The features of surface electromyography of knee joint control ability disorders in spastic hemiplegia patients

Objective To analyze the features of surface electromyography(sEMG) signal of the thigh muscle in convalescent stroke patients during knee voluntary extension and flexion. Methods Thirty-five stroke patients with who suffers spastic hemiplegia in Taizhou Hospital of Zhejiang Province from July,2013 to December,2014 and age-and sex-matched normal controls were involved in this study.The signals of sEMG of root mean square value(RMS) and co-contraction ratio(CR) from the patients and controls were compared. Results The knee extension in patients with bilateral quadriceps,biceps femoris RMS value were significantly decreased compared with normal control group(P<0.01),and health,ipsilateral RMS values significantly different(P<0.01);when knee,ipsilateral quadriceps and biceps femoris of RMS values are less than the normal control group,there was a significant difference(P<0.01),and health,ipsilateral RMS values significantly different(P<0.01);patients with contralateral medial femoral biceps muscle and the RMS value of the shares is less than the normal control group,but there was no significant difference(P>0.05);When knees,ipsilateral and contralateral CR greater than the normal control group,there was a significant difference(P<0.05);contralateral CR was less than normal control group showed no significant difference(P>0.05);knee extension,ipsilateral and contralateral CR were greater than the normal control group,there was a significant difference(P<0.05). Conclusion There are initiative antagonistic muscle coordination abnormal in the hemiplegic patients after stroke spastic muscle flexion ipsilateral healthy muscle.The SEMG technology in real-time quantitative evaluation of stroke patients after knee spastic muscle control disorders and active antagonistic muscle coordination,and provide a strong basis prognosis for the development and evaluation of rehabilitation programs.