| Javelin throwing motion is a difficult type of project speed and strength, especially in the final stages of exertion, it is the strength of the core base to speed the process, the core of its technology in action is to maximize the coordination role of the body part shot speed pursuit. Both start-up and development of Javelin late1970s appeared on a number of outstanding athletes, such as Shen Maomao, Xu Demei, Ha Xiaoyan, etc. Javelin stage in the development of China’s slow start phase, especially in men’s javelin, breaking80meters to become a major difficulties currently facing. In this paper, our excellent Male Yan Zekun, Hu Hailong study. The use of German production company SIMI SIMI motion7.0three-dimensional high-speed motion video analysis system (including shooting frequency of100frames/sec three cameras and12calibration points of the three-dimensional movement of the frame) on the two athletes carried out five different time periods (2011.09,2012.03,2012.06,2012.09,2013.04) sentinel site shooting and image analysis, the single best single period of data selected two guns, a total of20guns (10guns each) data as the study sample. Use of literature, expert interviews, high-speed cameras, image analysis method, mathematical statistics, theoretical analysis and other research methods, the final stage of the two players forced the country to track individualized diagnosis and kinetic analysis, the athletes technical parameters of individual correlation, and correlation independent variable horizontal and vertical comparative analysis, as coaches athletes in developing individualized training program to reform training methods, content and improve the scientific level of providing specific quantitative indicators, so that athletes throwing technique has been further developed and improved.Through analysis of the results the following conclusions:(1) On the right lower extremity landing buffer stage:Yan Zekun into force when the lower limb stage, force posture to maintain good; But buffering time is too long, right hip rate of decline is too big. Hu Hailong buffer time is short, can quickly turn lower limb force process; However, when transferred to the stage of lower extremity force difficult to maintain a stable force posture.(2) To the right lower extremity force phases:Yan Zekun force total time is short, the lower limbs move quickly, quickly whipped into the upper course of action; knee angle is well controlled; lower limb muscle strength and power is good; But the timing is not kicking forwards force reasonable, right hip active force premature to form a " kicking turn sync", resulting in the loss of momentum. Hu Hailong’s force when the total length, timing and the right hip peak acceleration force has been formed on the action stereotypes; hip muscle strength, but poor, right hip active force too late to form a" secondary hair between the lower limb and hip power", right hip acceleration is small, the total time force is too long, and less leg muscle strength and explosiveness; knee angle control is unstable, affecting acting distance.(3) Throwing arm momentum transfer stages:Yan Ze-kun upper limb muscle strength and explosiveness better; But technically javelin initiative to accelerate the wrist did not play a braking effect, making the wrist loss of momentum, acceleration javelin small; in the wrist initiative to accelerate the elbow poor flexibility, initial elbow angle is too small, the right elbow angle change too much, resulting in acceleration distance is too small, the impact of wrist speed; shoulder flexibility poor throwing arm pulling angle is too small, the impact of right elbow the acceleration distance; accelerate technology in the right shoulder chest and abdominal muscle strength and power is not enough, leading to an acceleration right shoulder instability. Hu Hailong full bow angle, shoulder hip axis angle, throwing arm and elbow angle pulling angle are relatively stable stage of development effort to maintain good body posture; But in the javelin initiative to accelerate technology wrist did not play a braking effect, making wrist momentum loss, javelin small acceleration; poor upper limb muscle strength and explosive power, acceleration effects of the right elbow.(4) Javelin shot phases:Yan Zekun shot low height, shot angle is too small, the yaw angle is too large; Hu Hailong shot angle is small, the attitude angle is too large to small angle of attack, yaw angle is too large, the data changes the trend is the lack of stability.For the conclusion,the following recommendations for Yan Zekun:(1) Strengthen the special technical training, including training in situ spears, spears half run-up exercises, the whole approach spears practice.(2) Be right hip cushioning technology targeted training, flexibility training, including the legs, throwing further coordination training, reducing the height of the cross-step training vacated.(3) Lower extremity kicking hip twisting force with force synergy of technical training, can make use of equipment (rubber band, elastic band, etc.) to lock or suppress the right hip, right hip to avoid premature force, establish a reasonable the pedal power forwards opportunity.(4) Strengthen the wrist muscle strength and power training, technical action by the full-speed whipping action on the upper wrist braking action to do targeted training.(5) To strengthen the shoulder flexibility training, avoid whipping arm action in the "off elbow action", increasing the throwing arm pulling angle, acting to increase the distance.(6) To strengthen the elbow flexibility training, whipping arm action to avoid premature elbow action, increasing the angle of the right elbow, acting to increase the distance.(7) To strengthen the chest, abdominal muscle strength and power training, especially for the pectoralis major and external oblique training.(8) To raise the height of the shot to reduce the yaw angle increases shot stability.The following recommendations for Hu Hailong:(1) A high degree of correlation between the various stages of technology for targeted training, fighting to break the original motion technology to create a more optimal technique stereotypes.(2) Strengthen the tibialis anterior muscle and femoral muscle strength training, improving Throwing Techniques to reduce the height of the cross-step vacated.(3) Lower extremity kicking hip twisting force with force synergy technical training to strengthen the hip muscle strength training.(4) Strength training to strengthen the leg muscles, especially the quadriceps explosive training in order to increase the kicking part of the hip joint force acceleration, reducing the overall time-consuming force that quickly passed up the momentum lower limbs.(5) The right knee kicking skills training, training equipment by isokinetic force training athletes the best angle and force the opportunity to establish technical stereotypes.(6) To strengthen the wrist muscle strength and power training, technical action by the full-speed whipping action on the upper wrist braking action to do targeted training.(7) By strengthening the chest, abdomen and shoulder muscle strength and power training, make up due to the damage caused by the right elbow elbow strength lacking.(8) Lower attitude angle and yaw angle, the longitudinal axis of the force to improve the effect of throwing the javelin. |
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