Abstract
Experiments were performed to investigate the muscle strength ratios and the maximum strengths exerted in 6 tests of hip flexion, hip extension, pulling the leg forward, pulling the leg backward, knee extension and plantar flexion. The subjects were 5 healthy males from 20 to 29 years old. The following results were obtained: 1. The maximum voluntary isometric muscle strength varied according to respective angles of all joints. 2. The maximum strength values were obtained when the hip angles were 210° in hip flexion, 90° in hip extension, 240° in pull the leg forward, 120°in pull the leg backward; the knee angles was 100° in knee extension; the ankle angle was 80° in plantar flexion.
