A Study On The Correlation Between Ankle Muscle Strength And Kinematic Characteristics Of High School Male Sprinters In Starting Stage

Research objectives:(1)Through the analysis of the technical video of the first three steps of the high school male sprinters,to understand the technical characteristics of the high school male sprinters at the start and to put forward training suggestions.(2)The ankle joint strength of high school sprinters was tested and analyzed to explore the correlation between the strength of the ankle joint and the kinematic characteristics at the starting stage.Research methods:This paper mainly adopts literature data method,observation and measurement method,mathematical statistics method and other research methods.The observation and measurement method is to test the ankle joint isokinetic muscle strength of 8 high school sprinters at different angular speeds,shoot the first three steps before starting and analyze the kinematic parameters of the starting stage with motion analysis software.On the basis of conventional statistical analysis and comparison of data,Pearson correlation analysis is used to explore the relationship between the two.Research results:(1)Under the 60°/s ankle iso-velocity muscle strength test,the peak moment,peak moment weight ratio,total work and average power of most of the 8 high school athletes in plantar flexion and dorsiflexion were greater on the left side than on the right side.In the 180°/s ankle isokinetic strength test,the peak moment,peak moment weight ratio,total work and average power of plantar flexion and dorsiflexion in most people were greater on the right side than on the left side.(2)More than half of the subjects had power imbalance on the left and right sides.(3)All the 8 high school sprinters had the longest time in the air in the first step and the shortest time in the second step.The supporting time shows a decreasing trend.The third step is longest,the first step is second,and the second step is shortest.The ankle support Angle for the first three steps was stabilized at about 92°.The average horizontal speed of the first three steps is about 3.28m/s,3.79m/s,and 4.47m/s,with a significant increase from the second to the third step.(4)The slow strength of the ankle was significantly correlated with the ankle Angle and support time of the three steps before the start,while the fast strength was significantly correlated with the step length,ankle Angle,support time and speed,and had no significant correlation with the air time.Research conclusion:(1)The high school male sprinters’ ankle joint strength is at a high level,and there is some imbalance of the left and right ankle joint strength.The fast power of athletes has not been effectively developed and needs to be improved.(2)High school male sprinters have long air time in the first three steps of the starting stage,long landing buffer time in the supporting stage,and insufficient horizontal propulsion.The stride length is the level of an elite sprinter but the stride rate is too slow to actively step back and the shear speed is slow.The Angle of the ankle joint can meet the need of hard support and maintain stability.(3)According to the results of correlation analysis,the slow speed strength of the ankle joint is highly correlated with the supporting time and the Angle of the ankle joint in the first three steps of running,which is mainly reflected in the landing cushion.The end of the limb,namely the ankle joint,needs to provide strong absolute strength to support and ensure the stability of the torso.Fast strength is highly correlated with ankle Angle,support time,step length,and speed in the first three steps of the run,since rapid centripetal contractions of the ankle muscles are required at the end of the support to push forward.