Elucidation of basic mechanism of sports movement based on mechanical models and its application to physics education

在体育运动中有各种各样的教练理论，其中大多数都没有用客观或科学的语言来描述。在这项工作中，我们提出了一种理论方法来阐明基于刚体力学的基本机制，适用于各种运动。具体来说，我们考虑棒球和剑道的投掷动作，并试图将结果应用于体育教练和物理教育。我们指出了重力、惯性力、肌肉恢复力和肌肉收缩反作用力的混合效应的重要性，这些效应通常是不被注意的。

In sports there are various coaching theories, most of which are not described with objective or scientific words. In this work we propose a theoretical method to elucidate basic mechanisms based on rigid-body mechanics, which is applicable to various sports movements. Specifically we consider throwing motion in baseball and men-uchiin kendo, and try to apply the results to sports coaching and physics education. We show the importance of hybrid effects of gravity, inertial force, restorative force of muscles and reaction of muscle contraction, which are usually unnoticed.