Wallinga-De Jonge W, Gielen F L, Wirtz P, De Jong P, Broenink J
Electroencephalogr Clin Neurophysiol. 1985 Jun;60(6):539-47. doi: 10.1016/0013-4694(85)91115-0.
The time course of the intracellular action potential was studied quantitatively, because it is an important factor in the generation of electromyographic signals. In in vivo preparations of the m. EDL and m. soleus of the rat single motor units were stimulated and intracellular action potentials were recorded in muscle fibres belonging to those motor units. In this arrangement it was possible to relate the intracellular action potential to the fibre type. The intracellular action potentials of fast twitch glycolytic (FTG) EDL and of slow soleus fibres were described, using 8 characteristics. All characteristics but one differed significantly between the two fibre populations. Comparing characteristics of intracellular action potentials of FTG fibres with slow fibres, it is concluded that: the resting membrane potential is more negative; the amplitude of the action potential is larger; the maximum rates of depolarization and repolarization are higher; and the shape of the repolarization phase is more variable.
由于细胞内动作电位是产生肌电信号的一个重要因素，因此对其时间进程进行了定量研究。在大鼠的趾长伸肌和比目鱼肌的体内制备中，刺激单个运动单位，并在属于这些运动单位的肌纤维中记录细胞内动作电位。在这种设置下，可以将细胞内动作电位与纤维类型联系起来。使用8个特征描述了快缩糖酵解型（FTG）趾长伸肌纤维和慢比目鱼肌纤维的细胞内动作电位。除了一个特征外，这两种纤维群体的所有特征都有显著差异。比较FTG纤维和慢纤维的细胞内动作电位特征，可以得出以下结论：静息膜电位更负；动作电位幅度更大；去极化和复极化的最大速率更高；复极化阶段的形状更具变异性。
