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.