Coherence Analysis Of EMG And EEG In Walking Cycle Before And After Visual Deprivation

Purpose: Analyze the human lower limb kinematics,muscle mechanics,and the coherence between the central nervous system electroencephalogram(EEG)and peripheral musculoskeletal system electromyogram(EMG)during the walking cycle before and after visual deprivation.In order to explore the difference between peripheral performance before and after visual deprivation and the central nervous system’s ability to control the peripheral musculoskeletal system.Methods: Using Vicon 3D motion capture analysis system,Noraxon wireless surface EMG tester and Brain Products 32-lead EEG tester to simultaneously measure the kinematics,EMG and EEG characteristics of 8 male subjects walking on the treadmill before and after visual deprivation.Using MR3,analyzer and Matlab to analyze and process the collected data,and calculate the coherence of EEG and EMG signals,and using SPSS to perform paired T test on the difference of the data.Results: 1.After visual deprivation,in the non-dominant side,the maximum flexion angle of the hip joint increases(P<0.05),and the range of external rotation of the ankle is significantly decreased(P<0.01).In the dominant side,the maximum dorsiflexion of the ankle is increased(P<0.05),the maximum flexion of the knee increased significantly(P<0.01),and the range of ankle dorsiflexion and knee flexion and abduction was significantly different from that before visual deprivation(P<0.05);2.After visual deprivation,the integrated electromyogram value and root mean square amplitude of the dominant lower limb rectus femoris,lateral femoral,medial femoral,and tibialis anterior was significantly increased(P<0.05);3.After visual deprivation,the EEG signals near the T7 electrode in the left temporal lobe were significantly enhanced,and the EEG signals in the parietal lobe showed spatial changes;4.The coherence between the parietal lobe electrode EEG signals and the EMG signals of lower limb muscles changed from g frequency band before visual deprivation to a and b frequency band after visual deprivation.The coherence between the occipital lobe electrode EEG signals and the EMG signals of the lower extremity muscles changed from being mainly in the g frequency band to being concentrated in the a and b frequency bands.The EEG signals and EMG signals coherence values of anterior temporal lobe decreased significantly after visual deprivation.Conclusion: 1.After visual deprivation,the human body adopts a cautious gait to prevent fall injury,which is mainly manifested by the increase of the height of the lower extremity of the swing phase,the use of the heel to step,and the insufficient extension of the backward pedal.Therefore,it is suggested that patients with visual impairment should actively improve the muscle strength of non-dominant hip joint,dominant knee joint and ankle joint;2.After visual deprivation,the integrated electromyogram and root mean square amplitude increased significantly,and it means muscle work increased,and muscle mobility increased;3.The central temporal lobe region’s ability to control the periphery is weakened,and the control path of parietal and occipital lobes changes from the g frequency band before visual deprivation to the a and b frequency band,And thus provide an important theoretical basis and selection method for the selection of the frequency of electrical stimulation therapy in the treatment of lower limb dysfunction caused by central nervous system disorders by means of brain nerve electrical stimulation.