The Biomechanics Study Of Female's Snatch Technique And Identifying Of The Center Of The Barbell During Weight Lifting

Female weight lifting is a preponderant sport and important olympic sport in China. Snatch is a technique action and it has important effect about the result of the weight lifting. It has an important significance for us to research the weight lifting in keeping ahead the other countries and developing Chinese olympic stratagem. There are two parts in this study. 1. The biomechanics study of female's snatch technique; 2. Identifying the barbell during weight lifting.Testing and analysis. We researched seven China female weight lifting athletes'snatch technique in the game by 3D video. In addition, we still researched seven Shanxi female weight lifting athletes'snatch technique by synchronizing testing of the high speed camera, foot pressure distributing system and wireless EMG system. We analyzed the followed parameters. 1. Kinematics parameters. (1) We researched the curves which knee angle, hip angle, trunk angle and the vertical speed of the barbell changed as the time during the snatch technique. (2) We researched the change of joint angle and the proportion of height and time in different phases. (3) We researched the relation between the athlete and barbell during snatch technique. 2. Dynamic parameters. (1) We researched the curves which athletes'feet force changed as time during snatch technique. (2) We researched the force and pressure distribution of feet and the swaying area of the body in different phase. 3. EMG parameters. We researched the max. of EMG amplitude and the time reaching the max. of EMG amplitude of eight muscles. 4. We synthetically researched the different athletes'parameters of kinematics, dynamic and EMG.The conclusion1. We obtained the integrated kinematics, dynamic and EMG data that can explain China female weight lifting athletes'snatch technique characteristic. We provided some scientific foundations for weight lifting training.2. We discovered the change of the athletes'joint angle and the kinematics parameters of the barbell and the relation between the athlete and barbell during snatch technique by 3D vedio testing.3. We discovered the characteristic of feet pressure distribution, body balance and force change of both feet in different phases by foot pressure distribution testing.4. We discovered the characteristic of muscles effecting and the fire order of the muscles in different phases by EMG testing.5. We roundly discovered the biomechanics characteristic of female weight lifting athletes'snatch technique by synchro testing of the high speed camera system, foot pressure distribution system and wireless EMG system.6. Implement a primitive weight lifting tracking system. This system can track the barbell's motion parameter automatically.