Experimental Study Of Gluteal Muscle Activation Training On Tennis Forehand

Objective:with the promotion of tennis,more and more people love on the sport of tennis.However,the limitation of teaching level reduced the learning effect of the public.With the introduction of different physical training and rehabilitation training methods,gluteal muscle activation is more and more important role.The closed forehand shot as a basic technique of tennis,plays an important role in the process of tennis beginners.In this study,the closed forehand shot as an example,by means of sports biomechanics,explore the influence of gluteal muscle activation exercises on tennis forehand shot in different populations.Expect to provide a theoretical basis for tennis teaching and physical training.Research methods:by using the method of experiment research.Recruited 13 participants who are undergraduates from sport college in Shannxi Normal University.The participants include two groups:trained group and untrained group.Trained group including 7 students who have learned tennis for tow years;untrained group include 6 students never learning tennis sport.Each subjects play three closed forehand shots under different requirements.The subjects conduct the first forehand shot without any intervention.After the first stroke,the subjects prectice gluteal muscle activation exercises,and then immediately the second stroke;after the second stroke,they will rest for 5 minutes and recept passive stretch,and then play the third strokes.Delsys wireless sEMG acquisition system was used to record the muscle activities,two high-speed cameras were used to record kinematic parmeters.The muscles recorded by Delsys includ right soleus muscle,right anterior tibial muscle,right rectus muscle,right gluteus maximus,right adductor longus,right gluteus medius muscle,right biceps,right triceps.After that,we test every muscle's MVC(maximum isometric contract)according to a certain order.While analising the data,the process was divided into two phase:the first phase and the second phase.The first phase starts from ready posture and finish when only the right leg support the body.And the second phase starts from right leg posture to racket touching the ball.EMG indexs include RMS(Root Mean Square),RMS(RMS.of the first phase),RMS2(RMS of the second phase),contribution rate,standardized force.The kinematics indexes include angular kinematics parameters of frontal projection of hip joint and the speed of racket:maximum of hip projection angle,range of hip projection angle,average angular velocity of hip projection angle,peak angular velocity of hip projection angle,racket head average speed,racket head peak speed,racket head speed when touching the ball.About the statistical methods,paired T test was used for comparison between datas of different test times,and independent sample T test was used for comparison between different groups.Research results:1In trained group,RMS1 of gluteus medius afte gluteus muscle activation exercise is significantly lower than that without intervention,RMS1 of gluteus medius after gluteus muscle inhibition exercise is greater than the one after gluteus muscle activation exercise;in untrained goup,RMS2 of gluteus medius afte gluteus muscle activation exercise showed no significant changes compared to RMS2 of gluteus medius afte gluteus muscle inhibition exercise,and RMS2 of gluteus medius afte gluteus muscle inhibition exercise is higher than the one afte gluteus muscle activation exercise.2 There were no significant differences in surface EMG parameters of gluteus maximus under different conditions3In the untrained group,the maximum hip angle of the hip joint was significantly improved after the gluteal muscle inhibition exercise,and there is no significant difference in the movement parameters of the hip joint in the trained group4 There is no significant difference between the racket head speed indexs under different conditionsResearch conclusion:1 Gluteus muscle activation training has a positive effect on the contraction of the gluteus medius in the process of tennis forehand.2Gluteus muscle activation training had no effect on the contraction of the gluteus maximus muscle in the process of forehand.3 Gluteal muscle activation training can increase the abduction of hip joint in tennis forehand stroke.4Gluteus muscle activation training had no effect on the racquet head speed.