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Some explication of skills in baseball batting

棒球击球技巧的一些解释

基本信息

批准号：
05451134
负责人：
OHMURA Toru
金额：
$ 2.56万
依托单位：
Chiba-Keizai College Department of Elementary Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05451134/
关键词：
Batting skill in Baseball 3-dimensional motion analysis Trajetory of bat movement Cuban batter and Japanese batter 打撃運動の評価バット運動軌跡の形態打球軌道予測

项目摘要

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

本研究的主要目的是了解熟练的击球动作并阐明实现这些动作的技巧，并探索其研究方法。第二个目的是分析空气阻力对飞球的影响。对于后者，我们比较了实际飞行距离和假设击球在真空中飞行时根据击球初速度计算出的距离。在我们的实验中，后者的平均值为 78.8 m，前者的平均值为 96.7 m。垂直于初速度方向的散度平均为20.0 m。主要目的的主要结果如下。 (1) 在古巴受试者中，蝙蝠在水平面上摆动的轨迹看起来像一个鸡蛋椭圆形，而在日本受试者中，蝙蝠的轨迹则像新月形。前者延伸到投球来的方向。（2）从向前挥拍开始到击球的时间（挥拍时间），古巴受试者是最短的，而在挥拍时间较长的受试者中，球棒从开始的轨迹几乎呈两扇扇形，其中一个扇形竖立在另一个扇形的顶点上，无论是水平面还是垂直面。在挥杆时间短的对象中，它们的接合点靠近球棒的头部，或者轨迹几乎呈三角形。 (3)从臀部动作的时机来看，日本受试者在挥杆的第一部分开始，而古巴受试者则在撞击之前。古巴人的摆动方式是像弹簧一样移动自己的身体，而日本人的摆动方式是像鞭子一样移动自己的身体。因为，弹簧的一侧是固定的，并且在操作之前能量已经被存储。但在鞭子的一侧移动后，能量会因此被储存起来。 (4) 古巴受试者开始握杆由内向外适度移动，向前摆动时适度向下，并朝肩肘握平面的前侧进行，并逐渐向该平面的法线方向进行。但一些日本科目也有这个特征。较少的