B31 バレーボール・スパイク動作に関する順動力学的分析 : 空中局面における体幹部の動きが手部速さ生成に及ぼす効果(筋骨格系のバイオメカニクス)

概要

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Since volleyball spike require large values of hand velocity to obtain large ball speed in spike motion, the purposes of this study were 1) to investigate how joint angular velocities of the upper limb and torso influence the motion-dependent term to increase the contribution due to the term to obtain hand speed prior to the impact, and 2) to clarify how torso joint torque control the body configuration under conservation of the angular momentum of the whole-body. As the motion-dependent term play an important role to obtain hand speed from our previous research, perturbation of each joint angular velocity was given to the term to analyze the sensitivity of the angular velocities in the motion-dependent term. From the results obtained in this study, the subjects with large hand speed showed large contribution of the motion-dependent term to the speed. The subjects pulled shoulder and elbow joints upward in the forward swing phase and extended the elbow joint quickly for obtaining the hand speed.
2008-11-05