Experimental jaw-muscle pain does not change heteronymous H-reflexes in the human temporalis muscle
Experimental jaw-muscle pain does not change heteronymous H-reflexes in the human temporalis muscle
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实验性下颌肌肉疼痛不会改变人类颞肌的同义 H 反射
DOI：
10.1007/s002210050464
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发表时间：
1998
影响因子：
2
通讯作者：
L. Arendt
中科院分区：
文献类型：
--
作者：
P. Svensson;A. De Laat;T. Graven‐Nielsen;L. Arendt
摘要 肌肉疼痛一般对口腔面部自主运动功能有抑制作用。然而，目前尚不清楚肌肉疼痛是否会直接或间接改变运动神经元的兴奋性。本研究采用单极针刺激技术，在左侧咬肌诱发直接运动反应(M反应)，在左侧颞肌诱发异名H反射，作为运动神经元兴奋性的间接测量。在11名健康受试者进行实验性颌肌疼痛前、中、后，分别在最大自主收缩(MVC)的50%处给予20次重复电刺激。疼痛是通过向右侧咬肌中部注入标准的高渗(5%)生理盐水而产生的。100 mm视觉模拟评分平均疼痛强度为42±5 mm。所有受试者均可诱发出短潜伏期反应(小于6ms)。对颞部H反射的潜伏期和波幅的分析表明，颌肌疼痛没有明显的影响。疼痛状态下的咀嚼肌M-反应波幅显著小于疼痛状态(ANOVA，P=0.018)，但疼痛前状态与疼痛后状态之间的差异无统计学意义。在9名受试者中，M反应后，同侧咬肌出现刺激后时程(平均偏移潜伏期为69.6±8.6ms)，肌电活动明显抑制(超过50%)(平均偏移潜伏期为5.5±0.2ms)。这些反射反应在疼痛条件下没有表现出系统性的变化。总而言之，急性对侧颌肌疼痛似乎不会调节异名H反射所测量的运动神经元的兴奋性。
Abstract Muscle pain generally has an inhibitory effect on voluntary orofacial motor function. However, it is not known whether muscle pain causes direct or indirect changes in motoneuron excitability. In this study a monopolar needle stimulation technique was used to evoke the direct motor response (M-response) in the left masseter muscle and the heteronymous H-reflex in the left temporalis muscle as an indirect measure of motoneuron excitability. Series of 20 repeated electrical stimuli were delivered at 50% of maximal voluntary contraction (MVC) before, during, and after periods with experimental jaw-muscle pain in 11 healthy subjects. Pain was induced by standardized infusion of hypertonic (5%) saline into the mid-portion of the right masseter muscle. The mean pain intensity rating on a 100-mm visual analog scale was 42±5 mm. The short-latency responses (less than 6 ms) could be evoked in all subjects. Analysis of the latency and amplitude of the temporal H-reflex indicated no significant effect of jaw-muscle pain. The amplitude of the masseteric M-response was significantly smaller in the postpain condition than in the pain conditions (ANOVA, P=0.018), but no differences were found between the prepain and postpain conditions. In nine subjects, poststimulus periods (mean offset latency, 69.6±8.6 ms) with significantly (more than 50%) suppressed EMG activity were detected in the ipsilateral masseter muscle following the M-response (mean offset latency, 5.5±0.2 ms). These reflex responses did not show a systematic change during the pain conditions. In conclusion, acute contralateral jaw-muscle pain does not seem to modulate the motoneuron excitability as measured by the heteronymous H-reflex.
有证据表明肌电图平均值的峰值有时可能是由运动神经元的抑制引起的。
影响因子：
2.5
作者：
Widmer,CG;Lund,JP
通讯作者：
Lund,JP
影响因子：
2.1
作者：
LUND, JP;DONGA, R;STOHLER, CS
通讯作者：
STOHLER, CS