Why Should I Purchase the APAS System

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

  • Hello Steve Bailey,

    Thank you for your interest in the Ariel technology.  Unfortunately, there
    is no margin in our prices to spend $3,000.00 for an on-site demonstration.
     Our prices are low because we sell directly from our main company. We do
    not have to pay the salaries of the "middle-man" and area sales
    representatives.  I would like to make the following recommendations to
    help eliminate any uncertanties.

    First, you should compare all available systems for features and price.  I
    fully understand having reservations on purchasing a system because I was
    once in the same situation.  I worked in the Anthropometry and Biomechanics
    Lab at the Johnson Space Center and was tasked with purchasing a movement
    analysis system.  I checked all the commercially available systems by
    personally visiting each company.  There was no comparison between the APAS
    and other systems!  I purchased a single APAS and was so pleased with the
    results that 4 more systems were purchased at a later date.  Please do not
    take my word for this.  I encourage you to fully examine all available
    systems and compare them feature-by-feature. 

    I also want to refer you to a 3rd party independent study performed by Dr.
    James G. Richards at the University of Deleware.  Dr. Richards was the
    keynote speaker at the Fifth International Symposioum On The 3-D Analysis
    Of Human Motion, July 2-6, 1998 in Chattanooga, TN.  His presentation was a
    comparison of the commercially available systems for movement analysis.  I
    have provided a direct link to his presentation below:


    Make certain that you review the full report by scrolling down to the
    bottom and selecting the NEXT button for additional pages.

    As a second option, you can download the software directly from the Ariel
    internet site (/) and evaluate it for 30 days prior to
    purchasing.  No other system in the world will let you do this!  You can
    find on-line manuals and tutorials for detailed explainations on the APAS
    system operation.

    Manuals:  /Main/adw-91.html
    Tutorials:  /topics/Tutorials/default.htm

    Contact existing Ariel customers as a third option.  I know that you have
    already visited Dr. Brian Bergemann at Campbell University.  He purchased
    the APAS and CES systems at the United States Sport Academy (as well as the
    APAS at Campbell University) and used them extensivley for sport analysis.

    Other contacts that have multiple APAS systems:

    Erik B. Simonsen, Ph.D.
    University of Copenhagen, Denmark

    Alfred Finch, Ph.D.
    Indiana State University

    Mike Greenisen, Ph.D.
    NASA, Johnson Space Center

    Sun G. Chung, M.D., Ph.D.
    Seoul National University

    Pierre Gervais, Ph.D.
    University of Alberta, Canada

    Lastly, we would be happy to provide an APAS demonstration at the Ariel
    office in San Diego, California.  If you are interested in this option,
    please contact us so we can make arrangements for a convenient time.

    I hope this provides additional information and several options to help
    eliminate any doubts about purchasing the Ariel system.  Please feel free
    to contact me for any additional questions.  I would be happy to help.

    I look forward to your reply!


    John Probe
    Ariel Dynamics, Inc.
    4891 Ronson Court
    Suite F
    San Diego, CA 92111-1815
    Tel:  (858) 874-2547
    Fax:  (858) 874-2549

    At 04:46 PM 6/10/99 -0400, you wrote:
    >Dr. Mr. Probe,
    >I am the research coordinator in the Department of Physical Therapy
    >Education of Elon College in Elon College, NC. We have been
    >communicating with various Ariel employees and have visited the lab at
    >Campbell University. At this time it is very likely we will purchase an
    >Ariel system for motion analysis. This would include the following:
    >1. Software and license for 2 computers        $5500
    >2. High precision calibration cube             $1500
    >3. Reflective markers (30/order) X 2           $600
    >4. 3 Industrial light cameras                  $900
    >5. Time code read/write                    $1500
    >6. Intreface to forceplate and EMG            $1500
    >We also expect to purchase from a local company 1 Super VHS recorder
    >($3100), 2 SVHS cameras ($1800 each), and gem locks. In the future we
    >hope to purchase up to 4 High speed cameras (120-240 Hz); however, we
    >are presently financially limted to the SVHS cameras.
    >While we are 90% sure that purchasing an Ariel system is right for us,
    >our biomechanist (Sue Chinworth) still has some reservations.
    >Consequently, I am writing you to see if you consider the following.
    >Will you allow somebody from your company to come to our institution,
    >set up and demonstrate the system to us prior to purchase ? If you are
    >willing to do so, I believe that I can guarrentee that the individual
    >visiting us will walk away with a completed P.O. if we are satisfied. If
    >this process is not acceptable to you could you suggest a way that Sue
    >C. can get some in depth experience with the system from someone who
    >knows it inside and out prior to purchase. Also, if you think we can
    >purchase those extra items through you more economically please let me
    >Thank you for your time and consideration in this matter. I look forward
    >to hearing from you.
    >Stephen Bailey, PT, Ph.D.

