| Before the kick is a kick in Taekwondo competition,will also be used to the technology,is easier to score,before the attack is not easy to be found,small amplitude,fast start-up time,is one of the means of scoring in Taekwondo competition.The athletes must master the essentials before the roundhouse kick in the game,can flexible use in the game,grasp the more favorable opportunity to win the game.Mainly uses the method of remote sensing of EMG,the main force of test group 6 Taekwondo athletes before turning kick technique in various stages of the muscle.According to the measured data,we find out the starting time,ending time,duration and the root mean square amplitude value and the contribution rate of the muscle discharge sequence in each stage.It is more intuitive to see the muscle discharge before yeop jireugi every athlete's,to provide theoretical reference for Taekwondo training before turning kick technique.Through the analysis of the measured data,the following conclusions are drawn:(1)pad step knee stage: from the above data we can see that the first discharge is Chen Jiabao's tibialis anterior muscle 0.001 s,of the gastrocnemius posterior segment 0.001 s.The last discharge is Yang Wencheng's rectus femoris 0.164 s,rectus femoris 0.199 s.From the average value of the figure 3,the standard deviation of the first class athletes of the rectus femoris muscle than two athletes of the early discharge of the rectus.There were some differences in the duration of each muscle.Through the analysis of the root mean square amplitude(RMS)of each muscle activity,the intensity of muscle activity and the level of discharge were weak at this stage.The sequence of muscle discharge is not regular.(2)received bomb hip rotation phase: in this phase is quickly whipped in the shortest time,straight leg as fast as possible,rectus femoris,vastus medialis at this stage is the active muscles,so it first began to discharge,followed by the femoral head two muscle contraction discharge because athletes when the knee joint extended to a certain extent,the muscle will play a stretch,fixed,control effect.Athletes straight leg will stretch straight toes form a rigid body so the back of the gastrocnemius muscle after the beginning of the discharge is also early,when the hip movement will also have a braking point gluteus maximus began to discharge.First class athletes at this stage of the sequence of muscle discharge is relatively reasonable,there is no waste of force,two athletes at this stage of the force of the chaos,poor braking,hit the effect is not good.Two athletes of the end of the muscle discharge is relatively late,indicating that the two athletes of poor braking ability.From the data we obtained with each player technical characteristics and each muscle force time and end time is different,so the duration in the street hip rotation stage length is slightly different.From table 10,we can see that the order of the muscle force of the first class athletes is very regular,so it can be concluded that the main muscle groups of the athletes are the rectus femoris muscle and the posterior part of the gastrocnemius muscle.After the completion of the work of active muscle contraction,muscle contraction of femoral head two athletes in action for braking and energy transfer plays a very important role,the tibialis anterior muscle in this stage is also very important influence on whether the ankle straight,and whether can hit the target but also play an important role in.The discharge of gluteus maximus also affects the braking of hip joint.(3)leg landing reduction stage: from this point of view as a whole,the start time of the 6 athletes is relatively stable.6 athletes at the end of the discharge time is relatively stable,volatility is not large.In addition,the duration of each muscle discharge from the 6 players,each player's muscle duration has a length.From the average root mean square values of some muscles,some of them are weak. |
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