The effect of cold on the trigeminal reflexes

IF 0.4 4区 医学 Q4 NEUROSCIENCES Neurological Sciences and Neurophysiology Pub Date : 2021-10-01 DOI:10.4103/nsn.nsn_220_20
R. İnan, M. Erdemir-Kiziltan
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Abstract

Objective: Effects of muscle cooling on the spinal stretch and monosynaptic reflexes have been studied to describe the properties of Group I and II afferents of muscle spindles. Masseter muscle differs from extremity muscles in structural and numerical features of the muscle spindles. The aim of this study was to examine the muscle spindle afferent features of masseter muscle by applying cold to understand the role of Group I and II afferents in reflexes of masseter. Patients and Methods: We included 12 healthy subjects (7 females and 5 males) in the study. Masseter inhibitory reflex (MIR), jaw tendon reflex (JTR), trigeminal motor evoked potential (MEP), and trigeminal somatosensory evoked potential (SEP) were studied before and after cold application. Left masseter muscle was cooled down to 18°C. We compared the data obtained before and after cold application. Results: After cold application, the mean total duration of MIR was shortened and it was absent in four subjects. The mean amplitude of JTR was higher after cold application (P = 0.018) without any significant change in latency. The mean latency of MEP was delayed without any change in amplitude (P = 0.003). There was no significant difference in SEPs. Conclusions: Changes observed in MIR, JTR, and MEP could not be ascribed to any specific type of muscle spindle afferents. Delayed mean reflex latencies were attributed to the effect of cold on nerve conduction. Summation of peripheral cold and pain receptor features, spindle afferents, and cortical mechanisms might have caused cold-associated changes.
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寒冷对三叉神经反射的影响
目的:研究肌肉冷却对脊髓拉伸和单突触反射的影响,以描述肌梭I和II组传入神经的性质。咬肌在肌梭的结构和数量特征上不同于四肢肌肉。本研究旨在探讨咬肌的肌纺锤体传入特征,以了解第I组和第II组传入在咬肌反射中的作用。患者和方法:我们纳入了12名健康受试者,其中7名女性,5名男性。研究冷敷前后咬肌抑制反射(MIR)、颌腱反射(JTR)、三叉神经运动诱发电位(MEP)和三叉神经体感诱发电位(SEP)。左咬肌冷却至18℃。我们比较了冷敷前后获得的数据。结果:冷敷后,4例患者MIR平均总持续时间缩短,无MIR。冷敷后JTR平均振幅升高(P = 0.018),潜伏期无显著变化。MEP平均潜伏期延迟,幅度无变化(P = 0.003)。两组sep无显著性差异。结论:观察到的MIR、JTR和MEP的变化不能归因于任何特定类型的肌纺锤体传入。平均反射潜伏期延迟归因于寒冷对神经传导的影响。外周寒冷和疼痛受体特征、纺锤体传入和皮层机制的综合可能导致了与寒冷相关的变化。
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来源期刊
CiteScore
0.70
自引率
25.00%
发文量
4
审稿时长
26 weeks
期刊介绍: Neurological Sciences and Neurophysiology is the double blind peer-reviewed, open access, international publication organ of Turkish Society of Clinical Neurophysiology EEG-EMG. The journal is a quarterly publication, published in March, June, September and December and the publication language of the journal is English.
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