著者

小田 伸午 森谷 敏夫 田口 貞善 松本 珠希 見正 冨美子

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.36, no.3, pp.255-262, 1991-12-01 (Released:2017-09-27)

被引用文献数

5 2

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The purpose of this study was to investigate tee-batting skills in relation to ground reaction forces. Eithteen batters tried seven swings on the force platform recording three-dimensional kinetic data. A video camera (60 fps) was used to measure ball velocity and swing velocity. The following results were obtnined. 1) A statistically significant correlation was observed between the swing velocity and the swing time. 2 Statistically significant correlations were observed between the swing velocity and the anteroposterior forces during backward swing phase, the mean power calculated from the anteroposterior force during forward swing phase. 3) Statistically significant correlations were obtained betwben the swing velocity, the ball velocity and the mediolateral distance of the CG of the body from the starting position during backward swing phase. 4) The swing velocity and the ball velocity significantly correlated with the mediolateral distance of the CG of the body between the starting phase and the impact phase. 5) Coefficient of variations (cv) of the vertical forces during backward swing phase and the mean power calculated from the vertical force significantly correlated with cv of the swing velocity. CV of the vertical power of the CG of the body significantly correlated with cv of the ball velocity. These findings suggest that the batter should move the body toward the opposite side of the ball and the anterior direction just before the starting phase of the forward swing to obtain the high swing velocity. The result also suggests that the batter should control the vertical movement during backward and forward swing to obtain the high reproducibility of batting.

著者

山崎 先也 岡本 啓 松久 ミユキ 野原 隆司 田口 貞善

出版者

日本運動生理学会

雑誌

日本運動生理学雑誌 (ISSN:13403036)

巻号頁・発行日

vol.8, no.2, pp.99-105, 2001-10-31

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The purpose of this study was to compare the bone turnover between eleven young female rhythmic sports gymnasts(aged 19-21 yr.)and nine sedentary control female subject(aged 21-22 yr.). The gymnasts were training 4-6 hours per day, 7 times per week with dieting. Bone turnover was assesed using speciific biomarkers of formation(serum intact osteocalcin)and resorption(the 24 hours urinary deoxypyridinoline). The gymnasts had significantly lower percent fat and body weights than the control females. The gymnasts showed significantly lower levels of serum calcium but slightly higher urinary calcium concentrations compared with the controls. The gymnasts had significantly higher bone resorption and lower bone formation compared with the control females. The findings suggest that an increased bone resorption in the female rhythmic sports gymnasts may cause loss of bone mass which was probably due to the vigorous exercise training under dieting regimes.

著者

小河 繁彦 山崎 先也 岡本 啓 福田 俊 家森 幸男 田口 貞善

出版者

日本生理学会

雑誌

日本生理学雜誌 (ISSN:00319341)

巻号頁・発行日

vol.57, no.10, pp.419-426, 1995-10

被引用文献数

4

著者

田口 貞善 秦 優子

出版者

杏林書院

雑誌

体育の科学 (ISSN:00398985)

巻号頁・発行日

vol.33, no.4, pp.p305-309, 1983-04