A Study On The Plantar Pressure Of Tennis Player S Forehand Hitting Topspin Ball

The German company will produce through the use of Pedar-X pressure insoles,sports college in guangzhou with secondary and above level tennis players of the open and closed type forehand topspin forehand plantar pressure,and foot plantar pressure impulse and foot contact area,a foot trajectory and plantar pressure center support period of each index were analyzed,and the sole is divided into four areas: T1-T5(phalanges),M1-M5(metatarsal),MF(arch)and HF(heel)were used to analyze the plantar pressure of tennis players’ open and closed forehand topspin balls in the moving state.The following results were obtained:(1)Pressure peak: The peak pressure of T1-T5(phalanges),M1-M5(metatarsal),HF(arch)and HF(heel)were 325.13?50.87 k Pa,429.07?102.31 k Pa,254.95?40.31 k Pa,386.85?60.65 k Pa,respectively,when tennis players hit topspin in an open mode.The peak pressure of T1-T5(phalanges),M1-M5(603.11?143.28 k Pa),MF(arch)and HF heel when tennis players hit topspin in the closed type are 381.32?56.35 k Pa,279.52?46.81 k Pa and 477.59?72.43 k Pa.The pressure of the phalanges,metatarsal,arch and heel of the open topspin ball of tennis players is all less than that of the closed topspin ball,and there are significant differences between the open topspin ball and the closed topspin ball at the heel and metatarsal.(2)Contact area: the contact area of T1-T5(phalanges),M1-M5(metatarsal),MF(arch)and HF(heel)in tennis players’ open forehand topspin is 30.35?3.71,55.27?6.83,46.83?6.74 and 40.31?2.13 respectively.The contact area of T1-T5(phalangeal bone),M1-M5(metatarsal bone),MF(arch)and HF(heel)is28.06?2.45,57.88?5.49,48.16?5.28 and 41.59?1.93,respectively,when a tennis player is hitting topspin in the closed type.The contact area of each area on the sole of the forehand except the phalanges is smaller than the contact area of the other areas on the forehand topspin.(3)Plantar impulse: the peak value of the impulse of T1-T5(phalanges),M1-M5(metatarsal),MF(arch)and HF(heel)is 636.44?453.46,397.75?211.29,222.51?201.34,and 237.4?1193.13 when the forehand is open and hitting the top-spin ball.The peak impulse of T1-T5(phalanges)and M1-M5(metatarsal)is(709.72?502.25)and(354.35?304.59),the peak impulse of MF(foot arch)was223.23?184.27,and the peak impulse of HF(heel)was 293.59?242.16.Open hit a topspin forehand plantar metatarsal area of pulse peak is greater than the closed hit topspin forehand metatarsal impulse peak,other plantar area are less than the pulse peak plantar peak impulse closing hit topspin forehand,and open hit topspin forehand in phalanges of pulse peak and the closed hit topspin forehand phalanges of pulse peak has significant difference.(4)The change rule of pressure center trajectory curve: tennis players’ open forehand and closed topspin show a smooth line segment.Based on the above research results,the following conclusions can be drawn:(1)according to the comparative analysis of the plantar peak pressure/pressure in open forehand topspin when peak plantar pressure/pressure regions are less than forehand plantar peak pressure/pressure closed type,according to the force is mutual,the greater the pressure peak plantar area ground of body force,the greater the driving arm swing speed,thereby increasing velocity,so in certain conditions with the same force to hit a topspin forehand,the closed stance will hit topspin speed is greater than the open stance hits the ball.(2)according to the comparative analysis of the plantar peak impulse whether open forehand shot hit topspin forehand topspin or closed type foot impulse peak from large to small is phalanges,metatarsus,arch and heel,impulse is the reaction between the description of objects in the accumulation of time,so whether open hit topspin or the closed hit topspin(right column)as a foot first half area after use frequency is higher than a foot and a half area,use frequency is higher,the more prone to injury,pay attention to the plantar foot especially first half area of protection and muscle exercise.(3)according to the laws of the plantar pressure center trajectory curve data analysis shows that the at HFetes whether open forehand shot hit topspin forehand topspin or closed type,struck topspin focus more steady,hit topspin points more accurate,the better the balance ability of the body,the smoother the plantar pressure center trajectory curve,and hit a topspin stance has nothing to do.