The Study Of SEMG On The Timing Of The Muscles Activation At Stance Phase Of Walking Among Different Stages Of Stroke Patients

Objective To observe the changes of the sEMG on the lower extremity muscles’activation timing at stance phase of walking among the different recovery stages of stroke patients.Method All the stroke patients those treated inpatient and outpatient were assessed by the Brunnstrom stage scale.10 patients were randomly selected from the patients those assessed as the Brunnstrom stage Ⅲ(Group A).10 patients were randomly selected from the patients those assessed as the Brunnstrom stage Ⅳ(Group B)and 10 patients were randomly selected from the patients those assessed as the Brunnstrom stage Ⅴ(Group C).The sEMG based 3D gait analysis was used to assessed the gait for all the patients in the three groups.The activation timing of the both side muscles such as Rectus femoris(RF)and Biceps femoris(BF)and Tibialis anterior(TA)and Gastrocnemius medialis(GM)were detected by the method of Visual Threshold from the raw sEMG signal by the specific software.Compare the difference of the gait and the timing of the muscles activation among the 3 groups.Result 1.There were significant deviation between the affected and unaffected side for the step length and the percentage of the stance phase during the whole gait cycle in the group A and Group B(P<0.05)while that showed no significant deviation in the Group C(P>0.05);The walking speed and the step length of the affected side and the percentage of the stance phase during the whole gait cycle showed significant deviation among the three groups(P<0.05);The gait symmetry between Group C and Group B also between Group C and Group A both showed significant deviation(P<0.05);2.The onset time of RF and BF at affected side and the duration of the BF activation time at unaffected side in Group B showed significant deviation as against the Group A(p<0.05);The onset time of GM at affected side and the duration of TA and GM activation duration at unaffected side in Group C showed significant deviation as against the Group B(p<0.05);The onset time of TA at unaffected side and GM at affected side in Group C showed significant deviation as against the Group A(p<0.05);3.The onset time of RF and BF at affected side and the duration of BF activation at affected showed significant deviation as against the unaffected side in Group A(p<0.05);The onset time of TA and GM at affected side showed significant deviation as against the unaffected side in Group B(p<0.05);The onset time of TA at affected side showed significant deviation as against the unaffected side in Group C(p<0.05);The symmetrical difference of the activation timing between the both sides muscles except the BF and GM among the 3 groups showed less significant deviation(P>0.05);4.The co-activation time of RF-BF and TA-GM at unaffected side showed significant deviation as against the affected side in Group A(P<0.05);The co-activation time of RF-BF and TA-GM at unaffected side in Group B showed significant deviation as against the Group A(P<0.05);The co-activation time of RF-BF and TA-GM at unaffected side in Group C showed significant deviation as against the Group A and Group B(P<0.05).Conclusion The abnormality of the lower extremity muscles’ activation timing when the stroke patients walking at stance phase was appeared to be less associated with the recovery of walking ability and gait.The recovery of the lower extremity muscles’ activation timing at walking performed discordant among different stages of stroke patients.We found that the muscles’ over activation of the unaffected side was decreased as the motor function getting better while the activation timing of the lower extremity muscles of affected side showed the characteristic changes then the targeted therapy could be taken for the changes.