Research On The Biomechanical Character Of The Back-style High Jump Swinging Leg During Support And Swing Stage

The take-off is critical to obtain the vertical velocity for back-style high jump and core link for back-style high jump technique.From action structure analysis, take-off movement generally includes body swinging (place leg, swinging arm) and take-off leg buffer and pedal stretch. The timing speaking from action, swinging leg before take-off leg landing in swinging, has begun to gawk at take-off leg out from the ground, ending with the swinging leg swinging through out, that is to say, the swinging of swinging leg existed the whole take-off process,and play an important role. Therefore, the swinging leg as the breakthrough point for this study, using three-dimensional force measurement machine synchronous high-speed camera in our special six athlete high-jump swinging leg support and swing phase biomechanical characteristics were measured observation, which aimed at further reveal swinging leg from touch down supporting to finish the biomechanical characteristics take-off stage, revealing take-off process with swing, buffer and buffer stretch, pedal stretch and gawk related indexes swinging the deep relationship, and analyze the take-off of energy transformation process, velocity transformation mechanism, further deepen the understanding of the laws of high jump, reveal the deep connotation of high-jump cucve, so as to provide reference technical teaching and training.This paper used the literature material law, expert interview,3d high-speed camera method, video analytic method and mathematical statistics, and the six test object of swinging leg support and swinging phases biomechanics analysis.Conclusion of the study:1. There is a largely horizontal speed value between the test object run-up final step and the final two step, but a little horizontal speed value with the final step approach, and with the world's horizontal speed smaller excellent athletes significant difference, this is mainly due to test object speed, special ability lacking of insufficient reserves, swinging leg support technology and strength of order and so on.2.Throughing the 3d swinging leg support force measurement, we can found that stage count down step for deceleration obvious test object function in the horizontal force value obviously less than deceleration smaller test object. The reason of that is take-off sequence is unreasonable, so that forcibly swinging leg knee pedal stretched into a small scale.3.The world excellent athletes and test object end with gravity run-up and corresponding high ratio of height run-up pour step, the changing of countdown step in velocity value significantly very related to the final stage, and a higher level of body gravity is hlepful keeping the run-up speed.4.From the participating swinging leg swinging angular stage during take-off and the kinematics parameters related correlation analysis, we found that the swinging leg swinging angular velocity, take-off time and ankle pedal stretch speed related highly significant; The swinging leg swinging angular velocity and buffer period, the knee's pedal stretch angular velocity have not obviously related.5. According to the take-off buffer structure analysis, this paper puts forward the two parts process involves "buffer speed buffer" and "swinging buffer". "Speed buffer" always throughouts the buffer; And "Swing buffer" begins in the acceleration of swinging leg placed stage.