Abstract
The purpose of this study was to investigate the effects of fatigue on the hamstrings and quadriceps during concentric and eccentric actions at 60 and 150 deg/sec. The dominant leg of 12 subjects was tested on the Biodex B-2000 isokinetic dynamometer (Biodex Medical Systems, Shirley, NY). The results showed that the eccentric mode of action, 150 deg/sec angular velocity, and quadriceps muscle group were levels at which fatigue was significantly delayed than at corresponding levels of concentric mode of contraction, 60 deg/sec angular velocity, and hamstrings muscle group. Subsequent analysis showed a significant three-way interaction. A significant simple, main effect was determined to exist for the quadriceps muscle group at the 150 deg/sec angular velocity for mode of action; concentric fatigue was significantly greater than eccentric fatigue. The findings of the present study suggest that isokinetic fatigue training protocols must be designed to meet the specific training objectives if the desired outcomes are to be met.