ON THE ORDER; TIME PROCEDURE AND TIME DIFFERENCE OF MUSCLE'S STRENGTH WHEN DOING SWING PARTS AFTER HANGING ON FLYING RINGS

Abstract

INTRODUCTION -How is the magnification of the lower back muscles exerting force during back and whip swing from hanging position in ringn How is the effect of these muscles on the movement? The study about the problems has not been found op to now in home and abroad. In this study, we selected five typical movements of back and whip swing in rings and revealed the four muscles acting mainly on the back and whip swing in rings METHODOLOGY • Five male gymnasts were selected as subjects in this study, three among them were selected from Shanxi Gymnastic team, other two from China National Gymnastic Team The High-speed Camers (Model LSS-16A, soeed.1 00 frames persecond), pulling-force sensor (Modef:HYL-I) and remoto EMG meter (ModeIMulli-Telemeler 551, (Japan made) were simultaneously operated by means of Synchronous Signal Generalor. EMG signal from four muscle groups was directly sent into microcomputer (APPLE 11) to proc ess, and signals of EMG and pulling-force sensor were also recorded by, Multi Telemeter, the dale of camera was processed by Film Analyzer (Model: NAC MOVIAS 100). RESULTS AND DISCUSSION -Copating the first peak with the second peak of pulling-force curve, the value of first peak was smaller. This reason was caused by the dropping shoulders. There for the more complex the great the muscles exerting force (pulling force) acting on the rings, because the magnifition of support force acting on the rings depended mainly upon the extent of muscle contraction. Front the point of view of the lime course of the muscle contraction, the maximal value or mean voltage in ENG always occurred in the course from the moment of the hip extending 10 exerting force was the largest in this course. The occurrence of the first pead indecated the end of the dropping shoulders and the start of whip swing Therefore during this course, athlete should voluntarily extend his hip joint.