| Basing on the theories of physiology, anatomy, psychology and physiology of exercise, sports biochemistry, sports psychology and sports training, using the literature and material, interviewing on athletes and logic analysis for concrete research methods, the thesis has generally and multi-angles analyzed the question on mechanism of dash, and proposed the countermeasures and methods, techniques to the point.Firstly, the thesis analyzes constituent factors influencing performance of dash, that is to say, the thesis analyzes the qualities of system of supplying ATP-CP anaerobic oxidation lactic acid and glycolysis, good strength quality, sport speed quality, endurance quality, flexibility quality, nimble quality and coordination quality. And the function of mechanism of dash manifests it could strengthen the power of muscular contraction, increase the scope of movement and stride length; enhance flexibility of muscle and joints; conserve energy to enhance speed endurance and lengthens work distance; strengthen the rhythm feeling of technical action in order to perfect the technology of dash and enhance stride rate; accelerate the restoration of energy and commodity in body; be beneficial to coordination movement of whole body, accelerate the formation of movement skills and reduce fatigue, and prevent the muscle wound pulled.Secondly, the thesis has dialectically analyzed the inner the connection and relation between ability to relax and skill of relaxation. At the same time, the thesis has expounded the essence of relaxation of dash from angles of physiology, flexibility of nerve system, mechanism of energy supply and psychology. The author proposes that the ratio of muscles to muscles influencing the ability to relax muscles is the important segment of the skill of relaxation of modern dash that its feature is level movement-swing, namely, it is relatively reasonable that the ratio of the muscular strength of back bottom to the muscular strength of front...
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