運動動作と生理機能 (IV) : 投動作における腰部の動きについて

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Motion of lumbar region is cosidered as an important factor to teach and to correct skills in exercise. However, for the shortage of these studies, subjective exprience is used as a teaching instruments. Recently photographic analysis of motion has been carried out in dynamic portion of the body, such as foot, arm and etc, but motion of lumbar region is fast and comlicated. Then the results obtained from this method are not enough to follow its motion correctly. Nakano et al (1970) deviced PLPA (physical locomotion pursuit analyzer), which could simultaneously record three dimensional locomotions of a point of the body. This experiment was designed to analyze hip motion in ball throw with different ball weights and speeds, using this instrument and to investigate the significance of its motion. The results obtained are as follows : 1) There was not significant difference in muscular activities of lower extremity with change of ball weights, but locomotion of lumbar region showed individual characterisity in its analysis. 2) Maximum rotation velocity of lumbar region obtained by goniometer showed exponential relation with ball speed over 8.5m/sec. 3) Three dimensional locomotion of lumbar region in various speeds of ball throw also suggested significant difference at the ball speed of 21.5/sec. From these results, motion of lumbar region in ball throw consisted mainly of left and right, and upward and downward motion. When the ball speed was faster, maximum rotation velocity of left and right motion showed exponential increase. This fact suggested that in fast ball throw, motion of lumbar region played a role of stability of lower extremity, direction of ball throw, and balance between upper extremity and lower extremity, except for throwing fast ball.
東海大学の論文

運動動作と生理機能 (IV) : 投動作における腰部の動きについて

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