Tabuchi Noriyuki, Matsuo Tomoyuki, Hashizume Ken
Graduate School of Human Sciences, Osaka University, Japan.
Sports Biomech. 2007 Jan;6(1):17-30. doi: 10.1080/14763140601058409.
The aims of this study were to examine whether batters hit stationary balls at the time of peak speed of the bat head and whether the impact occurs at the lowest point of the bat trajectory. Eight university baseball players hit three balls, each hung with a string; each ball was made of a different material and was different in weight. Bat movement was captured by four 240-Hz infrared cameras and analysed three-dimensionally. Time for peak speed of the bat head varied according to the conditions. When stationary balls of standard weight were used, the bat head was at maximum speed at impact with the ball; then, it decelerated drastically owing to the impact. In contrast, maximum speed was obtained after impact when lightweight stationary balls were used. The time-speed profile of the bat head before impact in the lightweight ball condition was identical with that in the standard weight ball condition. Regardless of conditions, the timing of the lowest point of the bat head was nearly identical for each batter and most participants hit the stationary balls at about the lowest point of the bat trajectory.
本研究的目的是检验击球手是否在棒头速度峰值时击打静止球，以及撞击是否发生在球棒轨迹的最低点。八名大学棒球运动员击打了三个用绳子悬挂的球；每个球由不同材料制成，重量也不同。球棒运动由四个240赫兹的红外摄像机捕捉，并进行三维分析。棒头达到峰值速度的时间因条件而异。当使用标准重量的静止球时，棒头在与球撞击时处于最大速度；然后，由于撞击，它急剧减速。相比之下，当使用轻质静止球时，撞击后获得最大速度。轻质球条件下棒头撞击前的时间-速度曲线与标准重量球条件下相同。无论条件如何，每个击球手棒头最低点的时间几乎相同，并且大多数参与者在球棒轨迹的最低点附近击打静止球。
