The Dimension Kinematie Research On Body Center Of Gravity Motion Of Men’s20km Race Walking Athletes At The12^th National Games

In many track and field events, race walking which has a unique technical struct ure. It is a typical cyclical racing project. It requires athletes to have strong technique and stamina combined athletic ability. Referees award a technical foul weight movem ent as secondary basis. The weight movements changes directly affecting the race walki ng techniques unusually. The research sample of this article is the athletes in May2013,12th Chinese National Games man’s20km race walking. The object of this article is the body weight dimensions on the eight athletes. Signal TEC Video three-dimensional motion system is used for analyzing the images of samples, giving accurate kinematic indicators and parameters. This study provides a theoretical basis for the Chinese me n walking race athletes scientific training and technical guidance.Main method of this thesis are:literature, three-dimensional video measurements, expert interviews, logical analysis, and mathematical statistics.Research result shows that:1. The vertical displacement of the body weight in a single step of our national men walking race athletes is within the world average level. The flight time is within the "fuzzy flight time". Athletes’head position change a little. The offsets of body weig ht average changes little, almost in a straight line. This is comply with the laws of p hysics and basically in balance.2. Chinese male athletes’arm swing of elbow joint angle slightly is greater than reas onable technical requirements in the swinging techniques of upper and lower limbs. Becaus e the left and right elbow angles differ little, their left and right arm swinging is relativel y balanced, keeping the stability of body weight movements. And leg swing technical requi rements are in accordance with technical rules, only individual athletes have left and right leg differences, affecting the body’s balance.3. Most of the athletes’pelvis twist down of the Chinese male athletes is not enoug h in back stage, which causing the vertical speed is quite big when pelvis swinging for ward and causing the distance of the ups and downs of the center weight is large.4. Chinese man walking race athletes’landing angle of two feet higher than the world level athletes, stomp angle is slightly less than the world level athletes. Bian Tongda’s left and right stomp angles have big difference, which affect the range of m ovement for his body weight and the stability of the structure.5. Chinese man walking race athletes’elevation and inclination angle of the trunk is slightly greater than the foreign athletes, which are causing body weight lag and a flecting the forward movement. Their torso’s left and right angle are in the normal ra nge. The torso angle of Bian Tongda, Pei Lianyou and Wei Xubao is relatively large, and their body swaying is quite obvious.