女子の床反力からみた全身急速反復動作の発達

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The present study was designed to investigate the development of a rapidly repeating movement of the whole body from ground reaction forces exerted during a side jump. Subjects were 246 healthy females aged 5-17 years, and their physique(body height, body mass, skinfold thickness), muscular power(vertical jump, standing broad jump)and rapidly repeating movement(side jump)were measured. The procedure of the side jump were hopping between two parallel lines on the force plate from right to left alternately as quickly as possible. The distance between the lines was fixed at one third of the mean body height at each age. Force curves gained by using force plate were calculated using the jumping frequency per 1 second(the frequency calculated from the time required for one jump), the times on the ground and in the air, the maximum vertical and horizontal forces, the vertical and horizontal impulses and the kicking angle calculated from maximum vertical and horizontal forces. The ferquency of the side jump per 1 second increased significantly with age by 9 years and decreased gradually with age by 17 years. The time on the ground and the time in the air shortened significantly with age by 9 years and prolonged gradually with age by 17 years. The maximum vertical force per unit body mass didn't change remarkably with age, but the maximum horizontal force per unit body mass increased significantly with age by 13 years and decreased gradually with age by 17 years. The kicking angle decreased significantly with age by 13 years and increased gradually with age by 17 years. The vertical impulse per unit body mass decreased significantly with age by 9 years, but the horizontal impulse per unit body mass didn't change remarkably with age. These results suggest that a rapid repeating ability of the whole body develops by increasing the horizontal force in comparison with vertical force and by decreasing the kicking angle and the vertical displacement of the center of gravity with age by 9 years and drops gradually by ncrease of fat mas with age by 17 years.
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女子の床反力からみた全身急速反復動作の発達

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