Abstract
The purpose of this study was to assess the test-retest reliability of the Biodex System 2 isokinetic dynamometer. Twenty subjects performed knee concentric reciprocal extension/flexion exercise on 2 consecutive days, separated by 24 hours. Peak torque (PT), total work (TW), average power (AP), and joint angle at peak torque (JA) were collected from three repetitions across a velocity spectrum of 60, 120, 180, 240, 360, and 450 deg/sec. Correlation values between days 1 and 2 for PT, TW, and AP for both extension and flexion ranged from 0.86 to 0.98. The JA correlations ranged from 0.22 to 0.69. Also, extension and flexion mean values for PT, TW, AP, and JA on day 1 were not significantly different (p < 0.05) from the mean values derived from day 2, with the exception of flexion JA at 60 deg/sec. It was concluded that the Biodex System 2 isokinetic dynamometer is a highly reliable instrument for assessing reciprocal concentric isokinetic parameters of knee extension/flexion.