Kinematics Research On The Lower Limb Movements Of Chinese And Foreign Male Long Jump Athletes In The Takeoff Stage

This paper takes the lower limb movements of the Chinese and foreign men's long jumpers as the research object,and takes the top eight men's long jumpers in the 2018 World Diamond League Shanghai Station as the research sample.The two high-speed portable high-speed motion recording system was used to capture the player's game technology.The star-high peptide three-dimensional motion analysis system was used to analyze the game image,and the three-dimensional kinematic parameters and indicators of the sample were obtained.The research methods in this paper are literature data method,film shooting method,moving image analysis method,mathematical statistics method and comparative analysis method.On the basis of the basic situation,the kinematic parameters of the take-off stage and the correlation between the kinematic parameters and the scores of the starting stage,the top eight men's long jumpers in the 2018 World Athletics Diamond League will analyze the Chinese and foreign elite athletes.In comparison with the advantages and disadvantages of lower limb movement techniques in the take-off stage of elite athletes in China,we find reasonable and unreasonable techniques for the take-off stage of Chinese elite athletes,and strive to find ways to improve the take-off technique of Chinese long-distance athletes in the study and solve the teaching of take-off techniques.And the breakthrough of training problems,and explore the internal relationship and rules of various technical parameters and sports performance during the jump,to provide better technical direction for the Chinese men's long jump,better improve the sports performance of long jump athletes,and extend the life of sports.Research indicates:(1)The height of Chinese and foreign excellent male athletes is close to the ideal value.The domestic athletes are lighter in weight and lower in muscles.The absolute strength of domestic athletes is lower than that of foreign athletes.The age of domestic athletes participating in competitions and achieving personal best scores are less than Foreign athletes have shown that domestic athletes have great sports potential,and they also show that domestic athletes have fewer sports years.(2)The take-off time of Chinese and foreign excellent male long-distance athletes is similar,and there is a significant difference in the index of extension.The index of domestic athletes is smaller than that of foreign athletes.The buffer time of domestic athletes is longer,and the conversion and extension time of foreign athletes is longer.It is unreasonable to allocate the jumping time of domestic athletes.(3)There are significant differences between the Chinese and foreign athletes in the ground angle and the squatting angle.The domestic athletes have smaller ground anglesand squat angles,and the fan angle is too large,which leads to inconsistent take-off action and prolonged take-off time,which is not conducive to maintaining horizontal speed and improving.Vertical velocity;there is a significant difference in the joint angle of the jumping leg in each phase of the take-off phase.The small change of the joint angle of the domestic athletes shows a better ability to maintain the speed.The moment of the joint angle from the ground is small,the extension is not sufficient,and the take-off range It is too small;there is a significant difference between the angular velocity of the swinging leg and the angle between the two legs in the take-off phase.The performance is that the swinging legs of the domestic athletes are not coordinated enough with the jumping legs to limit the athletes' sports performance.(4)There is a very significant difference between the Chinese and foreign excellent male athletes in erecting the vertical speed and the rising angle.The domestic athletes have a vertical speed and a small angle.The utilization rate of the athletes is very low.(5)The athlete's angle of the ground,the joint angle of the lower limbs,the horizontal speed of the rise,the vertical speed and the angle of the rise are highly positively correlated with the results of the competition;the take-off time is highly negatively correlated with the sports performance.