Biomechanical Analysis Of Female Pole Vault In China

Objective:Chinese elite female pole vault athletes were taken in this article as the research objects. Some key techniques of kinematics were analyzed on the basis of sports biomechanics principles and pole-vault technical requirements. Characteristics of techniques of chinese elite female pole vaulters were revealed and the technical factors that affected performance were also discussed. References of chinese female pole vault teaching, training and research were provided to improve the qualities of techniques.Methods:Two-dimensional and three-dimensional analysis methods were used to acquire chinese female pole vault athletes technical parameters. After that, related softwares were applied to analyze the kinematics and energy indexes. Pearson correlation coefficient was used to analyze relevances between the key indexes that affected performance.Results:Run-up phase:penultimate last stride speed of the COG tended to decrease or be the same trend. Stride length showed a trend of decrease. Take-off stage:take-off time negatively correlated with the maximum height of COG; distance between top hand and left toe at takeoff and horizontal speed of COG loss were positively correlated; the take-off angle of the COG was positively correlated with the increase of vertical velocity and vertical velocity increase rate; the resultant speed of COG and maximum height of COG were positively correlated; COG horizontal velocity when taking off and maximum height of COG were positively correlated.Pole support phase:the kinetic energy decreased after takeingoff, and reached the lowest when most pole bending moment. Total energy decreased along with kinetic energy, reached minimum when most pole bending moment then increased with potential energy. Rotational energy quantity is small, only1.03%of the total energy at most. The greater the degree pole bended, the greater the energy increased. Maximum height of COG is positively correlated with the mechanical energy when reaching maximum height of the center of gravity. The trunk started to cycle when pole bending initiated, the active push-pull action of the left upper limb and right elbow positive pulling to pole were the key to swivel. The thighs began buckling before the pole releasing finished, this would decrease the moment of inertia of the body so that speeded up the body to bar. Pole releasing had no help upgrading the effect of gravity center.Conclusions:1. The run-up speed was the key factors that affected performance. The last two run-up stride wasn’t key factor that affected performance.2. Taking-off point should be adjusted to reducing the loss of horizontal velocity and vertical velocity increases, thus reducing the angle of take-off.3. Vaulters were able to input muscle work during the take-off and pole support phase.4. Vaulters’trunks began to swivel from the most pole bending moment, reached maximum speed when pole straightened. Left upper limb active push-pull action and right elbow positive pulling to pole were the key to swivel.5. Vaulters’pushing pole has no effect on lifting the body because hip flexion was so early that made the body began to fell.