Three-dimensional Kinematics Analysis of the Technique of "Two Axis-one Bar Parallelism" in Back Layout
Tao He · Journal of Hebei Normal University · 2011
By using the near view,dynamic and stereo photograph method,and for the first time based on new technique standard oftwo axis-one bar parallelism,and by adopting the new moments of cross bar and its indexes,then by using three-dimensionally kinematics parameter,six top Chinese athletes'techniques of cross bar are analyzed.It shows that at the moment of the take-off the angles of athletes'two-shoulder-axis is 73°±3.1° and two-hip-axis is 72°±8.4°.It makes athletes obtain higher flight,and make a chance to parallel two-shoulder-axis and two-hip-axis to the bar.At the stage of crossbar,to fully employ attitudinal reflex of head and limb change,the technique of two axis-one bar parallelism is formed above the bar.Some excellent Chinese athletes can't effectively control and make use of the two-shoulder-axis and two-hip-axis and attitudinal reflex.It makes the right shoulder and the right hip lower than the left,and angles of two-shoulder-axis and two-hip-axis are too big,which influence thetwo axis-one bar parallelism effects and achievements.