Kumagai K, Yamada M
Department of Paediatrics, Kanagawa Rehabilitation Hospital, Japan.
Acta Paediatr Jpn. 1991 Apr;33(2):228-37. doi: 10.1111/j.1442-200x.1991.tb01548.x.
Surface EMG motor unit action potentials (MUAPs), recorded with "array" or "matrix" types of electrodes, can be seen to propagate from the motor end plates in both directions along the muscle fibers. We attempted to obtain diagnostic information in muscle disease by using the multichannel surface EMG. The subjects examined were 28 normal controls (5-40 years old), seven patients with myopathy and three patients with neuropathy. The tibialis anterior and the biceps brachii muscles were investigated at weak and moderate contraction levels. In normal muscles, the mean muscle fiber conduction velocity increased with muscle force. In four of seven cases with myopathy, the conduction velocities were reduced compared to normal subjects (p less than 0.01), and there was little or no correlation between the conduction velocity and muscle force. In Duchenne muscular dystrophy, abnormal propagation patterns of MUAPs were obtained. The conduction velocities were within the normal range in the muscles of patients with neuropathy. However, abnormal MUAPs, giant and fasciculation potentials, and diminished discharge patterns of motor units (MUs) were detected during voluntary contraction and at rest in neuropathy.
使用“阵列”或“矩阵”型电极记录的表面肌电图运动单位动作电位（MUAPs），可观察到其从运动终板沿肌纤维向两个方向传播。我们试图通过使用多通道表面肌电图来获取肌肉疾病的诊断信息。接受检查的受试者包括28名正常对照者（年龄5至40岁）、7名肌病患者和3名神经病患者。在弱收缩和中等收缩水平下对胫前肌和肱二头肌进行了研究。在正常肌肉中，平均肌纤维传导速度随肌肉力量增加而升高。在7例肌病患者中的4例中，与正常受试者相比传导速度降低（p小于0.01），且传导速度与肌肉力量之间几乎没有相关性。在杜兴氏肌营养不良症中，获得了MUAPs的异常传播模式。神经病患者肌肉的传导速度在正常范围内。然而，在神经病患者的随意收缩期间及静息时，检测到了异常的MUAPs、巨大电位和肌束震颤电位，以及运动单位（MUs）放电模式减弱。
