first described the computing and environment on this campus.


For all practical purposes there are no freestanding computers in the university system.  I suppose an exception would be laptops although most of them are also dockable.  Any time a student or professor sits down to use a computer he/she must log onto the network with a public login phrase and a secret password. Upon successfully logging in he/she is able to use that computer including any local or network software for which he/she is authorized. So that computer is a workstation but also a network node. I'm going to use one of my students, Bill Adams, as an example.


When Bill logs on to a campus computer, appearing on his monitor desktop is an icon linked to a hard drive somewhere on a server on which he is authorized several gigabytes of disk space.  This drive is called W. The physical location of W is unknown to the user. Bill accesses W: exactly as he accesses the local computer C: drive. He can drag and drop from one to the other and he can furnish the name of any folder on W: to any program requiring a filename for input or output.  For operational purposes there is no difference between the way Bill uses W: and C: except that W: is available on any computer on campus on which he is correctly logged on. The data on W: is permanent as long as he is a student here.


As a faculty member I have an additional logical hard drive called S. For me S and W work the same way. Any other person on campus, student or faculty, can access my S: drive as read only. So one way for me to make an APAS data file available to every student in my class is too stick it out on my S: drive and let them know it's there. In addition we use a course management program called WebCT which is located on yet another server and has the capability to store, upload and download files upon request to authorized students. Authorized means students whose names are on my class roll.


In my office I have two computers one of which is here primarily for the use of students who want to come in and work on an assignment with me present to help them. Both computers access W:, S: and WebCT as I have described above. In the use of APAS in my classes I work with the systems administrators for two colleges: Engineering and Natural Sciences (ENS) and Business Administration (BA). These are located in separate buildings which have their own subnets.  I am administratively and physically located in ENS. In each building there are multiple computer labs.  All software in these labs is installed by the system administrator.  I have administrator privileges on the two computers in my office but that's the only place I can personally install software.


The way the system administrators install software is to push all packages to be installed in all computers in their subnets in one fell swoop.  When they do this, the first thing that happens is that the disks are reformatted. In rooms in which there are one or two isolated computers they will install software on them individually but they will not install a program on five computers in a lab of 40, for good reason I might add. Examples of such isolated computers are faculty offices and classrooms.  We have console computers in virtually every classroom with projectors hanging from the ceiling.


 The system administrators in ENS and BA install software in slightly different ways that have a significant effect on how we can use APAS.  In ENS APAS must be installed on each computer separately requiring a new site key each time. In BA they can push APAS into computer labs or complete subnets with one site key.  What I have described is referred to as a distributed computing environment.


This year I worked with three classes using APAS.  In the fall term I had a special topics class of four students, two math majors and two athletic training majors, with the principal goal of learning to use APAS and applying it to one or two skills.  The skills we analyzed were a standing back flip and a volleyball spike.  To implement APAS those students used the two computers in my office. In the spring semester I had a similar class of three students, all athletic training majors, who learned to use Gait and applied it minimally to several subjects with normal gait.  These students also used APAS on the two computers in my office.


In the spring semester I also had a class of 30 students enrolled in SI-1004 Sport Science. This is a course we've developed over three semesters. It has a lab component in which we used APAS for the first time this past semester. Sport Science is a general education course for non-science majors, for example marketing, sociology, English literature and what ever have you majors.  There is no mathematics background required apart from what it takes for admission to the University. These students are meeting a science requirement which means that this is one of their few ventures into the world of science. The course is mainly Newton's Laws apply to sport skills.  It turns out that APAS is a marvelous tool for this purpose.


There are three lectures per week plus one two hour lab. The lab was spent either videotaping or viewing demos in the gym, or using software, principally APAS, in the BA-100 computer lab. We also used Matlab and Excel. BA-100 is a lab that is locked and thus inaccessible except during scheduled periods which for us was 1:00 – 3:00 PM on six Wednesdays during the semester.  At 12:00 PM on those days the BA system administrator pushed APAS and Microsoft Office onto the computers in BA-100 and APAS was used by the 30 students simultaneously for two hours.  After the class was over the standard business package was pushed onto those computers overwriting APAS since step one of the processes reformats the hard drives.


