Characteristics of Dynamic Contractions on Surface Electromyography Single of Stroke Patients Induced from Low Limb Muscle When Exercising Passively, Exercising Initiatively with Assitant and Against Resistance / 中国康复理论与实践

@#Objective To investigate the characteristics of the dynamic contractions on the surface electromyography (sEMG) single of stroke patients induced from the low limb muscle when exercising passively, exercising initiatively with assistant and against resistance.Methods 24 stroke patients with hemiplegia and 17 normal subjects were tested with sEMG under a dynamic contractions in coxa and knee flexion and extension passively, initiatively with assistant and against resistance. The myoelectric signals were collected and processed by linear time and frequency domain method.Results The values of median frequency (MF) and mean power frequency (MPF) of stroke group were significantly lower, but the value of average EMG (AEMG) was higher ( P<0.001). The values of MF and MPF in activity side were lower than that in non-activity side ( P<0.001). The values of MF and MPF when exercising passively were higher than that when exercising with resistance ( P<0.05). The value of AEMG when exercising with resistance was highest. The values of MF and MPF in the synergist muscle were higher. The values of AEMG in the antagonistic muscle and synergist muscle were higher than that agonist and synergist muscle ( P<0.01). The values of MF and MPF in non-paretic exercising side were higher significantly, but in paretic exercising side and non-paretic silent side were lower. The values of MF and MPF in exercising side from vastus lateralis (VL) were the highest. The values of AEMG in exercising side and non-exercising side from biceps femoris (BF) were the highest. The values of MF and MPF in low limb of stroke group reduced, that in rectus femoris (RF) from paretic side was the lowest; that in BF from non-paretic side was the lowest ( P<0.01). The value of AEMG in low limb of stroke group was high significantly, especially in BF from the low limb of the non-paretic side in stroke patients. The values of AEMG in four group muscles gradually were higher following the higher exercising load, and that in the BF was the highest, and that in vastus medialis (VM) rose significantly.Conclusion The values of MF and MPF of stroke patients with hemiplegia reduce significantly, but the value of AEMG is higher. The values of MF and MPF in exercising side are lower than that in non-exercising side and non-paretic exercising side rising significantly, but that in paretic exercising side and non-paretic silent side reduce significantly. The values of MF and MPF in assistant exercise are higher than that in passive exercise and resistance exercise, but the value of AEMG in resistance exercise is higher than that in assistant exercise and in passive exercise. The values of MF and MPF in synergist muscle rise, but the values of AEMG in antagonist and synergist muscle are higher than that agonist and synergist muscle.

Antagonistic Co-contraction Ratios of Dynamic Contraction during Stroke Patient's Knees Exercise / 中国康复理论与实践

@#Objective To investigate the influence of dynamic contraction to antagonist coactivity ratios during the stroke patient's knees exercise passively initiatively and resistively.Methods 24 stroke patients as observation group and 17 normal subjects as control group had performed dynamic contractions in knee flexion and extension. The electromyography signals were collected by surface electrode and then processed by linear time-and frequency-domain method. And then the antagonistic coactivity ratio was analyzed with factors statistics.Results The antagonist coactivity ratios of MF(median frequency) and MPF(mean power frequency) in paretic side of patients got high significantly but in non-paretic side got low significantly. But the antagonistic coactivity ratios of AEMG(average EMG) in paretic side got low and in non-paretic side got high significantly (P<0.01). The antagonist coactivity ratios of MF and AEMG in activity side were lower than in non-activity side (P<0.05). The antagonist coactivity ratios of MPF in exercise passively were lower significantly. The antagonist coactivity ratios of AEMG were lower following as the work load increased (P<0.001).Conclusion The motor unites are collected excessively in antagonist from paretic side of the stroke patient. The level of the synchronization of the excitement got low. The muscle strength got weak. But both the motor unites collected and the motor unites excited in antagonist from non-paretic side are excessive. The muscle strength get strong.

