外野からの送球における ... - sports-performance.jp

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2 , , , . , , , , . , 7, 267-277 2015 :2015 6 16 :2015 10 5 891-2393 1 * * * * * Effects of a teaching and matawari training program for increasing the speed of balls thrown from the outfield in baseball Masahiro Kageyama1), Masafumi Fujii1), Chiharu Suzuki2), Akira Maeda1), 1) National Institute of Fitness & sports in Kanoya 2) Graduate School, National Institute of Fitness and sports in Kanoya Key words.

3 Throwing a ball, throwing motion, approach stride, step, weight shift , 7, 267-277, 2015 268 [Abstract] The participant in the present research was a university baseball outfield player whose problem was that when throwing the ball from the outfield, the span of his step before the acceleration phase from landing on the stepping foot to releasing it was too small to get sufficient momentum in the direction of the throw. The present study tested a teaching program and matawari training for expanding the travelling distance of his approach stride, aiming at eventually increasing the speed of the thrown ball.

4 Matawari is a form of exercise in which the athlete sits on the ground with his legs wide apart, and then lowers his torso to touch the ground between his legs. After the training, the speed of balls thrown increased from km/h when measured before the teaching and training program to km/h at the first measurement after the teaching and training program, and to km/h at the second measurement after the training. Also after the teaching and matawari training program, the displacement of the athlete s throwing motion increased in the first preparation period (from the start of the motion with his left foot with 0 step to landing on his left foot) and in the second preparation period (from the first step of his left foot to landing on his right foot).

5 At each period after the teaching program, no change in his motion was observed, but in the acceleration phase, the extension motion of the knee of his stepping leg and the forward lean of the trunk of his body improved after the matawari training. The present results suggest that this teaching and training program may be effective for baseball players whose step span before landing on their stepping foot is too small for them to be able to get momentum in the direction of their throw. , 7, 267-277, 2015 269 I 1.

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