The Correlation Of High-level Tennis Player’EMG、muscle Strength And Muscle Fiber Type

Object:The experimental attempt to observe high level tennis player biceps the next segment of fiber type, as well as high level tennis player muscle strength and surface EMG study, suggesting that the relationship between the level of muscle fiber type and athletes. Provide some theoretical basis for tennis training methods and improve athletic performance.Methods:A from Hunan tennis team selected three high-level athletes (training period), subjects age19.72±1.576years old, all male, weighing68.05±4.347kg. Are holding his right hand shot, good health, no bad habits, comprehensive technical standards, outstanding, and no recent injury in athletes. Muscle biopsy needle is removed from the lower segment of the right hand of the biceps muscle, immunoblotting determination of skeletal muscle fiber of MYH Ⅰ of MYH Ⅱ a, of MYH Ⅱ b, the MYH Ⅱ c of protein content. The the corresponding muscle muscle force using surface electromyography the testers and muscle tension tester athletes and surface EMG.Results:(1) every forehand action process cycle, deltoid and biceps first discharge, longer duration. Pectoralis major and triceps discharge late. But throughout the discharge process, deltoids, biceps and pectoralis major volatility forehand action process, the size of the contribution of the force, biceps, deltoid and pectoralis major play a major role and in strength endurance contribution, deltoids, triceps, biceps play a major role, but whether it is the power of the size of the contribution or strength endurance contribution, deltoid and biceps are for athletes most important contribution to the muscle.(2) in the forehand Action process, deltoid first began to discharge, triceps and biceps, last discharge pectoralis major. Muscle EMG activity starting order:the deltoid→the triceps→biceps→pectoralis major.(3) in the forehand Action process, deltoid ending soonest discharge, followed by triceps, pectoralis major final end of the discharge. The end of the sequence of muscle EMG activity: deltoid→triceps→biceps→pectoralis major.(4) forehand action process, the deltoid and triceps discharge time is the longest, followed by the biceps, pectoralis major discharge shortest duration. Muscle EMG activity duration, the length of the order of:deltoid→triceps→biceps→pectoralis major.(5) in the swing process, overall, the integral value of the biceps EMG, followed by triceps and deltoid, pectoralis major minimum. EMG integral values reflect the size of the size of the muscle force activities, seen, exercise in forehand process, biceps maximum force, triceps and deltoid, pectoralis major minimum. This indicates that, in the the forehand process, the biceps from, followed by triceps and deltoid, pectoralis major role played by the smallest.(6) of MYH I of MYH II a, of MYH II b, the MYH II c protein content and EMG integral, MYH II a IEMG is highly negative correlation r=-0.918, statistically significant (p<0.05). MYH II c IEMG highly negative correlation r=-0.902, statistically significant (p<0.05). Conclusions:(1) in the forehand Action process, deltoid first began to discharge, triceps and biceps, last discharge pectoralis major. Muscle EMG activity starting order:the deltoid→the triceps→biceps→pectoralis major. The end of the sequence of muscle EMG activity: deltoid→→triceps, biceps→pectoralis major. Muscle EMG activity duration, the length of the order of:deltoid→triceps→biceps→pectoralis major.(2) The in forehand process, the biceps force, triceps and deltoid, pectoralis major minimum. This indicates that, in the the forehand process, the biceps from, followed by triceps and deltoid, pectoralis major role played by the smallest.(3) In addition to strengthening the biceps and triceps, deltoid, pectoralis major rapid force, reaction force, strength training forehand should strengthen the deltoid, biceps strength endurancetraining.(4) MYH II a, MYH II c and integrated EMG high degree of negative correlation, the MYH II a MYH II c and muscle strength is highly positively correlated, indicating that the biceps fast-twitch muscle fibers play a major role in the forehand.