砂の抗力を生かした簡易筋力トレーニングの可能性

抄録

This experiment evaluates the effectiveness of the drag of sand for strength training. Twenty cm depth of quartz sand was placed in a large box and five subjects performed knee extension/flexion against the sand drag and on an isokinetic machine at three velocities, 30, 60, and 120 degrees/sec. Electromyograms of vastus laterlis, biceps femoris, and tibialis anterior were taken, and the changes of the knee joint in motion were measured. The exercises with the sand and the machine were similar in the changing velocity and antagonist's activity. The muscle activity with the sand exercise was 30 to 50% less than with the machine. However, the intensity of the exercises with the sand was at a positive level for strength training, especially, the high velocity exercise was similar with the machine exercises. These findings suggest the exercise training using sand resistance can cause the same effect as the isokinetic training.