Introduction

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.

Methods

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.

Results

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).

Discussion

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.

中文翻译：

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在皮肤静默期后，通过振动调节兴奋期。

介绍

皮肤静默期（CSP）的抑制后兴奋期（E3）归因于抑制期后运动神经元活性的重新同步，但也有证据表明，体感惊吓反射可能参与了该阶段。我们假设E3中包含的惊吓反射成分在振动过程中会减少。

方法

该研究包括十六名健康个体。在疼痛的食指刺激后，振动之前，期间和之后，从略微收缩的右上角肌肉记录CSP。比较每个个体在振动之前，期间和之后，E3相对于刺激前基线的变化百分比（E3％）的值。

结果

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）。

讨论区

在健康个体的振动过程中，E3降低，可能是由于抑制了反射分量，该反射分量叠加在已知的运动神经元再同步上。