Affiliations: [a] Walton High School, Marietta, GA, USA | [b] Department of Kinesiology and Health, Georgia State
University, Atlanta, GA, USA | [c] Department of Physical Therapy, Georgia State
University, Atlanta, GA, USA
Note: [] Corresponding author: Laurie L. Tis, Department of Kinesiology
and Health, Georgia State University, University Plaza, Atlanta, GA 30303-3083,
USA. Tel.: +1 404 651-4022; Fax: +1 404 651-4814; E-mail: Itis@gsu.edu
Abstract: The purpose of this study was to determine the validity of the
velocity measures of the Kinetic Communicator 500H isokinetic dynamometer
(Chattecx Corp., Inc., Hixson, TN) through the use of the Peak 5 motion
measurement system (PPTI, Englewood, CO 90112). Ten healthy college-aged
females were filmed with a 200 Hz camera performing concentric knee extension
and flexion with their right knee at seven pre-set velocities ranging from 60
to 240 deg/s. The video was automatically digitized and analyzed utilizing the
Peak 5 motion measurement system and the angular velocity measures were
averaged together in 10 degree increments and compared to the averaged measures
from the software of the Kin-Com 500H dynamometer. Because of the small
variance in Kin-Com data, correlational analyses could not be performed. Paired
t-tests revealed significantly different velocity measures at 90 deg/s, 120
deg/s, 150 deg/s, 180 deg/s, and 210 deg/s at certain points in the range of
motion. These differences ranged from 2--6 percent. When compared to the Peak 5
system, the Kin-Com appears to provide an accurate assessment of velocity under
clinical conditions.
