A Study On The Function Of The Swinging In Long Jump Among China's Top Male Play

Takeoff is the most important technique among the others, set the body's speed and direction at the lifting moment and proceeds to determine the distance of the long jump. Therefore, the technique of takeoff has always been the study focus. Takeoff is completed within 0.1 second or so, and what is the relation between extension-thrust skill and swinging skill? How is swinging completed? Most coaches have realized the function of swinging, but they cannot understand deeply the mechanism of affection that swinging has to the whole takeoff. Even though coaches often remind jumpers to swing quickly and actively when they take off. Yet they have different ideas about this swinging and proceeding related to our arrangement of teaching focus and teaching order. As a result, this different understanding will affect teaching, training and performance.By way of relevant analyses of the factors the performance and skill of long jumping and analyses of data from video record of excellent athlete in our country, this paper studies the relating between the role and method of swinging and other relevant causes, provides references for further training andteaching.The swinging movement in long jump mainly includes swinging of leg, the stretching of hip at swinging leg's side, the swing of arms etc. Swinging leg play a most important role. According to this study, swinging speed of swinging leg at the moment of planting on the board will decrease the angle between two thighs, and that decreasing places the body gravity at a higher position when planting on the board, all of these make a good preparation for cushion phase. In the cushion phase, I chose the maximum swinging speed of swinging leg, for this can reflect whether the swinging leg make a active swing in the cushion phase. The study shows that it has a significances relevance to the finial lifting speed. Furthermore, the study finds that in the cushion phase the loss of horizontal speed has little relevance to the maximum angle of knee in cushion. The paper choose stopping accelerations of swinging leg in the takeoff phase, to analyze the affection between this acceleration and the beginning speed of lift, the increased height of body gravity, the high extension and stamping at the board.Because of the special structure of hip point, the hip can make 3-axis movement around supporting leg. There two hipjoints connected pelvis, the movement of one hip will definitely affects the way and direction of the other hip's moving, this paper related the movement of hip in swinging leg's side to that of takeoff leg's side, try to study the mechanism and affecting of this movement (in swinging leg's side)to the angle of planting on the board, to the angle between thighs at the moment of taking off, to extensive degree of takeoff leg, to the hip angle of takeoff leg's side.The purpose of swing of arms and legs is nearly the same, but comparatively speaking the affection of arms, to the height of body gravity and to the strength of takeoff, is small because of its small mass. This paper studies the different using of arms swinging between excellent athletic and what is written on the textbook, compares the advantage and disadvantage of the two kinds of arm swinging, explains different swinging used by athletic levels.