Isokinetic evaluation of bilateral quadriceps and hamstrings at 60⁗/sec, 120⁗/sec, and 180⁗/sec was performed using the Isokinetic Rehabilitation and Testing System (Model No. Cybex 340) on 30 male students comprising 15 soccer players (Group 1) and 15 general students (Group 2) with no significant difference in age, weight, and height between the two groups. All subjects used their right foot to kick the ball.

In both groups, there were no significant differences in the mean peak torque of both muscles between dominant (right) and nondominant (left) limbs. There were no significant differences between Group 1 and Group 2 were found in the angle of peak torque output for the quadriceps. No significant differences between the two groups were found for average power, torque acceleration energy, or total work of both muscles. There were significant differences between Group 1 and Group 2 in the hamstrings to quadriceps(H/Q) ratio at 180⁗/sec and also in the endurance ratios for both muscles at 180⁗/sec. As the angular velocity increased. the H/Q ratio for Group 1 was significantly increased(P<0.01), but there were no significant changes in the H/Q ratio for Group 2.