单臂侧手翻投掷手榴弹技术的探讨

AN APPROACH TO THE TECHNTC OF THROWING GRENADE BY TURNING SINGLE ARM CARTWHEEL

投掷手榴弹是国际军事五项比赛项目之一。本文将单臂侧手翻动作与原地投手榴弹技术有机结合起来,提出一种新型的投弹技术——单臂侧手翻投掷手榴弹技术。从生物力学角度对该技术进行分析,其优点主要表现在三个方面:（1）助跑（侧手翻）动作轨迹与最后用力轨迹相吻合,能够将预先获得的助跑速度有效地运用到最后用力动作上去。（2）单臂侧手翻投弹技术有一个更加合理的“超越器械”动作——圆周式运动,进一步给最后用力以加速作用。（3）单臂侧手翻投弹技术在投掷时能获得最大的做功距离,使参与最后用力的肌群得到预先充分拉长,为提高运动成绩打下良好的基础。

Hand grenade throw is one of the five events in the international military games. Combining the movement of turning single arm cartwheel with the original position throw technic,a new technic of throwing grenade by turning single arm cartwheel is put forward in this paper,Using biomechanics to analyze the technic,its advantages are mainly shown in the folliwing; (1)The locus of run-up (cartwheel) is alike to the locus of final exertion,so it could apply the previous run-up velocity to the movement of final exertion effectively. (2) This technic has a more rational ' surmountapparatus'——circular motion ,so it acts on the final exertion and makes a larger acceleration. (3)Thetechnic could get a maximum distance in doing mechanical work. In advance,it makes the muscles which take part in the final exertion get fully pulled,and makes a good basis for raising sports level.