文献一覧: 川端浩一 (著者)

2 0 0 0 OA 365. 上体起こし運動に及ぼす膝の伸展位と屈曲位姿勢の影響(トレーニング, 第61回日本体力医学会大会)

著者: 川端浩一澤山純也金子公宥
出版者: 日本体力医学会
雑誌: 体力科學 (ISSN:0039906X)
巻号頁・発行日: vol.55, no.6, 2006-12-01

2009-03-12 21:35:27
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https://ci.nii.ac.jp/naid/110006288519

1 0 0 0 OA グリップ位置と投球速度の違いが野球のバットスイングに及ぼす影響

著者: 川端浩一伊藤章
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: pp.11097, (Released:2012-09-29)
参考文献数: 17
被引用文献数: 5 1

A study was conducted to investigate differences in bat swing between the use of long and short bat grip positions. Fifteen male baseball players were videotaped at 250 Hz using two high-speed video cameras while they were batting balls placed on a batting tee and pitched at 80, 100, and 120 km/h by a pitching machine. The bat head and grip end were digitized, and the three-dimensional coordinates were calculated using the direct linear transformation (DLT) method. Bat head velocity at impact employing the long grip position was significantly higher than that when the short grip position was used, but grip velocity and bat angular velocity at impact employing the short grip position were significantly higher than those when the long grip position was used, independent of pitching speed. These findings suggest that bat head velocity at impact was affected mainly by the radius of gyration. Bat head velocity at impact using both grip positions decreased significantly as pitching speed increased. This may have reflected the efforts of the players to improve batting accuracy, since the bat head velocity at impact was significantly lower for the short grip position than for the long grip position at all pitching speeds. These results regarding the relationship between speed and accuracy indicate that the short grip position is advantageous for improving batting accuracy.