A study of some method of protecting damage of hamate bone at baseball hitting ; including connection with the batting skill

在这个项目的主要研究中，我们检查了“手指握拍”（正常握拍）和“手掌握拍”（将球棒的旋钮握到击球手的手掌中）的击球手，以了解以下两件事。1)击球手掌骨钩与握拍之间的距离2)击球手击球时掌骨钩所在的掌面所受的压力，结果我们看到，1)采用“掌握”时，球钩与握拍之间的距离为10毫米，约为“指握”时的一半；2)采用“掌握”时，球钩与握拍之间的距离为10毫米。在击球的情况下，施加在手掌表面的压力大约是“手指握球”时的两倍，并且在“手掌握球”的情况下，施加在手掌上的压力尤其大。另外，根据高速视频拍摄的数据，求解了球棒运动方程，计算了双手对球棒的作用力。所以古巴和日本击球手的击球数据用这个表达式来计算。此外，根据计算出的物理值，以及为了比较而计算出的其他指标，对两者的击球技术进行了比较。结果表明，在每个击球手的击球技巧上，有一些差异，可以定量地说。

In main study of this project we examined batters with 'finger grip' (a normal grip) and batters with 'palm grip' (grasping a knob of a bat into batter's palm) to know the following two things.1) the distance between the hook of hamate bone of the batter and the grasped bat2) the pressure applied to the surface of his palm, under which the hook of hamate is located, when the batter hits a ball, As a result we have seen that,1) employing 'palm grip', the distance between the hook and the grasped bat is 10mm. which is about half that of 'finger grip',2) employing 'palm grip', the pressure applied to the surface of his palm in the instance of hitting a ball is about double of that with 'finger grip', and3) in the case of foul tip with 'palm grip', the pressure applied to the palm is especially higher.In additional the motion equation concerning the movement of a bat was solved to calculate the power added to the bat by both hands from the data of a high-speed video shooting. So Cuban and Japanese batter's batting data were calculated in this expression. In addition, the batting skill of both was compared based on the calculated physical value, and other indexes that were calculated for the sake of comparison. As a result, it was clarified that in the batting skill of each batter there were some differences to speak quantitatively.