A Comparative Study On The Surface Electromyographic Characteristics Of The Core Muscles Under Two Core Force Movement Modes

Research purpose:By studying the EMG characteristics of the muscles in the core area under the stable and unstable conditions of flexion and extension and flat type movements,this paper explores the stimulation degree and total stimulation value of each movement to the muscles in the core area,so as to provide scientific theoretical guidance for the strength training in the core area.Research methods:Through the methods of literature,observation,expert interview and experiment,the changes of muscle electromyography in the core area under the condition of stable and unstable flexion and extension and plate movement were studied.By recruiting 30 students majoring in physical education of physical education,the test movement was divided into flexion and extension and plate movement.The right rectus abdominis(RRA),external oblique abdominis(REO),erector lumbar spine(rles)and gluteus maximus(RGM)were tested.Results:(1)Under stable condition,the stimulation intensity of flexion and extension on rectus abdominis is about 7%-55%,that of external oblique abdominis is about 33%-48%,that of erector spine is about 29%-52%,and that of gluteus maximus is about 15%-47%.The stimulation intensity of flexion and extension on rectus abdominis is about 6%-53%,external oblique abdominis about 28%-43%,spine erector about 29%-49%,gluteus maximus about 16%-37%.(2)Under the stable condition,the stimulation intensity of the plate movement to the rectus abdominis is about 3%-43%,the external oblique abdominis about 8%-41%,the erector spine about 5%-45%,and the gluteus maximus about 8%-44%.Under the unstable condition,the stimulation intensity of the plate movement to the rectus abdominis is about 5%-38%,the external oblique abdominis about 8%-42%,the erector spinalis about 8%-44%,and the gluteus maximus about 13%-47%.(3)Through K-mean clustering analysis,the flexion and extension type and the plate type are divided into four sub categories.The first sub type of flexion and extension movement is dominated by rectus abdominis and obliquus abdominis.The second kind of action is the action of the main force of the erector spine muscle.The third kind of action is the action of vertical spinal muscle and external oblique muscle.The fourth kind of movement is dominated by rectus abdominis and erector spinalis.The first sub class of the plate movement is dominated by the abdomino lateral oblique and gluteus maximus.The second subcategory is the action dominated by erector spinalis and gluteus maximus.The third kind of action is the action that the external oblique muscle and the vertical spinal muscle lead to force.The fourth kind of action is dominated by the external oblique muscle.Conclusion:(1)By using the area calculation method of coordinate graph,we can calculate the total stimulating degree of the movements of flexion and extension and flat plate to the muscle groups in the core area,which can accurately and intuitively show the stimulating degree of various movements to each muscle group.(2)Through K-mean clustering analysis,the movement patterns of flexion and extension and flat plate are divided into four sub categories,each sub category represents the movement exercises dominated by different muscle groups.(3)The maximum stimulation degree of the muscle group in the stable condition is higher than that in the unstable condition.(4)The maximum stimulation degree of flat type movement to rectus abdominis and erector spinalis is slightly higher than that of unstable condition,and that of external oblique abdominis and gluteus maximus is slightly higher than that of stable condition.(5)The maximal stimulation of flexion and extension to rectus abdominis,obliquus abdominis,erector spinalis and gluteus maximus was higher than that of flat type.