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最終更新日：2024/04/17

森下義隆

モリシタヨシタカ (Yoshitaka Morishita)

論文

タイトル
タイトル（英）: Relationship between impact characteristics and launch direction in softball hitting: A study involving elite players
参照URL: https://researchmap.jp/read0144454/published_papers/35968398
著者
著者（英）: Shuji Kidokoro,Yoshitaka Morishita
担当区分
概要
概要（英）: In the game of softball, the batter should possess the necessary skills to hit the ball toward various directions with high initial speed. However, because various factors influence each other, there are limitations to the range that can be controlled by the batter’s skill. This study was aimed at extracting the impact characteristics associated with the launch speed/direction and batted ball spin and clarifying the important skills required to improve the batter’s hitting performance. In our experiments, 20 female softball players, who are members of the Japan women’s national softball team, hit balls launched from a pitching machine. The movements of the ball and bat before, during, or after the impact were recorded using a motion capture system. Stepwise multiple regression analysis was performed to extract factors relating the side spin rate. The undercut angle (elevation angle between the bat’s trajectory and the common normal between the ball and bat: ΔR² = 0.560) and the horizontal bat angle (azimuth of bat’s long axis at ball impact: ΔR² = 0.299) were strongly associated with the side spin rate (total R² = 0.893, p < 0.001). The undercut angle in opposite-field hitting was significantly larger than that in pull-side hitting (p < 0.001). The side spin rate was associated with the undercut angle because the bat’s distal (barrel) side inclined downward (–29.6 ± 8.7°) at impact. The ball exit velocity was higher when it was hit at a smaller undercut angle (R² = 0.523, p < 0.001). Therefore, it is deemed desirable to focus on maximizing the ball exit velocity rather than ball spin because the ball–bat impact characteristics vary inevitably depending on the launch direction. Meanwhile, the use of the ball delivery machine and the slower pitched ball are the limiting factors in the generalization of the findings.
出版者・発行元
出版者・発行元（英）: Public Library of Science (PLoS)
誌名
誌名（英）: PLOS ONE
巻: 16
号: 11
開始ページ: e0260520
終了ページ: e0260520
出版年月: 2021年11月30日
査読の有無: 査読有り
招待の有無
掲載種別: 研究論文（学術雑誌）
ISSN
DOI URL: https://doi.org/10.1371/journal.pone.0260520
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森下 義隆

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森下義隆