Comparison of Kinematics and Dynamics on the Standing Long-jump from Different Take-off Angles
Xiong An-zhu · Journal of Tianjin University Science and Technology · 2008
Five PE students were tested of different take-off angle in the standing long-jump by video,Kistler platform and SEMG synchronization.The kinematic and dynamic data was obtained by Simi Motion and Kistler platform software 5.2.The obtaining data was analyzed with the grey theory.The results showed four respects.First,the horizontal speed and the vertical speed decreased by increasing take-off angle.Second,the angle of hip,knee and ankle-bone in the LPA was smaller than in the PA and HPA.So the total angle speed increased by the increasing the moment of inertia.Third,both the driving impulse and the take-off impulse can be used to estimate the effect of take-off.The flight distance increased by decreasing the average force in the phase of driving with increasing muscle shrinking speed and the increasing mechanical efficiency,in addition to increasing the driving impulse.Fourth,the correlation of performance and effect factor was found in the order from highest to lowest as average force in the phase of driving,the time of driving,take-off angle,vertical speed of take-off,vertical impulse in the phase of driving,and horizontal speed of take-off vertical speed.