Cross-sectional comparison of the probabilistic structure in the distribution of pitching location among baseball pitchers of different ages
Cross-sectional comparison of the probabilistic structure in the distribution of pitching location among baseball pitchers of different ages
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不同年龄棒球投手投球位置分布概率结构的横截面比较
DOI：
10.1080/14763141.2020.1822908
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发表时间：
2020
影响因子：
2.2
通讯作者：
Nakazawa Kimitaka
中科院分区：
文献类型：
--
作者：
Ogawa Tetsuya;Kobayashi Hirofumi;Kuwata Masumi;Obata Hiroki;Shinya Masahiro;Ijiri Tetsuya;Miki Takeshi;Nakazawa Kimitaka
本研究是一个横截面比较概率结构的分布在不同年龄组的棒球投手（25小学（ES），20初中（JH），15高中（HS）和18大学生（CL））。在结果中，尽管一般的年龄依赖性的变化在俯仰精度，差异不仅反映在错误的“大小”，但也在“形状”的错误，因为它是通过拟合95%的置信椭圆的二维分布的俯仰位置。虽然作为释放时间（椭圆的长轴长度）的试验-试验可变性的反映的精度测量是恒定的，但作为每个参与者的投球形式的可变性的反映的椭圆的短轴长度在组间表现出显著差异。特别是在ES组中，投掷臂轨迹角的试验变异性与短轴长度显著相关;这种相关性远远大于老年组。本研究是第一个展示的详细结构的变化，棒球投手的位置依赖于年龄。
The present study was a cross-sectional comparison of probabilistic structure in the distribution of pitching location among baseball pitchers of various age groups (25 elementary school (ES), 20 junior high school (JH), 15 high school (HS), and 18 college students (CL)). In the results, despite the general age-dependent variations in pitching precision, the difference was reflected not only in error ‘size’ but also in the ‘shape’ of error as it was shown by fitting 95% confidence ellipse to the two dimensional distribution of pitch location. While the precision measure as a reflection of trial-by-trial variability of release timing (major axis length of the ellipse) was constant, minor axis length of the ellipse as a reflection of variability in the pitching form of each participant demonstrated significant differences among the groups. In the ES group particularly, the trial-by-trial variability in the trajectory angle of the throwing arm was significantly correlated with the minor axis length; this correlation was far greater than those in older groups. The present study is the first to demonstrate the detailed structure of the variability of pitching location of baseball dependent on age.