The Kinematics Of Chinese Excellent Women's Hammer Throw Athletes Zhang Wenxiu Spinning Technology Research

Designated that in2011the nation long throws the public competition,female hammer throw champion winner Zhang Wenxiu for object of study. Throughto Zhang Wenxiu’s revolving technology, carries on longitudinal and the horizontalanalysis, to raises our country hammer technical level the enhancement to have thevital significance. Uses2JVC9800high-speed cameras carries on the image by50/sspeed synchronization photographies and the3-DSignalTec video recording analysissystem the analysis. To the time characteristic, the single both feet support time andthe ratio, the hammer speed change and the acceleration are away from, the leadangle, the shoulder hip angle, the hip full angle, the torso inclination angle, the hipangle, the knee angle, the malleolus angle analysis. Main result demonstration:(一)Zhang Wenxiu is not positive in the warm-up swing stage acceleration, causes torevolve the first, second velocity of whirl difference to be big, The third, fourth timelapse-rate has not promoted, to cause its revolving rhythm not to be obvious, thevelocity of whirl slightly has the declining trend, oneself to the hammer control inthe drop, has achieved the physical ability limit. Although the rotational time has thereduction, compares the overseas good player to use is long, list, the both feetsupport time ratio is smaller than1, list, both feet support’s time distributionunreasonable（.二）Hammer speed and acceleration distance: Longitudinal comparison, ZhangWenxiu in hammer’s velocity increasing improvement, reduction of small single support phasehammer speed loss. Horizontal comparison, Zhang Wenxiu in the double support phase on thehammer speed capability is superior to the library working section wa; Single-support phase,Zhang Wenxiu hammer’s velocity loss is bigger, cause double support phase to obtain a larger hammer’s velocity, in the single support phase lost, so that the rotation of the hammer’s velocityfluctuation is bigger still, not conducive to the smooth transition of single, double support. In thedouble support phase hammer acceleration distance (azimuth) of less than fifty percent per ring,is the result not to be ideal factor.(三) In whirling action angle change: Longitudinalcomparison, Zhang Wenxiu in the rotation process, beyond the angle, shoulder angle, hip angleof the foot have been increased, the acceleration of the fast rotating and hammer, torsional trunk,lower extremities to reverse the ability to accelerate the pelvis. With the increase in the numberof rotations, joint angle, trunk angle, respectively, to reduce and increase the phenomenon,which affects the hammer speed and rotation radius decreases. Zhang Wenxiu in t8moment, thedifference has three links around the hip, knee, ankle angle decreases, to provide the conditionsfor the convergence of rotation and the final stage of the final force; Point of view of the left sideof the body is less than the world ’s top athletes, Zhang Wenxiu in the rotation process, thebody’s center of gravity low, which is conducive to better control the rotation of the hammer.The angle difference between the left and right side, so the body left angle increases, the bodyis easy to lose balance, resulting in the decline of hammer speed.Zhang wenxiu the hammer throw rotation of the vertical and horizontal analysis of the kinematiccharacteristics of the hammer throw, and practical significance to improve the technical level ofZhang Wenxiu hammer throwing the hammer action of the theory.