Research On The Characteristics Of Shoulder And Hip Movement During The Throwing Of Chinese Elite Female Shot Putters

Through the research on the characteristics of shoulder and hip movement during the throwing process of elite female shot putters in China,we find out the internal factors that restrict the improvement of women's shots in China,and clarify the key issues that women's shots should solve in future training.Women's shot putters prepare for the targeted training in the 2020 Tokyo Olympics.This study uses the literature data method,test method(mainly high-speed camera method,three-dimensional kinematics analysis method),mathematical statistics method,the best video of the active female shot putters in China,using the high-speed camera for three-dimensional fixed-focus shooting,The 3D frame is photographed;then the "APAS" motion analysis system is used to first calibrate the captured 3D frame,and then the game video is synchronized,intercepted,and analyzed,and finally the acquired raw data is statistically analyzed.Through the research,the following results were obtained:(1)The difference between the body center of gravity and the hip joint speed of the three athletes in the sliding stage,Leica,Guo Tianyu and Gaoyang,the three athletes have poor control of the hip joint;Gong Lijun “People— The hips have a good effect and have strong control over the hip joints.(2)During the transitional period,the three athletes,Leica,Guo Tianyu and Gaoyang,have left foot on the ground and the left shoulder opens too early,which reduces the body's tightness.Degree,and the acceleration time of the right hip is only accelerated after the left foot touches the ground for 0.25 s.If the pause time is too long,the speed after the end of the slide will be reduced,which will adversely affect the final shot speed.Gong Lijun's left foot touches the ground instantly.The timing of hip acceleration is early,the speed of lower limbs is faster than that of upper limbs,and the posture of the instrument is better.(3)In the final stage of exertion,the speed of the right shoulder of Gaoyang and Leica is small and there is a downward trend,while the speed of right shoulder of Gong Lijun continues to rise,reflecting Gong Lijun's sustained acceleration ability is good,and the body acceleration force of the shot put is over.At this time,the left hip speed of Gaoyang is still rising,and the order of acceleration is not Management.According to the results,the following conclusions can be drawn:(1)In the sliding stage,the female shot putters in China generally have the phenomenon of large stretch and body center of gravity;Gong Lijun maintains the horizontal speed of the body center of gravity in the sliding stage,and the whole sliding stage moves.Smooth,accelerating rhythm,and strong ability to coordinate hip joints.(2)In the transitional stage,the shoulder-hip torsion angle of the female shot putters in China is generally small,and the degree of tightening of the trunk muscles of the body is poor.When the left foot touches the ground,the right hip accelerates at a later time;the back tilt angle of the trunk is too large,and the effect of the transcending device is not ideal.The transition time between Chinese women's shot putters and the world's top athletes is significantly different,affecting the rhythm of the transitional stage;Gong Lijun's left foot is on the ground and the right hip accelerates at an early time,the body is tight,and the effect of transcending the instrument is better.(3)In the final stage of exertion,there is a general lack of left hip extension in our players.The left shoulder is opened earlier,the upper body is not actively moved forward,and the right hip and right shoulder are poor in front.The shot is shot in an instant,Leica and Guo Tianyu.The three athletes of Gaoyang have poor ability to accelerate the shot.Gong Lijun's left hip in the final exertion stage is fully extended,the right leg has a good stretching effect,and the chest arm has a good frontal ability,which is conducive to improving the shot height of the shot.