Abstract
The purpose of this study was to assess the test-retest concentric reliability of the LIDO Active isokinetic dynamometer. Twenty subjects performed knee extension and flexion on two separate days, 48 hours apart. Peak torque (PT), average work (AW), average power (AP) and joint angle at peak torque (JA) were measured at 60, 180, 300 and 400 degrees per second (deg/sec). Pearson product moment (r) correlations between day 1 and day 2 for PT, AW, and AP ranged from 0.90 to 0.99. The JA r values ranged from 0.09 to 0.92. Extension paired t-tests revealed that mean values for PT, AW, AP and JA on day 1 were not significantly (p < 0.05) different from mean values on day 2, with the exception of AW at 300 deg/sec. Flexion t tests indicated that PT values were not different. Average work was significant at all velocities except 300 deg/sec, while AP and JA were significant at 180 and 60 deg/sec, respectively. It was concluded that the LIDO Active isokinetic dynamometer is a reliable instrument to assess concentric isokinetic strength.