Kinematics Analysis Of Zhang Jun Throw The Shot Put Technique

Purpose: By analyzing the video of Asian record holder ZhangJun’s technology of rotary shot put, revealing the kinematic laws of its technology. Atthe same time, this article has also selected Jia Peng’s Back Gliding Shot technology toanalysis.Analyzing the strengths and weaknesses of the two technologies,to make thekinematic reference for Zhang Jun’s personal action’s improvement, and also provide atheoretical basis for science teaching and training of China’s Shot put.Method: using3-D signal TEC V1.0C star high titanium sports biomechanicsvideo analysis software system to make three-dimensional analysis of the video takenat the March of2011Chengdu National indoor track and field Championships shot putcompetition to get the kinematic parameters.Results: In order to better refine the study of the kinematic parameters, twodifferent technical phase and phasing has been departed, rotary shot putting techniqueand Back Gliding Shot Put technology were divided into five phases andfour stages.By analysis of the two athletes’ video of the Chengdu National IndoorChampionships shot put, data processing and comparative analysis of work.Drawn therotary shotput and the Backward Slide Shot Put technology kinematic characteristicsand laws.Conclusion:(1) Zhang Jun technical features in the pre-swing acceleration stage:T1, shoulder and hip axis angle, angle of the left hip, right hip angle, the angle of theleft knee, right knee angle of44.2°,136.0°,125.0°,131.2°,134.3°; the focus speedof0.49m/s at T1, T2,1.20m/s.Shot speed of0.53m/s at T1, T2,2.44m/s.Leftshoulder speed of0.74m/s at T1, T2,2.74m/s.In Oscillating acceleration phase, rotating the left shoulder faster than the speed ofthe left shoulder back sliding technology.(2) in the rotating stage ZHANG Jun technical features: the focus speed onT2-1.20m/s, T3,2.28m/s.Shot speed of2.44m/s at T2, T3,4.33m/s.Rotating stagewith0.42s, accounting for28.38%of the entire action.Rotating stage (sliding phase), the center of gravity of rotary speed and shot speedgreater than the back center of gravity of the sliding technology, speed shotspeed.Backward Slide Shot Put there is a significant pause in the sliding phase, the rateof decline of the center of gravity and shot put, rotary technology is more "smooth", in the center of gravity and shot speed.Rotary action of the right leg, swing draw the arcof action is a "compensation movement to achieve body balance.(3) in the buffer stage ZHANG Jun technical features: the focus speed in T32.28m/s and T4is2.48m/s.Shot speed of4.33m/s at T3and T4is4.15m/s.Bufferstage with0.20s, accounting for13.51%of the whole with.T4in the shoulder and hipaxis angle of104.90°In the buffer stage, the focus speed of the rotary technology of increase than theback sliding the center of gravity speed increase is large.Rotating the left foot toalways shoulder to hip axis angle angle greater than22.7°Back Gliding technology,rotary technology Back Gliding technology beyond the equipment and better action.(4) ZHANG Jun technical features in the final stage of exerting strength: thespeed of the center of gravity2.48m/s T4and T5is2.72m/s.Shot speeds T4is4.15m/s T5,12.59m/s.T5left support foot knee angle of171.8°, T5Right Heel kick theknee angle is162.3°.T5dual support feet a distance of0.67m, accounting for shot ahigh level of33.67%.Shoulder axis angular velocity673°/s.T5shot speed, angle,height of12.98m/s,38.20°,1.99m.Hand displacement, time, average speed,1.22m,0.22s,5.54m/s, T4to T5.In the final stages of force, Zhang completed in the final hard stage shot averagespeed is greater than Jia Peng, Zhang Jun’s last shot to shot speed shot speed greaterthan Jia Peng.