Kusafuka Ayane, Kobayashi Hirofumi, Miki Takeshi, Kuwata Masumi, Kudo Kazutoshi, Nakazawa Kimitaka, Wakao Shinji
Department of Life Science, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
Department of Science and Engineering, Waseda University, Tokyo, Japan.
Front Sports Act Living. 2020 Apr 15;2:36. doi: 10.3389/fspor.2020.00036. eCollection 2020.
This study explored the mechanical factors that determine accuracy of a baseball pitching. In particular, we focused on the mechanical parameters at ball release, referred to as release parameters. The aim was to understand which parameter has the most deterministic influence on pitch location by measuring the release parameters during actual pitching and developing a simulation that predicts the pitch location from given release parameters. By comparing the fluctuation of the simulated pitch location when varying each release parameter, it was found that the elevation pitching angle and speed significantly influenced the vertical pitch location, and the azimuth pitching angle significantly influenced the horizontal pitch location. Moreover, a regression model was obtained to predict the pitch location, and it became clear that the significant predictors for the vertical pitch location were the elevation pitching angle, the speed, and spin axis, and those for the horizontal pitch location were the azimuth pitching angle, the spin axis, and horizontal release point. Therefore, it was suggested that the parameter most affecting pitch location weas pitching angle. On the other hand, multiple regression analyses revealed that the relation between release parameters varied between pitchers. The result is expected to contribute to an understanding of the mechanisms underlying accurate ball control skill in baseball pitching.
本研究探讨了决定棒球投球准确性的力学因素。具体而言，我们关注球出手时的力学参数，即出手参数。目的是通过在实际投球过程中测量出手参数，并开发一个能根据给定出手参数预测投球位置的模拟模型，来了解哪个参数对投球位置具有最决定性的影响。通过比较改变每个出手参数时模拟投球位置的波动情况，发现仰角投球角度和速度对投球的垂直位置有显著影响，方位角投球角度对投球的水平位置有显著影响。此外，还获得了一个预测投球位置的回归模型，结果表明，对垂直投球位置有显著影响的预测因子是仰角投球角度、速度和旋转轴，而对水平投球位置有显著影响的是方位角投球角度、旋转轴和水平出手点。因此，有人提出对投球位置影响最大的参数是投球角度。另一方面，多元回归分析表明，出手参数之间的关系在不同投手之间存在差异。这一结果有望有助于理解棒球投球中精确控球技巧背后的机制。
