| The rapid development of the badminton sport and more competition produce more conversion of attack and defense,which requires better sport competence.The backcourt drive is one of the main skill in defense,as it can effectively contain the opponent and change from defensive to offensive position when the other side fails to perform.This study uses the method of literature and expert interview,experimental method and mathematical statistical method.With the help of six infrared high speed camera and one surface electromyography,SEMG,the author collected the characteristics of sports biomechanics of the backcourt drive performed by 12 badminton players from colleges in Gansu Province.Data from body joints and muscles movement were recognized and analyzed with Qualisys and Megawin during this process.During this experience,basic rules and characters of the backcourt drive was understood,structure of the moves made by body joints was explored to undercover the principle of how muscles generate power in this process.A moment of this skill was shown through sports biomechanics microtest to realize the visualization and digitization of the badminton technique and provide a solution for the problem exists in traditional skill teaching and training that the structure of the move is hard to understand so as to further enhance bandminton skills.Conclusions:1.Time: time spending in the preparation stage is the longest;the lower limb pushes against the ground with body twists driving forward shoulder,elbow and wrist.Time spending in racquet leading stage is relatively short with the elbow stretch forward to bring forward the twist and the racquet falls back to ensure that the body is fully prepared.Time spending in swing stage is the shortest with the arm swinging back to hit the ball.Time spending in follow-through stage is relatively short as the arm swinging forward with the last move.2.Upper limb: in the preparation stage,the elbow was driven backward and the body twists clockwise so that the flat consisted by shoulder,elbow and twist are in a high initial position before leading in.In the swing stage the angle of the shoulder,elbow and wrist was extended to provide a longer distance for leading,the speed of wrist while hitting the ball is higher than that of the elbow which is higher that the shoulder.this demonstrates that as the near end stopping to make the far end move faster,the energy transmits from the near end to the far end.3.Torso: Extended body twists ensures better stretch of the belly and chest muscles,more elastic potential energy,higher muscle tension of the body and the upper limb and more angular momentum of the body twist.All joints of the body is motivated in the process of racquet swing for efficient energy transmit.4.Lower limb: Reasonable flexion angel of hip,knee and ankle could extend the initial length of the muscle in the lower limb to give full play to the strength of the low limb pushing against the ground.The angle of the low limb while hitting the ball could ensure the stability and consistency of our body,and the breaking of lower limb could transmit more energy to the upper limb.5.The gravity center of human body: The change of the gravity center of human body mainly comes from the curve of the hip and knee and the low limb pushing against the ground.The gravity center of the body in a lower position for a long time could lead to the tension and fatigue of the leg’s muscle,which could hinder the explosion of the strength.6.Electromyography: Medial tract of deltoid and bicipital muscle of arm are activated to a larger scale to perform drive compared to latissimus dorsi and pectoralis major,which participate less than Trapeziusr and is also lower than Trapezius and deltoid considering the contribution rate. |
