The Kinematic Analysis On Characteristic About Throwing Technique Of Domestic Female Elite Hammer Thrower

Analysis and Diagnosis of Elite Female Hammer Throwers technical action to improve our women's hammer throw sports athletic performance is significant. Therefore, this paper before the 2014 National Track and Field Championships Women's Hammer Throw Grand Prix Finals cum project eight players for the study,using two CASIO FH25 camera to set the shooting frequency is 120 Hz, the shooting distance of 10 meters, high 1.2 m, the shutter speed is 1/2000 seconds to shoot three-dimensional imaging, for hammer throw technique time parameters kinematics analysis; speed parameter analysis; locus parameter analysis;angle shot parametric analysis and parametric analysis reveals Elite Female hammer Thrower Skill the relevant kinematic characteristics. Based on the kinematic parameters analysis concluded that:(1) From the time parameter point of view: the longer the pre-swing, my eight athletes Oscillating time when used; the rotating stage, and Jenny Zhang Wenxiu took less reached the world Elite level athletes, but the time lapse rate was significantly lower than the library Cen Bokova time lapse rate, and the rotation frequency instability; 8players, athletes foot support 5 times higher than the total time total support feet, bis support of lack of time, d / s ratio is low; the last time in the force ratio of the total time is also much lower than the share of outstanding foreign players, in general, China's athletes in the last exertion fully accelerated short duration of action.(2) From the Speed parameter point of view: our players for Oscillating utilization rate in general, compared with the world's top athletes are still some gaps(53%); the rotating stage, the majority of players in double support phase velocity hammer increase in single support phase decreased speed per lap minimum and maximum values are on the rise, but the total loss of high speed hammer,our athletes and world famous sportsmen compared to the speed of rotation in the secondround and third round obtained by almost the same amount, but in the first lap and the speed difference between the larger increment fourth lap; our ability to athletes in the last exertion sustained acceleration is relatively weak, the initial velocity of the shot of the minimum contribution rate, and ahead of the end of the last exertion action is not conducive to improving the initial velocity of the shot.(3) From the trajectory parameters, the hammer in the double support phase and finally forcibly phase of the total length of the running track,to better reflect the beginning of Players technology rationality and hammer shot speed; the highest point of the best players of each lap run partial Hammer low, lowest high point,resulting in a higher center of gravity of the body,indicating that the lack of Chinese athletes in the rotating motion technology exists; most of our athletes support dual stage hammer acceleration distance is less than the single support phase, causing his right foot from the ground instantly hammer azimuth bias Great, right foot forward late, it failed to effectively use the hammer to run down the process of superimposing benefit from the strength of gravity and the body highest point; our hammer thrower in the body of rotation right foot off the ground and landing opportunity following action technological phenomenon : the first is represented by Ms Liu and Zhang Wenxiu "late fall early lift" action technology; second is Wang Zheng, Lorna and Jenny as representative of the "early morning lift off" action technology; the third is Wang Lu as the representative of "late Night lift off" action technology; and the fourth is Wang Yingying Li Yumao represented "late fall early lift" action technology.(4) From the angle parameters, the analytical data of Elite Athletes shoulder hip twist angle can be found, they are also stranded in a conventional amplitude, slow-paced traditional technology; Tingting and Zhang Wenxiu of only two athletes in each when the right foot off the ground ring shoulder chain angle minimum value, other athletes at every lap right foot off the ground chain shoulder angle substantially higher than 90; data from the athletes foot landing double support beginning chain shoulder angle is concerned, Zhang Wenxiu,Wang Zheng and Lorna data relatively more reasonable,hammer throw at each lap right foot landing when passing in front of the torso, in the best radius of rotation, but the other athletes,especially Liu Tingting,Wang Lu,Wang Yingying and Li Yumao first lap,Jenny Li Yumao second ring and the third ring on the right foot landing instant chain shoulder angle is greater than 100; the entire rotation, only an athlete Liu Tingting attention to the forward movement of the torso, while the other players in the rotation movement of the trunk and with the hammer movement is not coordinated; our only athlete Wang Zheng,Wang Lu and Lorna three players during the rotation of each ring right foot from the ground instantly right hip angle is gradually increasing,accelerating the rhythm is good,and Zhang Wenxiu, Yan Ni, Wang Yingying and Li Yumao which four athletes decreased to some extent, restricted the rapid and excessive forward center of gravity to accelerate the rhythm of the poor; the right foot off the ground when the hammer and shot, the overall Chinese Elite hammer Thrower left ankle angle with the case of increasing the number of rotations gradually decreased,the increase in the hammer throw shot Shiyou,indicating his right foot from the ground instantly ankle kicking more and more inadequate, compared to Wang Yingying in this regard than other athletes do good point, right foot landing in an instant,my Elite hammer Thrower left ankle angle almost no lift too high.(5) shot from the parameter point of view,the angle of Hammer Thrower shot an average of 35.30,Zhang Wenxiu is the largest 38.14 and the smallest is Wang Yingying to 32.45, there is a certain gap with the world's top players, which shows that our hammer thrower in hand when the "back" of the existence of certain deficiencies; hammer shot height or have a certain effect on the competition results, our elite athletes done in this area is not very satisfactory.