Study On Analysis And Evaluation Of Crawling Movement Function Based On Surface EMG

Crawling is a systemic alternating movement of limbs,playing an important role in the development of infants.Carrying out research on crawling movement and exploring the neural control mechanism of crawling can help clinical diagnosis and rehabilitation of patients with neuromuscular system diseases.At present,there are few studies on crawling,and most of them are kinematic analysis based on scales,video,acceleration and etc.And there is a lack of research on the angle of neuromuscular control.At the same time,most of the crawling-related research is aimed at single limbs or unilateral limbs,and there is a lack of systemic deep-level motion control mechanism research.In view of the shortage of existing research,this paper firstly carried out research on the characteristics of crawling motor neuromuscular control in 16 healthy adults(HA).Further,taking 8 children with cerebral palsy(CP)as the research object,the feasibility of evaluating crawling motor dysfunction in CP children from the perspective of neuromuscular control was explored.First,in order to realize the analysis of the neuromuscular control characteristics of crawling movement,a set of crawling movement data collection scheme based on pressure sensors and surface electromyography(sEMG)electrodes is proposed.From each side of the limb,15 muscles(8 muscles in the upper limbs and 7 muscles in the lower limbs)that are most relevant to crawling movement were selected as the target muscles.The sEMG signals of 30 muscles and pressure signals on the left and right hands were collected simultaneously for crawling movement analysis.Secondly,taking the ipsilateral and contralateral hand-knee crawling as the research object,the characteristics analysis of crawling motor nerve control in healthy adults was carried out based on the three analysis methods of muscle co-activation,muscle synergy and spinal cord mapping.From the perspective of muscle co-activation,the co-activation of 6 groups of antagonistic muscle pairs and 2 groups of non-antagonistic muscle pairs was analyzed.It was found that crawling speed had little effect on the co-activation coefficient between muscle pairs.And the co-activation coefficients of the same antagonist muscle pairs on both sides of the limbs showed good symmetry.For the two different crawling modes,there are significant differences in the co-activation coefficients of the two muscle pairs:extensor carpus radialis and sartorius,extensor carpus radialis and semitendinosus.From the perspective of muscle synergy,it was found that four groups of muscle synergy corresponding to the typical crawling stage can be extracted from the crawling movements of all subjects.The analysis of cycle repeatability,symmetry,similarity between groups,and similarity between patterns of muscle synergy shows that crawling is a movement in which the upper limbs dominate.The main difference between the two crawling patterns is the swing sequence of lower limbs.From the perspective of spinal cord mapping,it can reflect the activation of motor neurons in the cervical and lumbosacral segments of the left and right sides of limbs.And the main activation time distribution of the spinal lumbosacral motor neurons can reflect the coordination pattern between limbs to a certain extent.Finally,crawling movement analysis was carried out on CP children,and the feasibility of evaluating motor dysfunction of CP children from the perspective of neuromuscular control was explored.Specifically,the use of muscle co-activation analysis can assess the difference in the degree of motor dysfunction of the left and right limbs of patients.Muscle synergy analysis can be applied to assess abnormal muscle activation patterns in CP children.Using spinal cord mapping analysis,the coordination pattern between limbs can be evaluated at the level of spinal nerve activation.