M-wave properties during progressive motor unit activation by transcutaneous stimulation
M-wave properties during progressive motor unit activation by transcutaneous stimulation
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DOI：
10.1152/japplphysiol.00064.2004
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发表时间：
2004-08-01
影响因子：
3.3
通讯作者：
Merletti, R
中科院分区：
文献类型：
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作者：
Farina, D;Blanchietti, A;Merletti, R
本研究的目的是解释在实验记录的M波与渐进运动单位（MU）激活的基础上模拟的表面肌电图的变化。通过研究电诱发收缩过程中M波平均整流值、频谱特性和传导速度（CV），分析经皮电刺激过程中的激活顺序。用8个电极组成的线性粘贴阵列检测了10名健康男性肱二头肌的M波。以恒定的电流强度（40、60、80和100%的超大刺激电流）或线性增加的电流将电刺激传递到运动点。一个模型的表面肌电图生成不同的激活顺序的基础上MU的大小和位置被用来解释实验结果。通过实验和模型分析发现：1）MUs有从低CV到高CV，从表面到表面激活的趋势，（吉普车肌肉层与肱二头肌肌肉的增加经皮电刺激，M波的特征频谱频率除受平均CV的影响外，还受许多因素的影响（例如MU位置的激活顺序或MU神经支配区和CV的扩展），因此在进行性MU激活期间随着CV的伴随增加而降低。
The aim of this study was to interpret changes in experimentally recorded M waves with progressive motor unit (MU) activation based on simulation of the surface electromyogram. Activation order during transcutaneous electrical stimulation was analyzed by investigating M-wave average rectified value, spectral properties, and conduction velocity (CV) during electrically elicited contractions. M-waves were detected from the biceps brachii muscle of 10 healthy male subjects by a linear adhesive array of eight electrodes. Electrical stimulation was delivered to the motor point at either constant current intensity (40, 60, 80, and 100% of the supramaximal stimulation current) or with linearly increasing current. A model of surface electromyogram generation that varied activation order based on MU size and location was used to interpret the experimental results. From the experimental and model analysis, it was found that 1) MUs tended to be activated from low to high CV and from the superficial to the (Jeep muscle layers with increasing transcutaneous electrical stimulation of the biceps brachii muscle, and 2) characteristic spectral frequencies of the M-wave were affected by many factors other than average CV (such as the activation order by MU location or the spread of the MU innervation zones and CVs), thus decreasing with a concomitant increase in CV during progressive MU activation.