著者

勝又 宏 川合 武司

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.40, no.6, pp.381-398, 1996-03-10 (Released:2017-09-27)

被引用文献数

7

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This study was designed to examine how baseball batters adjust their batting actions to slow-speed and fast-speed pitches by measuring the ground reaction forces. The followings were revealed during different phases of the batting action. 1) At the take-back motion phase, the weight was transferred onto the catcher-side foot. The ground reaction force of the left foot, i.e., the pitcher-side foot, was increased immediately to fix the left foot firmly on the ground at the bat-swing phase. 2) In batting the slow-speed pitches, fixing the stepped left foot on the ground was remained momentarily before the bat-swing action. 3) In batting the slow-speed and fast-speed pitches, the ground reaction force curves of the left foot at the bat-swing phase were almost the saae. 4) The bat swing was started after fixing the left foot on the ground. 5) In each batting for the slow-speed and the fast-speed pitches which were mixed at random, the beginnig-phases of the batting motions were started at the almost same time. These analyses suggest the followings: 1)Ddecision on hitting the pitch is made before fixing the stepped foot firmly on the ground. 2)By momentary fixation of the stepped foot on the ground, the bat-swing action is synchronized to the pitch for correctly timed hitting. 4)When it is difficult for batters to predict whether the next pitch will be fast-speed or slow-speed, batters' actions may be prepared to hit the fast-speed pitches. And when the pitched ball is slow-speed, batters may adjust the start of the bat-swing action by momentary fixation of the stepped foot on the ground.

著者

兵頭 圭介 勝又 宏 川本 竜史 只隈 伸也 田中 博史 中間 和男 中村 正雄 宮城 修

出版者

大東文化大学

雑誌

大東文化大学紀要. 社会科学・自然科学 (ISSN:09122338)

巻号頁・発行日

vol.44, pp.209-228, 2006-03-31

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Educational and research activity of physical education teaching staffs in Daito Bunka University were assessed by Corporation of the University Physical Education (Japan). Data for assessment were obtained from reports published in The Bulletin of Daito Bunka University and other published reports by Daito Bunka University. Physical education teaching staffs in Daito Bunka University were highly evaluated and awarded a prize of model for promoted faculty development in physical education. The performance of physical education teaching staffs were well improved by establishment of the Department of Sports and health sciences at Daito Bunka University in 2005.