MOTOR UNIT PROPERTIES OF BICEPS BRACHII IN CHRONIC STROKE PATIENTS ASSESSED WITH HIGH-DENSITY SURFACE EMG
MOTOR UNIT PROPERTIES OF BICEPS BRACHII IN CHRONIC STROKE PATIENTS ASSESSED WITH HIGH-DENSITY SURFACE EMG
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DOI：
10.1002/mus.21090
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发表时间：
2009-02-01
期刊：
影响因子：
3.4
通讯作者：
Hermens, Hermie J.
中科院分区：
文献类型：
--
作者：
Kallenberg, Laura A. C.;Hermens, Hermie J.
本研究的目的是利用高密度表面肌电图（sEMG）研究中风后患者肱二头肌的运动单位（MU）特征。十八名慢性偏瘫中风患者参与其中。评估上肢的 Fugl-Meyer 评分。受试者进行等长步进收缩，其力量水平为 5%-50% 最大自主收缩，同时用二维 16 通道电极阵列记录肱二头肌的 sEMG。双方都重复了这一过程。从 EMG 信号中提取运动单位动作电位（MUAP），并计算其均方根值（RMSMUAP，反映 MU 大小）和功率谱平均频率（FMEAN（MUAP），反映募集阈值）。受影响侧的 FMEAN(MUAP) 小于未受影响侧，表明低阈值 MU 的贡献增加，可能与高阈值 MU 的退化有关。受影响侧的 RMSMUAP 除以未受影响侧的 RMSMUAP 比率与 Fugl-Meyer 评分显着相关。该比率可以反映受影响一侧发生神经支配的程度。
The aim of this study was to investigate motor unit (MU) characteristics of the biceps brachii in poststroke patients using high-density surface electromyography (sEMG). Eighteen chronic hemiparetic stroke patients took part. The Fugl-Meyer score for the upper extremity was assessed. Subjects performed an isometric step contraction consisting of force levels from 5%-50% maximal voluntary contraction while sEMG of the biceps brachii was recorded with a two-dimensional 16-channel electrode array. This was repeated for both sides. Motor unit action potentials (MUAPs) were extracted from the EMG signals, and their root-mean-square value (RMSMUAP, reflecting MU size) and mean frequency of the power spectrum (FMEAN(MUAP), reflecting recruitment threshold) were calculated. FMEAN(MUAP) was smaller on the affected than on the unaffected side, indicating an increased contribution of low-threshold MUs, possibly related to degeneration of high-threshold MUs. The ratio of RMSMUAP on the affected side divided by that on the unaffected side correlated significantly with the Fugl-Meyer score. This ratio may reflect the extent to which reinnervation has occurred on the affected side.