Analysis Of Technical Characteristics And Success Of Trial Pole Vault Of Excellent Female Pole-Vaulter Of China

Purpose for Research:In pole vault events,more often,though some athletes often have the strength to cross a certain height,their bodies still touch the horizontal pole.It is because that the spatial position of the center of mass of human body cannot meet the need for crossing the horizontal pole.Lots of researches have previously conducted a lot of researches on the relationship between the kinematic indexes of pole vault and the height of athletes crossing the horizontal pole,as well as the comparison among the technical indexes of different athletes,but the researches in connection with the factors affecting the success or failure of the athletes’ trial pole vault is relatively limited.This study analyzes the technical characteristics,the relationships among the technical indexes and the maximum height of the center of mass of the excellent female pole vault athletes in China,as well as explore the factors influencing the success or failure of the test.Method for Research:This study takes the female pole vault athletes and the technical movements(from the last two steps of run-up to the pole pushing)of the above female pole vault athletes in the finals of the 2019 National Indoor Track and Field Championships(Hangzhou Station)as the research objects,with a total of 34 test pole vaults.This paper uses three-dimensional fixed-point and fixed focus photogrammetry to collect athletes’ competition data,and uses the German SIMI Motion 8.0 motion analysis system to analyze athletes’ technical video.Results of Research:(1)The results show that the speed of the last two steps of run-up of Chinese excellent female pole vault athletes participating in the trial pole vault shows deceleration phenomenon;the overall loss rate of horizontal speed in takeoff speed is16.62 ± 3.51%;the takeoff angle is 19.88 ± 2.33 °;the proportion of bending pole in each technical link shows " takeoff < hang < swing";the increase of vertical speed is0.96 ± 0.33m/s,and the stretching deviation angle is 20.78 ± 13.59 °.(2)The results show that there is a positive linear relationship between the speed of the last two steps of the approach and the maximum height of the center of mass;there is a quadratic function relationships between the speed of the last step of the approach,the horizontal speed of takeoff from the ground,the increase of the vertical speed of takeoff,the angle of the center of mass at the moment of takeoff,the maximum speed during the stretching link,the trunk angle at the moment of starting to push the pole and the maximum height of the center of mass;there is a quadratic function relationships between the maximum speed in the stretching link,the stretching deviation angle and the maximum height;and there is no significant relationships between the maximum height of the center of mass,the vertical speed of takeoff,the loss of horizontal speed of takeoff,the takeoff time,the amount of pole bending and the maximum height of the center of mass.(3)The indexes such as the "takeoff angle of the center of mass at the time of jump from the ground" and "difference between the highest point of mass center and the direction of the horizontal pole X" can be used to judge the whether the pole vault to be successful or not.Conclusion of Research:(1)The results show that the lengths of the last two run-up steps of Chinese excellent female pole vault athletes participating in the trial pole vault are reasonable,but the paces are not maintained;the amounts of the bending pole in takeoff and hanging links of Wu Zuocheng and Yu Xinxin are unreasonable;in the stretching links,Xu Huiqin and Chen Qiaoling can make full use of the elastic potential energy of pole vault,comparing with other athletes.(2)When the stretching speed is above 3.5m/s,the height of the center of mass can be higher;the stretching deviation angle should be controlled at 20 ° so that the rising height in the stretching link should be higher;and the maximum height of the center of mass would be higher when the trunk angle is between 40 ° and 50 ° at the time of starting putter.(3)Based on the data collected at present,through binary logistic regression analysis,the "takeoff angle of the center of mass at the time of takeoff from the ground" and "difference between the highest point of mass center and the direction of the horizontal pole X" can be used to judge the whether the pole vault to be successful or not.And their critical values are respective 19.03 ° and 0.24 m.