Gündüz Ayşegül, Ayas Selahattin, Kofler Markus, Aydın Şenay, Kızıltan Meral Erdemir
Department of Neurology, Cerrahpasa School of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey.
Department of Neurology, Hochzirl Hospital, Zirl, Austria.
Neurol Sci. 2021 Feb;42(2):633-637. doi: 10.1007/s10072-020-04557-5. Epub 2020 Jul 10.
The post-inhibition excitatory phase (E3) of the cutaneous silent period (CSP) is attributed to the resynchronization of motoneuron activity following the inhibitory period but there is also evidence that a somatosensory startle reflex may contribute to this phase. We hypothesized that the startle reflex component contained in E3 will decrease during vibration.
Sixteen healthy individuals were included in the study. CSP was recorded from slightly contracted right thenar muscles after painful index finger stimulation, before, during, and immediately after vibration. The values of the percentage change of E3 relative to pre-stimulus baseline (E3%) were compared before, during, and after vibration for each individual.
There was a reduction in E3% during vibration and the values returned to normal immediately after vibration (153.1 ± 43.5%, 115.2 ± 30.2%, 154.9 ± 68.2%, respectively; p = 0.030).
E3 is reduced during vibration in healthy individuals, presumably due to suppression of a reflex component, which is superimposed upon the known resynchronization of motoneurons.
皮肤静息期（CSP）的抑制后兴奋期（E3）归因于抑制期后运动神经元活动的重新同步，但也有证据表明体感惊吓反射可能对此阶段有影响。我们假设E3中包含的惊吓反射成分在振动过程中会减少。
16名健康个体纳入本研究。在对食指进行疼痛刺激之前、期间和之后，记录右手小鱼际肌轻微收缩时的CSP。比较每个个体在振动前、振动期间和振动后E3相对于刺激前基线的变化百分比（E3%）值。
振动期间E3%降低，振动后立即恢复正常（分别为153.1±43.5%、115.2±30.2%、154.9±68.2%；p = 0.030）。
健康个体在振动过程中E3降低，可能是由于叠加在已知运动神经元重新同步之上的反射成分受到抑制。