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

HI Tony,

Sorry about the delay.  In answer to your questions, this is the equipment I would suggest for a complete Orthopedic, Physical Therapy Clinic:

1. CES Arm/ Leg/  Back Unit
2. CES Multifunction Unit
3. APAS with Analog function
4. EMG/ on CES and APAS

All the above will be less than one Cybex.

The next step would be to add a force plate.  Gideon will handle pricing with you.

Now you have a complete laboratory capable of  (and I cannot think of all possibilities here):
1. Exercise rehabilitation (closed and open loop).
2. Rehab cardiac training.
3. Rehabilitation test and measurement (bilateral limb comparison).
4. Weight loss work training.
5. Precision athletic training for strength, explosive speed and endurance.
6. Biofeedback for sports and rehabilitation training.
7. Personal fitness and rehab training without the trainer being present (program and walk away, exerciser can take self through program.
8. With addition of APAS, precision measurement of performance for cervical spine, lumbar spine, shoulder, elbow, wrist, and total body gait.
9. Ground reaction forces for gait, sports actions, lift posture.
10. Sports performance evaluations for any sport, including equine.
11. Balance testing and training platform.
12. Dynamic EMG monitoring for Exercise and Performance events.
13. Back to work DELTA lift analysis capability.
14. Job site analysis, etc.

If your funds are limited, CES or APAS first depends on the needs of the clinic.  If primarily training and physical therapy, definitely CES.  If test and measurement orientated, definitely APAS.  However, you cannot beat the combination of tools.

As to report capability, each system has the ability to print any data that appears on the screen.  You can select and combine any combination of data, kinematic, kinetic, CES, etc. for presentation.

Further, you can do like I do, export the raw data and do a custom report on Excel or Matlab.  The advantage of this is that you can have a multi page report, customized, created and recreated in minimal time.  I can help you design these reports.

I am sure Gideon will address costs with you.  I can help you show the cost effectiveness of the equipment and how to get multi level return on your investment.

As I mentioned earlier, if you give me more feedback on the client, I can send you complete reports illustrating how we use the systems for various situations.

Hope this is a helpful start.  I am awaiting your next round of questions.  I am sure you will have many more.  Personally, I would love you to implement a system in SA so we can come back and visit.  I miss the Rock Lobster, Prawns and wine!


ps- Check my slide show on Gideon's website for workers compensation stuff.


Hello Gareth,

Thank you for your interest in the Ariel Performance Analysis System (APAS).
The APAS is a 3D video-based movement analysis system which accurately
quantifies function and provides objective data the professional may use to
justify or evaluate treatment.  Areas of successful application for the APAS
include human performance, injury and rehabilitation assessment,
quantification of loss for compensation claims, equipment and product
testing and development, determination of potential or actual risks for
products and activities in liability litigation, as well as applied research
in the areas of orthopedic medicine, therapeutics, and physical training.

The APAS integrates state-of-the-art computer and video processing hardware
with specialized software modules that perform data collection, analysis,
and presentation.  Objective quantifiable documentation is provided for both
2-Dimensional and 3-Dimensional analysis.  Specific points of interest can
be digitized with user intervention or automatically using contrasting
markers.  Stick figures are then generated and can be synchronized with
kinematics data.  Additionally, up to 32 channels of analog data (i.e. force
platform, EMG, goniometers etc.) can be synchronized with the kinematics

The APAS product information can be found on the Ariel internet site
(/).  The direct address to several areas that might be of
interest are listed below.

APAS Product Information

Comparison of Commercially Available Systems

Selected Applications Of APAS

Selected Publications Utilizing the Ariel Technology

You can even download a full version of the APAS for a FREE 30 day trial.

Please review the information and feel free to contact us for any additional


John Probe
Ariel Dynamics, Inc.

----- Original Message -----
From: "Irwin, Gareth" <GIrwin@UWIC.AC.UK>
Sent: Monday, July 30, 2001 7:05 AM

Dear All
I am looking to purchase a motion analysis system, for the application of
sports biomechanics with a limited Budget. My lab already has a manual
system (TARGET), if anybody is aware of any deals that may allow me to
purchase a automated or semi automated system please email me. The budget I
am talking about is in the region of $78,000(US) or 60,000(UK)

Kindest Regards

Gareth Irwin
Head of Biomechanics
Senior Lecturer

School of Sport, PE and Recreation
University of Wales Institute, Cardiff
Cyncoed Campus
Cyncoed Road
CF23 6XD

tel:  029 2041 6649
fax: 029 2041 6589

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