Some explication of skills in baseball batting

本研究的主要目的在于了解技术性击球动作，并探讨其技术实现的方法。其次分析空气阻力对飞球的影响.对于后者，我们比较了实际的飞行距离和距离，这是计算的初始速度击球假设在真空中飞行。在我们的一次实验中，后者的平均值为78.8米，前者的平均值为96.7米。在垂直方向上，对初速度的发散平均为20.0m。(1)古巴人的蝙蝠在水平面上摆动的轨迹看起来像一个卵椭圆形，而日本人的蝙蝠在水平面上摆动的轨迹看起来像一个新月形。前者延伸到投球来的方向。(2)至于从开始向前挥拍到击球的时间（挥拍时间），古巴队的受试者最短 ...更多信息 est.在长挥杆时间的受试者中，球棒通过起跑的轨迹几乎呈两个扇形，其中一个扇形直立地堆积在另一个扇形的顶点上，无论是在水平面还是在垂直平面上。在短挥击时间的受试者中，这些轨迹的连接点在球棒头部附近，或者轨迹呈近似三角形。(3)在髋关节运动的时间方面，日本受试者在挥杆的第一部分开始，古巴受试者在撞击之前开始。古巴人的摇摆风格是像弹簧一样移动自己的身体，日本人的摇摆风格像鞭子一样。因为，在弹簧中，一侧是固定的，并且在操作之前，能量已经被存储。（4）古巴受试者在向前挥拍时，握拍开始时是由内向外、由下向上，并逐渐向肩肘握拍平面的前侧和平面的法线方向移动。但这一特点是共享与一些日本科目。少

The main purpose Of this Study is to understand skillful batting motions and to explicate the skills which actualized them, and also to search the research method for them. The Secondary purpose to analyze the effect of the air resistance to a fly ball. For the latter, we compared the actual flying distance and the distance which was calculated on initial velocity of a batted ball supposing to fly in a vacuum. In our an experiment, the latter average was 78.8 m for the former average of 96.7 m. And the divergence in vertical direction to that of initial velocity was the average of 20.0 m.The main result for the main purpose are as follows. (1) The trajectories of a bat in Cuban subjects look like an egg-oval throughout a swing in the horizontal plane, contrarily in Japanese subjects like the crescent-shaped. the former is extended to the direction that the pitched ball is coming. (2) As to the times from the start of forward swing to the impact (swing-time), Cuban subjects is the short … More est. In the subjects with long swing-time, the trajectories of a bat through the start take the shape of almost two fan, one of which is piled up upright on another one's apex, either in the horizontal plane and in the vertical plane. In the subject with short swing-time the joining point of those is near the head of bat, or the trajectories take the shape of almost an triangle. (3) In terms of the timing of the hip movements, Japanse subjects started in the first part of the swing, and Cuban subjects just before the impact. The style of swing in Cuban subjects is to move their own body like a spring, for that of Japanese subjects like a whip. For, in a spring one side is fixed, and before the operation the energy has been stored. But in a whip after one side moved, the energy is stored because of it. (4) Cuban subjects started their grip moving moderately inside-out and moderately down at forward swing, and to do them toward the front side of shoulder-elbow-grip plane and gradually to the normal direction to the plane. But this features are shared with some Japanese subjects. Less