Tennis Racket Balance Coefficient And The Effect Of Baseline Drives And Relationship-handed Arm Shock Loads

Mass distribution is an important parameter tennis racket, swing weight and the force has a close relationship with the racket, it changes the performance of the racket will change, thus affecting the effect of hitting the ball when the arm and the impact load.In this paper, Trigno wireless EMG acquisition system, YSV dynamic acceleration signal acquisition system, YSV dynamic strain gauge and a portable radar speed gun on the Beijing University of Physical Education of the Tennis 15 two male athletes head heavy, head light balance and three quality distribution kinematics racket when carried out forehand, dynamics and forearm surface EMG data collection, and in accordance with the method of ITN international tennis grade test batting depth and accuracy were evaluated to study the mass distribution of the forehand racket ball effect and forearm suffered shocks loads, participants can provide a theoretical basis tennis ball afraid of choice, at the same time will provide data to support the development of the racket.The collected data analysis, the following findings and conclusions:1 in the dynamic conditions of holding the racket, racket balance changes had no significant effect on the size of racket ball speed, balanced racket for placement has good control, but ball control is lower than the other two categories racket. Head light racket in the stability ball better than head heavy and balanced racket. So the athletes according to their own situation to adjust the balance of the racket in order to achieve the most reasonable batting effects.2 the lighter the racket head, pre-activated forearm muscles sooner, the lower the overall level of muscle discharge amount. But they are not hitting the ball less than the weight of the racket head racket to hit the ball out. Description racket head light racket ball better on the active force. Players according to their size and strength characteristics, reasonable adjustments racket balance.3 head heavy racquet when hitting the racket itself suffered minimal impact, vibration force generated by the smallest racket, forearm muscles by the impact is minimal. Racket head light racket ball racket itself when subjected to the biggest impact, racquet vibration generated maximum force, but the forearm muscles are smaller than the impact of the use of forearm muscles balanced racket hitting force.4 the use of balanced racket, racket impact of changes in discharge levels forearm that changes the size of the force and forearm muscles with minimal impact. Slightly inferior to the use of balanced racket head heavy racquet when using the maximum head light racket.5 when the muscles of the tennis ball and rackets discharge peak time stress peak time are basically the same and slightly earlier than the racket force peak time.