Middle finger and ball movements around ball release during baseball fastball pitching
Middle finger and ball movements around ball release during baseball fastball pitching
复制标题
DOI：
10.1080/14763141.2016.1261932
复制
发表时间：
2018-01-01
影响因子：
2.2
通讯作者：
Kumagawa, Daisuke
中科院分区：
文献类型：
--
作者：
Matsuo, Tomoyuki;Jinji, Tsutomu;Kumagawa, Daisuke
本研究旨在探讨棒球投手投球过程中，中指在投球瞬间的动作与投球动态。14名半职业投手从室内投手丘投球的过程是用16台高速摄像机（1,000 Hz）的动作捕捉系统捕捉到的。计算中指关节的运动学、球旋转和施加到球的力。近端和远端指间关节继续伸展，直到球释放的瞬间，然后突然屈曲。突然的屈曲只持续了几毫秒，随后是一个短暂的伸展阶段。手指做了一个快速的伸展-屈曲运动的双循环，这表明它获得了高刚度，由于共同收缩。由于近端指间关节开始伸展或伸展角速度增加，在球释放前8 +/-1 ms，球开始卷起至指尖。在球开始滚动的同时，向手的近端方向施加195 +/-27 N的平均力，并在球释放前向投掷方向施加109 +/-22 N的平均力。
The objectives of this study were to investigate middle finger movements and dynamics of ball movements around the instant of ball release during baseball pitching. Baseball pitching from an indoor mound among 14 semi-professional pitchers was captured using a motion capture system with 16 high-speed cameras (1,000Hz). Kinematics of middle finger joints, ball rotation, and force applied to the ball were calculated. The proximal and distal interphalangeal joints continued to extend until the instant of ball release, then abruptly flexed. The abrupt flexion lasted for only several milliseconds, followed by a short extension phase. The finger made a quick double cycle of extension-flexion movement, suggesting that it attained high stiffness resulting from co-contraction. The ball began to roll up to the tip of the finger 8 +/- 1ms before ball release owing to the start of extension or the increased angular velocity of extension for the proximal interphalangeal joint. A mean force of 195 +/- 27N was applied in the proximal direction of the hand at the same time as the beginning of ball rolling, and a mean force of 109 +/- 22N was applied to the throwing direction just before ball release.