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From: Pierre Gervais, PhD

University of Alberta

Faculty of Physical Education and Recreation

July 13, 1998

Re. Ariel Dynamics Motion Analysis System

...............................................................................................................

Dear Dr.

Sorry for the delay in responding to your recent FAX. You caught me at a very busy time. We have had the motion analysis system from Ariel Dynamics since January of 1992. The system we purchased included 3D motion analysis software and analogue software. In addition to the computer and monitors we received 2 SVHS camcorders, a Bertec force platform and 4 channel EMG. The camera + VCR allows for a 60Hz sampling rate. The Analogue allows 2000Hz over 16 channels. Generally we have been very pleased with the system. In the realm of computers and similar technologies it has been as reliable as any and I would probably suggest more robust than many. The people at Ariel dynamics have been very good about keeping the system up an operational. I have found them to be very helpful and accommodating. On a few occasions when a file or two has become corrupted they have managed to correct the problem through a modem connection or through their ftp site. Upgrades have also been available in this fashion. The system is heavily used for research and teaching. It is used by staff, graduate students, and with some supervision undergraduate students. It is often transported between the lab and other teaching and research locations within our facilities within our faculty. I also frequently use it for demonstrations in my large undergraduate classes. It has been used in a wide variety of research projects in different sports in differing environments. For example: in figure skating: a large 3D volume in an ice skating arena., in gymnastics analysing dismounts from Parallel bars and Horizontal bar, in Wheelchair basketball, treadmill running and skating, indoor rowing, and softball pitching to name a few.

I cannot think of a similar system that may provide more analysis capabilities for the cost than the APAS system by Ariel Dynamics. For the money you can not do better. I have no reservations about recommending the system to you. We have used it almost exclusively in the lab since we purchased the system and have been very happy with its capabilities. Best of luck in your deliberations.

Sincerely

Pierre Gervais, PhD.

Director of the Sports Biomechanics Lab

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