Abstract
The characteristic relation between force and velocity was studied by isotonic lever-pulley system against the different load in human leg extensor muscle. The velocity of the lower leg extension was calculated from angular velocity by the electrogoniometer and the force was measured with straingauge tensiometer. The results were as follows: 1.As the velocity of the lower leg extension decreased with the increase of load, the force-velocity relation was presented by a hyperbolic curve as shown in the arm flexor. 2.This relation was fitted to Hill's equation except a range of the maximum velocity in adult females. 3.The mechanical power calculated from the force-velocity relation showed the maximum at approximately 30-40% of the maximum strength and at 29-36% of the maximum velocity. 4.The maximum velocity was 4.30 m/sec for adult males and 4.22 m/sec for adult females in average. The maximum strength was 67.8kg for males and 42.4kg for females. The maximum mechanical power was 41.7kgm/sec for males and 22.6kgm/sec for females. 5.The force-velocity relation in athletes showed specific pattern, that is to say, the curve for sprinter showed further higher pattern than that for middle and long distance runners. In the football player, goalkeeper showed also higher curve than the field players.