Effect of Dynamic Contractions on sEMG Co-contraction Ratio Taken from Antagonist Muscles of Knee Joint in Stroke Patients at Convalescence Stage / 中国康复理论与实践

@#Objective To observe the influence of dynamic contractions on the sEMG co-contraction ratio taken from the antagonist muscles of the knee joint of stroke patients.Methods 11 stroke patients and 14 healthy subjects were measured the dynamic contractions in both knee flexion and extension with the surface electromyography(sEMG).Results There was no significant differences of the median frequency(MF),mean power frequency(MPF),average EMG(AEMG)and the sEMG co-contraction ratio within the stroke patients and the healthy(P>0.05).There was no significant difference of the MF between the patients compared with the healthy(P>0.05),but the sEMG co-contraction ratio of the MPF increased significantly and that of AEMG decreased significantly(P<0.01).Conclusion The MPF,AEMG and the sEMG co-contraction ratio taken from the stoke patients may reflect the characters of the low limb muscle and the MF may not.

The sEMG Characteristics of the Lower Limbs Muscles in Stroke Patients / 中国运动医学杂志

Objective To observe the surface electromyogram(sEMG)characteristics of the lower limbs muscles in stroke patients and healthy subjects during the passive and active-assisted anti-resistance movements.Methods Twenty four stroke patients and 17 healthy individuals(control group) participated in this study.sEMG of rectus femoris(RF),vastus lateralis(VL),ventralis medialis(VM)and biceps femoris(BF)was recorded during passive and active-assisted anti-resistance of knee joint in both groups.Average EMG(AEMG),mean power frequency(MPF)and median frequency(MF) were analyzed.Results Multiple factor ANOVA showed that very significant differences in the values of MF,MPF and AEMG between non-paretic and the paretic limbs appeared(P

The relationship between the visual-spatial perception impairment and characteristics of asymptomatic cerebral infarction / 中华物理医学与康复杂志

Objective To observe the relationship between visual-spatial perception impairment and the characteristics of asymptomatic cerebral infarction (ACI). Methods After evaluating the cognitive impairment of 112 patients with ACI using the Revised Visual Retention Test (VRT), we compared the result of VRT test among different groups grouped by number, size and location of the cerebral infarction. Results The total score of the patients with ACI with correct answers in VRT was significantly lower than that of the controls (14.5?3.2 vs 22.8?3.3, P

Predicting the motor recovery in stroke patients by use of cerebral blood flow:a pilot study / 中华物理医学与康复杂志

Objective To explore the value cerebral blood flow in prediction of motor recovery of stroke patients. Methods After evaluating the cerebral blood flow velocities of bilateral middle cerebral arteries with TCD during passive elbow movement, 68 patients with cerebral infarction were treated by rehabilitation therapy. The motor function of upper limbs was evaluated with Fugl Meyer before and after 6,12 weeks of treatment. The patients were divided into groups A and B according to the Fugl Meyer scales score of the paralytic upper limb at 12 weeks and the changes of cerebral blood velocities were compared between the two groups. Results The score of upper limb motor function were not different between group B and A before the treatment, but the score of group B was significantly higher than that of group A ( P

Rehabilitation and functional prognosis of acute brain infarct complicated with depression / 中国组织工程研究

Objective To observe rehabilitation and functional prognosis of patients suffered from brain infarction of acute phase complicated by depression. Method We selected 38 cases of acute brain infarct complicated with depression disorder as depression group, 40 cases of non－ depression patient admitted at the same period were selected as non depression group.Antidepressants drugs administration and rehabilitation therapy were performed.We evaluated patients according to functional independence measure(FIM)of Chinese edition. HAMD grading comparison was carried out in depression group. Result Before treatment,two groups score nearly the same,compared with pretreatment. After treatment,patients in depression group and non depression group showed significant improvement esp non－ depression group (P<0.01).11 cases with severe depression in the depression showed no changes in FIM score before and after treatment. Conclusion Compared with non－ depression patients,functional recovery of patients with depression following brain infarction of acute stage is much slower,especially for patients with severe depression.