Toward the end of the semester we had five groups of six students each do a project.  These were a roundoff, a roller hockey slapshot, a softball pitch (two groups) and a field goal kick.  The students compared and contrasted a varsity athlete with a novice.  In order to give the students access to APAS for these projects the system administrator pushed APAS to all the computers in BA-123 which is a computer lab with 24-7 access. Access to APAS was limited by the network to students on the SI-1004 class roll.


After the students had done their videotaping I captured the video using my office computer which has an attached digital VTR. I constructed template trace files and sequence files for them and put these out on the WebCT site in folders accessible to the groups.  I made available their image files in the same folder. A student in the group was assigned to synchronize and trim the image files.  These were all done during a lab session in BA-100. The student accessed the WebCT site using Internet Explorer and downloaded all the files needed onto his W folder.  He ran the trimmer against the data in his W folder and then uploaded the trimmed files back into his group's WebCT folder making them available to other students for later use. The trimmed files were left in his W folder for backup.


Suppose Bill Adams was assigned the job of digitizing two views.  That's about an hour's work for each view.  Given an hour between classes Bill would go to a computer in BA-123 and download the trace, sequence and image files he needed from the WebCT site to his W drive.  He ran the digitize module against the data and, when finished, uploaded the updated trace file back onto his group's WebCT folder and notified the rest of the group by e-mail that the digitization of that view was finished.  Smoothing the data with the filter module was done the same way. APAS was available to students in the class in this way for two weeks. To produce displays for the report, a couple of students from each group came to my office and we repeated the process above from my number 2 computer and printed the display that they wanted. I would estimate that each student in the class used APAS for about 5 hours doing the semester projects.


What I have described in detail is how we do computing and how we used APAS.  I hope our use of APAS is in the spirit of the liberal license you have in mind.  No students or faculty other than I and the 37 students I enumerated used APAS. It was installed also on the console computer in two classrooms so that I and my fall semester students could present papers at the annual meeting of the Oklahoma-Arkansas section of the Mathematical Association of America. That required two installations of APAS and two site keys. Those installations were used once for practice and once for the presentations.  It was also installed on the console computer in my SI-1004 classroom where I used it twice during class time.  We also installed it on three computers in an isolated ENS computer lab where it didn't work because the version of Windows would not decompress the codec used to compress the image files. Those six installations will be overwritten the next time computers in the subnet are re-imaged if, in fact, that has not already been done.


APAS was never installed on any laptop or anyone's personal computer. It was installed five times on the two computers in my office due to disk crashes and operating system changes to XP and one faulty installation.  We also have the computer we bought from you with APAS already installed, but we've never used it, principally because it's located in a lab that is not yet wired to the net. As I recall it has 7 IEEE-1394 ports and will be used when we need it for real time data capture.


I would respectfully suggest that within our computing environment there are several ways that the use of APAS can be limited to a reasonable interpretation of the license such as locked doors and password access. But it will be very difficult to do it by counting boxes or site keys.  At this moment APAS is installed in BA-100 and BA-123 but only Dr. David Carr and I can use it because of password limitations.  Along with the two computers in my office and the delivery computer in the athletic training lab, these are the only computer on which APAS is available for use.


I have been assuming that my role in this business is to infect as many people as possible with APAS.  This applies to students as well as research faculty who know how to get grant money. It seems to me that everybody benefits from as much use here of the present APAS system as possible as long as it's for classroom work and unsponsored research. It should never be carried off campus on a laptop except as a demo and never by telephone connection.  If it's proposed to be used in a research grant, then a license should be written into the budget.


My apologies for the long letter.  


Tom Cairns





[Back to FAQ] [Back to Home Page]



Copyright MCMXCVI by Ariel Dynamics
Web Site Design by Gideon Ariel