Comparison Of Activation Degree Of Upper Limb Muscle Group Of Push-up Under Different Stable Conditions

objectives:Comparing the changes and differences of the upper limb muscle integral EMG parameters when performing standard push-up exercises on different stable support surfaces,explore a push-up exercise method that does not increase the exercise effect by increasing the external load of the skeletal muscle system.Enriching the selection of push-up exercises,improving the effect of push-up training,and providing theoretical basis for sports rehabilitation training and training equipment research and development.Methods:recruit a sports college graduate 20（men）,using the Desktop Noraxon company DTS16 channel methods of electric system to collect the participants in the stable bearing surface,single is not unstable support surface bearing surface,double instability standard push-ups movements,deltoid toe,deltoid muscle bundles,triceps,biceps,pectoralis major,multi-channel semg The MR3 software supporting the surface EMG acquisition system was used to export the original data,and the IEMG of each muscle was calculated and processed by the Matlab R2018B software,and the 2S（push-up descending-ascending stage）integral EMG value was captured.The integral EMG value of each muscle at the maximum isometric contraction（MVC）was tested,and the standardized EMG value of each muscle was obtained(IEMG%_MVC).Finally,SPSS24.0 was used to analyze the differences between standardized integrated myoelectric values(IEMG%_MVC)of the subjects when performing standard push-ups on different stable support surfaces.Results:During the descent stage of push-up:（1）There was no obvious difference in IEMG%_MVC of anterior deltoid muscle bundle between different stable support surfaces（P>0.05）.（2）There was no obvious difference in IEMG%_MVC value between the middle band of deltoid muscle at different stable support surfaces（P>0.05）.（3）The difference of IEMG%_MVC of triceps brachii in different stable support surfaces was obvious difference（P<0.05）.The difference between the stable supported surface and the single unstable surface without obvious difference（P>0.5）.The solid support surface compared with the double unstable sustain was more difference（P<0.05）.There was no obvious difference between the single unstable support surface and the double unstable surface（P>0.05）.（4）The difference of IEMG%_MVC of pectoralis major in different stable support planes was not obvious difference,（P>0.05）.（5）The difference of IEMG%_MVCof biceps brachii in different stable support surfaces was obvious difference（P<0.05）.The difference between the stable supported surface and the single unstable surface was obvious difference（P<0.05）.The difference between the stable support surface and the double unstable support surface was more difference（P<0.05）.The single unstable support surface compared with the double unstable support surface without obvious difference（P>0.05）.The ascending stage of push-up:（1）The IEMG%_MVC values of the anterior bundle of deltoid muscle on different stable support planes were obvious difference（P<0.05）.The difference between the stable supported surface and the single unstable surface was obvious difference（P<0.05）.The difference between the stable support surface and the double unstable surface was obvious difference（P<0.01）.The difference between single unstable support base double compared with unstable base was obvious difference（P<0.01）.（2）In IEMG%_MVC value between the middle band of deltoid muscle at different stable support surfaces without obvious difference（P>0.05）.（3）The difference between IEMG%_MVC values of triceps brachii on different stable support surfaces was obvious difference,（P<0.05）.The difference between the stable supported surface and the single unstable surface was obvious difference（P<0.01）.The difference between the stable support surface and the double unstable surface was obvious difference（P<0.01）.The difference between single unstable support surface and double unstable surface was obvious difference（P<0.01）.（4）The difference of IEMG%_MVC of pectoralis major on different stable support planes was obvious difference（P<0.05）.stable base and the single unstable surface was without obvious difference（P>0.05）.The stable support surface and the double unstable surface was obvious difference（P<0.01）.The single unstable support surface compared with double unstable surface was obvious difference（P<0.05）.（5）The difference of IEMG%_MVC of biceps brachii in different stable support surfaces was obvious difference（P<0.05）.The stable supported base compared with the single unstable surface without obvious difference（P>0.05）.The difference between the stable support surface and the double unstable surface was obvious difference（P<0.01）.There was no obvious difference between the single unstable support surface and the double unstable surface（P>0.05）.Conclusion:Standard push-ups on double unstable support surfaces can better activate upper limb muscles than single unstable support surfaces.The practice of unstable push-ups using Bosu hemispheres can be used in the training of upper limb muscle groups;When performing standard push-ups,upper limb muscle activation is affected when lower limb support is unstable;Muscles do not necessarily show greater activation due to unstable conditions or increased levels of instability during push-ups.It depends on the load being placed on the muscles and the type of movement being performed.