LOWER BODY SIMULATION ANALYSIS ON INCREASING ROTATIONAL VELOCITY OF LOWER TRUNK IN BASEBALL TEE BATTING

Kazumichi Ae, Sekiya Koike, Norihisa Fujii, Michiyoshi Ae

Abstract


The aim of this study was to investigate optimum timings of joint toques of the lower extremities in order to generate larger angular velocity of the lower trunk through baseball tee bating. A lower body seven-segment computer simulation model was developed. The model has totally 17 active torque generators at individual hip, knee and ankle joints, and torso joint. The optimisation procedure for the performance improvement was carried out by varying timings of exerting joint torques to maximise the peak forward angular velocity of the lower trunk about the vertical axis. The difference in exerting timing of the hip and knee joint torques of the stride leg contributed to increasing the peak angular velocity of the lower trunk, and that of the pivot hip flexion/extension joint toque prior to the impact contributed to the inhibition of the excessive rotational movement of the lower trunk.

Keywords


torque-driven simulation; optlmlsatlon; lower trunk

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ISSN 1999-4168