Analysis Of Sport Biomechanics Of Stepping Forward At Right Forecourt Of College Badminton Majors

According to the different approach distance of step forward back and forth in right forecourt when playing badminton,this assay made a sport biomechanics analysis about the right forecourt step forward carried out by16 college students who major in badminton in place when at right forecourt,mid court and back court.Accordingly we made an index quantification and comparative analysis about the step forward at right forecourt exercised in three different ways,finding the similarities and differences between schoolboys and schoolgirls which will provide a scientific reference for teaching and training in the coming days.Meanwhile we derived the experimental data about the lower limbs joints of students major in badminton during the return process after stepping forward at right forecourt and had a further understanding about the force characteristics of the lower limbs when they stepping forward at right forecourt.And thus,put forward relative suggestions on step forward at front court and return with a rapid speed as well as offered useful references to prevent sports injuries occurs in playing badminton.With the help of Vicon motion capture system,ergograph,and myoelectricity,we made a comparison of the exchanges of cuts between college schoolboys and schoolgirls when they stepping forward at right forecourt after lengthen the approach distance(forecourt,mid court,and back court)and drew conclusions as follows:(1)Although students major in badminton reduced their time on stepping forward,the buffer time increased hence has little influence on return time and total time.As for students major in badminton,girls' movement speed is slower than boys,having a rather long concentric and eccentric coupling time during the buffer period.So the total time they consumed is longer than boys.(2)During the buffer and return period,with the increase of distance,the athletes' force on axes Fz and Fy will increase accordingly.Particularly,thereis a rather large change on axis Fz compared with that on axis Fy.According to the ergograph,forces on the three axes of girls major in badminton are all smaller than boys.Girls major in badminton have relative weak lower limb strength,thus in terms of force in thrust phase there is a gap between boys and girls.(3)The change of distance between forth and back will enlarge the variation of the angle of hip joint,knee joint and ankle joint.Besides it will exert the greatest impact on buffer time: the angle of hip joint,knee joint and ankle joint will reduce,and during this period,the reduction scope of boys major in badminton is larger than girls major in badminton which impedes the backward process of the center of gravity,thereby affecting the return-speed.However,boys major in badminton have a much better tiptoe outward swaying than girls which will accelerate the return speed and protect their ankle joints from sports injury.(4)When playing badminton at forecourt,mid court,and back court the biggest buffer angle of knee joints of both schoolboys and schoolgirls who major in badminton are all smaller than 130 degree for this would guard their joints against sports injury.(5)At different stages of stepping forward,the sequence of muscle's myoelectricity of all students major in badminton is: tibialis anterior muscle of left leg,biceps femoris muscle of left leg,biceps femoris muscle of right leg,tibialis anterior muscle of right leg,rectus femoris muscles of left leg,gastrocnemius of right leg,gastrocnemius of left leg,and rectus femoris muscles of right leg.And the sequence of muscle's myoelectricity during return process is: gastrocnemius of right leg,rectus femoris muscle of right leg,gastrocnemius of left leg,biceps femoris muscle of left leg,tibialis anterior muscle of right leg,tibialis anterior muscle of left leg,biceps femoris muscle of right leg,and rectus femoris muscles of left leg.(6)There is a similarity between schoolboys and schoolgirls who major in badminton when they playing badminton at forecourt,mid court,and back court.But,the integral value of myoelectricity of schoolboys major inbadminton is higher than that of schoolgirls major in badminton,and that of back court is heigher than mid court and forecourt.Nevertheless,in general,the integral value of myoelectricity of muscles reflects a relative stable regular pattern.