마루운동 손짚고 앞돌아 몸펴 앞공중 1회 비틀기동작의 운동학적 분석

Abstract

The purposes of this study were to analyze event and phase of handspring salto forward stretched with turn to investigate the difference of kinematical variables between two groups as movements skillfullness. All subjects were divided into 3 national gymnasts (skilled group) and 3 college gymnasts (less skilled group) .For this purpose, during each trial 4 high-speed video camera were used to measure movements by Kwon 3D program applied for calculation of 3-D coordinate and body joint central point. The conclusions of this study were as follows. The forward twist salto performance was increased when duration time of the air was long during the salto forward stretched that duration time of handspring is short, the pressure at takeoff is high, the footstep is large, and hands are supporting on the ground quickly. In terms of CMP, the performance was better when the displacement from right to left was small, the displacement from the anterior to posterior was large and the displacement from superior to inferior was high gravity; Velocity of CMP, right and left velocity of body gravity was kept balance both left and right in the velocity repeatedly for skill group, while there was unbalance because of increasing the left velocity for less skilled group as it was going to the latter part. Both skilled and less skilled group in the velocity of CMP was moved from slow at the point of starting movement to quick at the performing skill. And anterior and posterior velocity of the body gravity for skilled group was decreased rapidly to keep the balance when they were lading on the floor. Right/Left and Anterior/posterior takeoff velocity for skilled group were lower than those for less-skilled group, while Superior and Inferior rising velocity was very high during forward twist salto. And also it helped to extend stay and hight in the air of duration time. In terms of body joint angle, the footstep was large when knee joint of the left was flexed, the movement for taking lift have the pressure of takeoff increase with the lower limbs flexed backwards. The powerful movement in the elbow joint made the lower limbs rotate, in which contributed to the body upward. During the twist movement, the angle of right elbow joint was a little stretched and the angle of left elbow joint was a little flexed. The shoulder joint in the right and was positioned to closely trunk and the shoulder joint in the left was a little upright.