GROUND REACTION FORCE OF THE SNATCH MOTION AND KINESIOLOGY ANALYSIS BY PHOTOGRAPH

Abstract

INTRODUCTION AND METHODS As to the snatch motion in weight lifting, the structural mechanism and quality of motion is better understood by camera analysis and force analysis through the use of a pressure plate. The pressure plate allows one to make more generalizations to the structural mechanism and quality of motion as technological theory is introduced. RESULTS AND CONCLUSIONS Some conclusions of this research are: 1) Motion of bar, coxa and articulation knee, are similar to one another in S-forms but in stand-up process all the weights of three informants show a tendency to drop behind. 2) In the L snatch motion, the weight is pulled up to about 67% of his height. 3) Right after lock out in the snatch motion, the velocity of each articulation is maximum. Especially that of shoulder articulation is maximum, 3.4 rnlsec and the acceleration of 17.89 m/sec2. The order of the velocity of each articulation is as following: coxa> elbow>knee> ankle. 4) In the snatch motion, the maximum vertical of ground reaction force appeared at the end of lock out motion. That of Kang was about 2.8 times (194.2 Kg) as heavy as his weight while that of Lee was about 3.2 times (193.4 Kg), and that of Park about 2.5 times.