A-46 バットヘッドコントロールに関する上肢の順動力学的分析(野球4(打撃))

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  • A-46 A forward dynamic analysis of controlling bat motion
  • バットヘッドコントロールに関する上肢の順動力学的分析
  • バットヘッドコントロール ニ カンスル ジョウシ ノ ジュン ドウリキガクテキ ブンセキ

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The purpose of this study was to quantify the contribution of the upper limb joint torques and shoulder joint reaction force to the bat head speed and to the vertical component of the bat head velocity during baseball batting motion. The upper limb segments and bat were modeled as a system of seven-rigid linked segments, and constraint axes of the elbow and wrist joints were modeled with constraint equation in order to consider the degree of freedom (DOF) of the joint Each hand was considered to be connected with the bat through zero DOF joint The equation of motion with respect to the upper limbs and bat was obtained from 1) the equation of motion for each segment, 2) equations for constraint condition in which adjacent segments are connected by joint, and 3) equations for constraint axes of joints. The dynamic contributions of the joint moments, shoulder joint force, motion dependent term and gravity term to the bat head speed and vertical component of the bat velocity were derived from the dynamic equation of the system. A recurrent equation with respect to the generalized velocity vector of the system is derived to calculate the contribution of the joint torque terms, external joint force term, and gravity term to the motion dependent term. Collegiate male baseball players' motion were captured by VICON 612 system (9 cameras, 250Hz) and kinetic data of each hand were collected with an instrumented bat with strain gauges (1000Hz). From the results, the joint torque of knob side shoulder shows large contribution to generate head speed, and the torque generates large downward velocity in the vertical direction.

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