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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국체육과학회 한국체육과학회지 한국체육과학회지 제18권 제2호 (자연과학편)
발행연도
2009.5
수록면
1,367 - 1,378 (12page)

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초록· 키워드

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Through the study on the development of an effective swing motion for a left-handed softball player, we can get the conclusion as below. 1. In each step, superior players make sliding time slow while they make the stride length wider than their own shoulder width. Taking the stable pose, they do make fast movement till the impact which is followed by natural throw movement. 2. If the nose moves up and down largely, players can make more accurate hitting. Because the time that takes to reach the impact moment from pitchers' throwing that occurs 13.11m away is very short. In the 2nd and 3rd period of swing, the less nose movenment is, the better body balance occurs, which makes higher possibility for a good swing. 3.It is recommendable to make stride length wider than width of own shoulders but if that is too wider, it is hard to give the enough strength to swing because of the swing motion that is naturally formed. 4.In each step, the velocity(Y) after and before the change of maximum one of center of mass was made when the left handed player made his or her right leg stride while the center of mass or power point moved to the left leg by revolving his/her trunk such as shoulders and waist and move the center of mass to home plate direction, which is followed by simple swing pulled back in order to concentrate the force. In case of vertical velocity(Z), it is necessary to extend the right foot forward from the impact to follow swing and upright the upper body to get the maximized change of velocity.5.When it comes to the velocity of a bat, average players' group makes the maximum one which is 0.017 sec after impact while superior players' group makes it before the impact. 6. An accurate bat could arise when the angle of that levelled out with the X axis. Also, if the angle of trunk is moving too much backward or forward, the balance between trunk and legs is unstable, which makes a player not see the ball until the last moment. That makes the shoulders lose the balance faster, which means it is not possible to make accurate impact and follow swing. The angle of wrist shouldn't be un-cocked until the end of impact and the left hand should move to the right armpit with a bat. Right hand face the ground and left hand turns upward. It was proved that the player should flex the left knee to support the body, and the heel of left foot should be raised when the player swing.

목차

Abstract
Ⅰ. 서론
Ⅱ. 연구방법
Ⅲ. 결과 및 고찰
Ⅳ. 논의
Ⅴ. 결론
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