Morishita Yoshitaka, Jinji Tsutomu
Department of Sports Research, Japan Institute of Sport Sciences, Kita-ku, Tokyo 115-0056, Japan.
Department of Health and Sports, Niigata University of Health and Welfare, Niigata 950-3198, Japan.
Sports (Basel). 2022 Feb 6;10(2):21. doi: 10.3390/sports10020021.
In baseball, the swing speed and swing angle of the bat just before ball impact are important to increase the speed and horizontal distance of a batted ball. This study investigated the accuracies and error trends of four commercially available bat sensors to measure these parameters. The hitting motions of seven healthy participants were measured simultaneously using the bat sensors and an optical motion capture system, and the swing speeds and swing angles were compared. The swing speed was measured with high accuracy, as indicated by the high intraclass correlation coefficient (ICC) between the bat sensor and the motion capture system measurements (mean ICC = 0.78). However, the ICC for the swing angle was lower (mean ICC = 0.58) than that of the swing speed for all but one bat sensor, indicating low accuracy. Moreover, in the high swing speed range, the accuracy of the swing speed tended to decrease for three bat sensors, but the trend of the swing angle was different among bat sensors. Significant systematic biases or proportional errors were found for all bat sensors, indicating the possibility of error correction. The sensor used in this study can help to evaluate the differences between players with different competition levels and hitting motions. Coaches need to be cautious in taking measurements of players with high swing speeds and in assessing slight changes within an individual.
在棒球运动中，球棒在击球前的挥棒速度和挥棒角度对于提高击球的速度和水平距离至关重要。本研究调查了四种市售球棒传感器测量这些参数的准确性和误差趋势。使用球棒传感器和光学动作捕捉系统同时测量了七名健康参与者的击球动作，并比较了挥棒速度和挥棒角度。球棒传感器与动作捕捉系统测量结果之间的组内相关系数（ICC）较高，表明挥棒速度的测量精度较高（平均ICC = 0.78）。然而，除了一个球棒传感器外，所有球棒传感器的挥棒角度ICC均低于挥棒速度的ICC（平均ICC = 0.58），表明精度较低。此外，在高挥棒速度范围内，三个球棒传感器的挥棒速度精度趋于下降，但不同球棒传感器的挥棒角度趋势有所不同。所有球棒传感器均发现了显著的系统偏差或比例误差，表明存在误差校正的可能性。本研究中使用的传感器有助于评估不同竞争水平和击球动作的球员之间的差异。教练在测量高挥棒速度的球员以及评估个体内部的细微变化时需要谨慎。
