Jump ability in relation to ball speed during windmill pitching by female softball pitchers:

KARIYAMA Yasushi, TOYODA Ayano, FUJII Hiroaki

doi:10.5432/jjpehss.21056

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Other Title

女子ソフトボール投手におけるウィンドミル投法の投球スピードに関連するジャンプ能力：
女子ソフトボール投手におけるウィンドミル投法の投球スピードに関連するジャンプ能力 : 軸脚による身体重心速度と踏込脚による地面反力に着目して
ジョシソフトボールトウシュニオケルウィンドミルトウホウノトウキュウスピードニカンレンスルジャンプノウリョク : ジクキャクニヨルシンタイジュウシンソクドトフミコミキャクニヨルジメンハンリョクニチャクモクシテ
focus on velocity of the center of gravity by the pivot leg and ground reaction force of the stride leg
軸脚による身体重心速度と踏込脚による地面反力に着目して

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Abstract

The velocity of the center of gravity of the pivot leg and the ground reaction force of the stride leg during windmill pitching are critical for ball speed. The aim of this study was to investigate jump ability in relation to the velocity of the center of gravity of the pivot leg and the ground reaction force of the stride leg. Seven female softball pitchers performed windmill pitching and various jump tests: countermovement jump, standing long jump (SLJ), rebound jump (RJ), and one-step approach single-leg vertical jump (AVJ). The results obtained were as follows.<br> 　1） No significant relationship between the ball speed during windmill pitching and jump ability was observed in any of the jump tests.<br> 　2） The velocity of the center of gravity of the pivot leg was significantly correlated with SLJ and RJ ability.<br> 　3） The vertical and horizontal negative impulses (ground reaction force) during windmill pitching were significantly correlated with those in the AVJ.<br> 　These results demonstrated that the velocity of the center of gravity of the pivot leg and the ground reaction force of the stride leg—which, as demonstrated in previous studies, are crucial in determining the ball speed during windmill pitching—were correlated with jump ability. Moreover, the relationship between jump ability and the velocity of the center of gravity of the pivot leg and that between jump ability and the ground reaction force of the stride leg differed.

Journal

Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences)

Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences) 67 (0), 25-34, 2022

Japan Society of Physical Education, Health and Sport Sciences

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