Svensson P, Bakke M, Michler L, Arendt-Nielsen L, Møller E
Department of Prosthetic Dentistry and Stomatognathic Physiology, Royal Dental College, University of Aarhus, Denmark.
J Oral Rehabil. 1998 Feb;25(2):128-34. doi: 10.1046/j.1365-2842.1998.00218.x.
Trigeminal sensory and motor responses to high-intensity electrical stimuli were studied in 10 healthy male subjects. During contraction at 10% of maximal bite force, late exteroceptive suppression periods assessed by EMG and bite force from masseter muscles were recorded together with evoked vertex potentials. Electrical stimuli were either delivered as 1 ms single pulses or as 21 ms (5 x 1 ms, 200 Hz) train pulses at two different intensities above the pain threshold. Three different perioral regions were stimulated in random order. The duration of the masseter suppression period was significantly longer and its latency significantly shorter at higher stimulus intensities whereas the amplitude of the evoked vertex potentials remained unchanged. Both the evoked potentials and the exteroceptive suppression period in the masseter muscle differed significantly between stimulation at the three perioral regions. The present results from combined measurements of sensory and motor responses in the trigeminal system may be explained by the function of trigeminal polysynaptic reflex circuits and the central cerebral processing of afferent inputs.
在10名健康男性受试者中研究了三叉神经对高强度电刺激的感觉和运动反应。在以最大咬合力的10%进行收缩时，通过肌电图和咬肌咬合力评估的晚期外感受抑制期与诱发的顶点电位一起记录。电刺激以1毫秒单脉冲或21毫秒（5×1毫秒，200赫兹）串脉冲的形式在高于疼痛阈值的两种不同强度下施加。以随机顺序刺激三个不同的口周区域。在较高刺激强度下，咬肌抑制期的持续时间明显更长，其潜伏期明显更短，而诱发顶点电位的幅度保持不变。在三个口周区域进行刺激时，咬肌中的诱发电位和外感受抑制期均存在显著差异。三叉神经系统中感觉和运动反应联合测量的当前结果可能由三叉多突触反射回路的功能以及传入输入的中枢大脑处理来解释。
