Study On SEMG Characteristics And Mechanism Of Triceps Muscle Tension In Hemiplegic Patients With Stroke

Objective: Surface electromyography(sEMG)was used to investigate the changes of sEMG signal of triceps surae in stroke patients with hemiplegia under different functional states and before and after treatment,in order to analyze the functional rehabilitation characteristics of triceps muscle after stroke from the point of view of electrophysiology.Methods: Forty stroke patients with triceps spasm in the convalescent stage were selected.The same experimental method was used before and after treatment:During passive dorsiflexion distraction of ankle joint,the sEMG signals of internal and external gastrocnemius muscle and soleus muscle in knee extension position and knee flexion position were collected.During five walking cycles,sEMG signals of internal and external gastrocnemius muscle and soleus muscle were also collected.The root mean square amplitude(RMS)of sEMG is analyzed and compared.Results: 1.During passive dorsiflexion distraction of ankle joint : The RMS value of medial and lateral gastrocnemius muscle in knee extension position was significantly higher than that in knee flexion position(P<0.05),but there was no significant difference in soleus muscle.The RMS values of internal and external gastrocnemius muscle and soleus muscle in the affected side were significantly higher than those in the healthy side(P<0.05)in the same position.The RMS value of the medial gastrocnemius muscle of the affected side was the highest in the knee extension position.2.During walking: The RMS value of internal and external gastrocnemius muscle in the affected side was lower than that in the healthy side in the supporting phase(P<0.05),but there was no difference in soleus muscle.The RMS values of internal and external gastrocnemius muscle and soleus muscle in the affected side were lower than those in the healthy side(P<0.05)in the swinging phase.In the supporting phase,the contribution of soleus muscle in the affected si de was higher than that in the healthy side(P<0.05),while that of the lateral gastrocnemius muscle in the affected side was lower than that in the healthy side(P <0.05).3.After treatment,the muscle tension of triceps muscle decreased,and the RMS value of medial and lateral gastrocnemius muscle decreased significantly(P < 0.05),but the RMS value of soleus muscle had no significant change after treatment.Conclusions: The results showed that the increased tension of medial and lateral gastrocnemius muscle is the main factor leading to triceps spasm in hemiplegic patients with stroke.In the process of walking,the soleus muscle of the affected side has a greater contribution,so it is considered that the soleus muscle compensates part of the function of the gastrocnemius muscle and becomes the main active contractile muscle of ankle metatarsal flexion on the affected side.It plays a major role in promoting and stabilizing the walking of hemiplegic patients.The functional characteristics of each muscle group of triceps muscle after stroke were analyzed from the point of view of electrophysiology,which provides a theoretical basis for the rationalization and accurate implementation of spastic foot drop and gait function rehabilitation after stroke.