Kinematics Analysis Of Throwing Techniques Of Elite Female Hammer Throwers In China

Wang Jun,Zhang Wenxiu,an excellent female hammer thrower,was selected as the research object.Use two JVC GC-PX10 AC high-speed camera,Wang Zheng and Zhang Wenxiu in the game when the hammer throwing technology action to shoot,of which No.1 machine is located in the throwing circle is behind the rear 5 meters,No.2 machine in the throwing circle right rear 5 meters,The machine height of about 1.2 meters,shooting frequency of 50 frames / sec,the camera's main optical axis angle of about 90.Shooting from the pre-release to the full technical action.The use of Beijing Senmiao Xin developed the company's high-titanium 3D Signal TEC V3.2HDC analysis system to analyze the video recording,analysis by step-by-step analysis,get threw the technical action of the relevant kinematic parameters,and then these kinematic parameters To analyze.The main results are as follows:(1)The athlete's use in the pre-swing stage is longer than that of the Cuchenkova,which will cause the hatching of the hammer to be too slow,which in turn leads to the task of accelerating the hammer in the pre-pendulum stage To the next stage to complete,thus increasing the pressure of the rotation phase.(B)in the rotation of the first lap,the second lap right foot to the moment,Wang Zheng and Zhang Wenxiu shoulder and hip angle are greater than 300,indicating that the trunk is better to reverse,is conducive to the right foot ahead of the double support and extended double support Time;however,as the number of revolutions increases,the shoulder hip angle gradually decreases at the moment of the third and fourth laps.So that the right foot too late to the ground,increased support for the time alone,is not conducive to the acceleration of the hammer.It has been found that the reason for the smaller hip hip angle in the latter two may be that when the hammer speed reaches a certain level,the athlete must rely on the trunk to keep the body balance to reduce the speed at the expense of maintaining the body's dynamics balance(3)There is no obvious gap between the height of the athletes in China and Kuchenkova,but there is a gap between the Chinese athletes and the world's elite athletes,Kuchenkova,in terms of the speed of hammer throws and the angle of shot.Resulting in Chinese athletes hammer performance as an important reason for foreign athletes.Therefore,I hope that our athletes in the hammer throwing a complete technical action,pay more attention to the final stage of the hammer throw speed.Through the analysis of the important kinematic parameters of the excellent female hammer throwers Wang Zheng and Zhang Wen xiu,the kinematiccharacteristics of the technique of throwing the horns are obtained,which is of great practical significance to improve the technical level of the horns of Wang Zheng and Zhang Wen xiu.Enriched the theory of throwing hammer action technology.