估计肌肉中运动单位数量的新方法。
New methods of estimating the number of motor units in a muscle.
作者信息
Milner-Brown H S, Brown W F
出版信息
J Neurol Neurosurg Psychiatry. 1976 Mar;39(3):258-65. doi: 10.1136/jnnp.39.3.258.
Abstract
Two electrophysiological methods have been described for estimating the number of motor units (MU) in a muscle. The methods are based on the original methods of Mc Comas and others, which involve dividing the maximum compound potential (MCP) of muscle evoked by supramaximal electrical stimulation of nerve by a mean motor unit potential (MMUP). The important modifications in the methods are the incorporation of the fluctuations in the response of MU to electrical excitation and a possible correction for the overlap in the firing levels of motor axons. The methods have been used in the estimation of the number of motor units in the first dorsal interosseous, thenar, hypothenar, and extensor digitorum brevis muscles of normal subjects and patients with various neuromuscular disorders. The results indicate that previous motor unit estimates were in general erroneously high.
摘要
已经描述了两种用于估计肌肉中运动单位（MU）数量的电生理方法。这些方法基于麦科马斯等人的原始方法，该方法涉及将神经的超强电刺激诱发的肌肉最大复合电位（MCP）除以平均运动单位电位（MMUP）。这些方法的重要改进包括纳入运动单位对电刺激反应的波动以及对运动轴突放电水平重叠的可能校正。这些方法已用于估计正常受试者和患有各种神经肌肉疾病的患者的第一背侧骨间肌、鱼际肌、小鱼际肌和趾短伸肌中的运动单位数量。结果表明，以前对运动单位的估计总体上错误地偏高。
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