Three Dimensions Kinematics Analysis On Liu Hai-long's Side-spring-kick Skill

With the coming to the world sport arena, science is becoming more more importnt in the study on free fighting. However, the traditional training theory obstracts the progress of wushu in some way. As one of the most impornt leg moving methods in morden free fighting skills, it has the characteristic of "whip" . Because of it' s high-speed and great-force, side-spring-kick is attached more importance in modern free fighting game. In serious of tourments, side-spring-kick has showed great power. With the improvement of free fighting copetitive level, is becoming the most imporant score measure. Therefore, it has actuality signifiance to study the kinematics rule of side-spring-kick skill.Though document method, on-the-spot shooting method, film analysis method, data-statistics and consulting with experts, this articl tries to analuse the whole process of Liu Hai-long' s hitting sandbag with the left high side-spring-kick manage to obtain a series of data and parameters related to physical kinematics. At the same time, this article makes an overall and sustematic qualitative and quantative analysis to the obtained data and parameters. From the perspectives of each segments locus features and speed feathures and theangle variation characteristics, hence getting the basic kinematic characteristics of Liu Hai-long' s left side-spring-kick movement, seen from his shoulders and hipbone' s movement locus and their angle curve, the left .shoulder' s movement locus turns out to reciprocate; inthe process of pre-waving , the sportsman' s waist and stomach are fastened while in the ending period of thigh foruard-waving, his waist and stamach are fastened in the opposite direction, so it is shown that the left kicking leg movement really involves the big segment棗trunk in order to produce a larger anglar momentum; seen from the locus characrteristics and speed characteristics, of the left hipbone, the left knee, the left tiptoe, the movement chain in the leg moves from the big segment to the small segment; the speed characteristics side kicking leg shows that at each segment, the speed of the movement, at the moment of hit ing sandbag, the greatest speed doesn' t lie in the the left tiptoe, but on the Y axis, thefolding----unfolding process of the sportsman' s legstregthens the whip effect .The research is intended to reveal the kicking movement' s real movement reguler pattern and chacteristics, enrich and deepen the theoretical system and research methods on free fighting sports, provide reliable standards and parameters for its education and training and also promote the systemlization and scientification of its thoretical research.