手榴彈散兵群目標投擲與基本投擲之運動學比較分析

本研究主要目的在於分析手榴彈投擲項目中，散兵群目標投擲的肢段動作，研究擷取手榴彈瞬間初速度，以及腕關節、肘關節、肩關節之角度與速度等，以期建立散兵群目標投擲的運動學參數。研究以對手榴彈投擲之教練具有豐富經歷的陸軍少校體育官為受試對象，並以Kwon3D動作分析軟體計算與擷取各項運動學參數，得到以下結論：（一）散兵群目標投擲的肘關節角度較基本投擲時之角度小，局關節角度則無差異。（二）肘關節速度較基本投擲時之速度小，肩關節速度則無差異。（三）實施散兵群目標投擲時，應改變肘關節的角度與速度，來降低左右水平的位移，增加投擲的準確度。

關鍵字

手榴彈投擲；散兵群目標投擲；運動學

並列摘要

This research is an analysis of body motions of skirmishers' target-throwing in hand grenade throwing. We get the instantaneous initial velocity, and the angles and speed of wrist joint, elbow joint, and shoulder joint at the throwing moment in order to establish kinematics parameters of skirmishers' target-throwing. The objects are the army Major athletic directors who have rich experiences in acting as the hand grenade throwing instructors. We use Kwon3D motion analysis system to calculate and get every kinematics parameters which we draw conclusions from. Firstly, when the angles of elbow joints of the target-throwing skirmishers' are smaller than the basic throwing angles, their shoulder angles have no difference. Secondly, whlie the speed of elbow joints of these throwers are slower than the basic throwing speed, their shoulder speed has no discrepancy. Thirdly, when carrying out the skirmishers' target-throwing, the throwers should change their angles and speed of the elbow joints in order to lower the horizontal displacements and increase the throwing accuracy.