429 Relative contribution of upper limb joint torques to the generation of bat head speed in baseball batting

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  • 429 野球打撃動作におけるヘッドスピード生成に対する上肢関節の順動力学的貢献

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The purpose of this study was to quantify the contribution of the kinetics variables, such as the upper limb joint torques, shoulder joint inter-segmental forces, and motion dependent term, to the bat head speed during baseball batting motion. The upper limb segments and bat were modeled as a seven-rigid-segment system, and each elbow joint was modeled as a one-axis revolute joint to consider the degree of freedom (DOF) of the joint The equation of motion associated with the upper limbs and bat was obtained from the equation of motion for each segment and from equations for constraint condition in which adjacent segments are connected by joint The relative dynamic contributions of the joint moments, shoulder joint force, motion dependent term and gravity term to the bat head speed were derived from the dynamic equation of the system. From the results obtained in this study, the motion dependent term make significant role for generation of the bat head speed during forward swing motion in baseball batting, and the shoulder joint torque of the knob-side upper limb showed a large contribution to the head speed.

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