Kinematics Of Some Chinese Elite Women Javelin Throwers Technology

Javelin throw is a periodic motion to a periodic motion of the mixedsystem. In teaching, training and research will be full of javelin throw technology isdivided into holding gun, gun running, the last, buffering and javelin flight five parts.And gun in the five part when run-up and the last is the most important, because early inthe javelin throw about30%came from the run-up speed,30%came from the last.Every athlete in the sports practice has its unique technical style, and with the project ofexcellent athletes in addition to the respective technical style, between their technicalfeatures but also has high degree of consistency. So for elite athletes of technology,especially the key technology is analyzed, to help athletes achieve optimal combinationof the technological variables are very significant and necessary. Based on2012national long throw open three players before the game (lv, Du Xiao wei later, changspring breeze) as the research object (including lv, Du Xiao wei later Olympic mark, Aprosperous spring breeze B standard), by the method of3d camera resolution, the threeathletes throwing steps and final force of kinematics analysis, to obtain their throwingsteps and final force of kinematics parameters, summarize their technical characteristics,and their associated kinematic parameters and kinematic parameters of other excellentathletes at home and abroad comparative analysis, to explore their throwing technologysuperiority and the insufficiency, provides the kinematic quantitative indicators forcoaches, athletes, training, to help athletes achieve optimal combination of thetechnological variables.Through to our country in2012the national long throw open three players beforethe game of throwing and carries on the kinematics of the comparative analysis betweenthem on the last step, the results show that:(1) three athletes throwing steps of the steplength, step, step frequency is not completely accords with the general law of excellentjavelin athletes throwing step, the gun too short when the step length, step by step, thepace too fast;(2) in the process of the throwing steps, three athletes throwing arm,shoulder, elbow too loose; Step (3) throwing phase of lu to ride the trunk inclinationAngle variation law in line with the world elite athletes, and Du Xiao wei andprosperous spring due to the deliberate pursuit of transcendence instrument movement,throwing step after step2trunk drastically, resulting in a decline in run-up speed toofast;(4) in the process of throwing steps, three athletes body center of gravity changedoesn’t completely conform to the characteristics of "low, flat, fast";(5) they, before andafter the lv will loss to maximum speed, height is too high, the body center of gravity toleap a Du Xiao wei and prosperous spring wind speed loss is small, the body center ofgravity leaps height more gentle;(6) the last process, three players did not make full use of the torso at the beginning of "whipping" to improve the javelin to speed;(7) from themoment they right foot steps to throw the fourth moment, your left foot strikes theground three athletes body center of gravity horizontal speed loss rate less than theaverage of other excellent athletes in our country, and from moment to javelin tomoment your left foot strikes the ground, three athletes speed utilization ratio is greaterthan the average of other excellent athletes in our country;(8) the working process ofthe last leg, three players stretching technology in China is better than other excellentathletes; But before have not form a double support, has the right upper, with early;After the formation of double support joints on the right side of the power sequence iscorrect, in line with the "whipping" principle;(9) on the left side of the lowerextremities braking, stretching in technology than the world outstanding athletes, in thelast process, left shoulder, left elbow has positive braking;(10) javelin to moment, makemoves faster than the mean of other excellent athletes in our country, but the mean slowthe world’s elite athletes, out on the high side, Angle and attitude Angle is larger, theinitial attack Angle and the world elite athletes.