Some explication of skills in baseball batting

本研究的主要目的是了解技巧性击球动作，阐明实现技巧性击球动作的技术，并探索技巧性击球动作的研究方法。二是分析空气阻力对飞球的影响。对于后者，我们将实际飞行距离与假设在真空中飞行的击球的初始速度计算的距离进行了比较。在我们的实验中，后者的平均值为78.8m，而前者的平均值为96.7m，在垂直方向上与初速的散度平均为20.0m。(1)在古巴受试者中，蝙蝠在水平面上的摆动轨迹看起来像一个卵形椭圆形，而在日本受试者中则相反，比如新月形。前者延伸到投球来的方向。(2)从前摆动开始到落地的时间(摆动时间)，古巴受试者为Short…更多的估计。在挥杆时间较长的受试者中，蝙蝠在起跑时的轨迹几乎呈两个扇形，其中一个竖直地堆积在另一个顶点上，无论是在水平面上还是在垂直平面上。在挥杆时间短的受试者中，它们的连接点在球拍头部附近，或者轨迹呈近似三角形的形状。(3)在臀部动作的时间上，日本人从挥杆的第一阶段开始，古巴人在击球前开始。古巴人的挥杆风格是像弹簧一样摆动自己的身体，日本人的身体像鞭子一样摆动。因为，在弹簧中，一侧是固定的，在运行之前，能量已经被储存。但在一侧移动后的鞭子中，能量因此而储存。(4)古巴受试者在前摆时开始由内向外、向下适度移动握力，向肩肘握力平面的前侧方向移动，逐渐向平面的正常方向移动。但这一特征在一些日本受试者身上是相同的。较少

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