Unité d'Etude du Mouvement (UEM), ULB-Erasme, 808 Route de Lennik, 1070, Bruxelles, Belgium.
J Neuroeng Rehabil. 2013 Sep 24;10:100. doi: 10.1186/1743-0003-10-100.
Recent studies suggest that surface muscular functional electrical stimulation (FES) might suppress neurological upper limb tremor. We assessed its effects on upper limb physiological tremor, which is mainly driven by mechanical-reflex oscillations. We investigated the interaction between FES and augmented visual feedback, since (a) most daily activities are performed using visual cues, and (b) augmented visual feedback exacerbates upper limb tremor.
10 healthy subjects (23.4 ± 7.7 years) performed 2 postural tasks with combinations of FES (4 sites; frequency of stimulation: 30 Hz; pulse width: 300 microsec; range of current delivered 10-34 mAmp) and augmented visual feedback.
Spectral analysis of tremor showed a decrease of power spectral density to 62.18% (p = 0.01), of the integral in the 8-12 Hz frequency band to 57.67% (p = 0.003), and of tremor root mean square (RMS) to 57.16% (p = 0.002) during FES, without any changes in tremor frequency. Augmented visual feedback blocked the beneficial effect of FES, as confirmed by power spectral analysis (p = 0.01). We found a statistically significant interaction between augmented visual feedback and electrical stimulation (p = 0.039).
Augmented visual feedback antagonizes the effects of FES on physiological tremor. The absence of changes of peak frequency argues against an effect of FES on mechanical properties of the upper limb.
最近的研究表明，表面肌电刺激（FES）可能抑制神经系统引起的上肢震颤。我们评估了其对上肢生理性震颤的影响，生理性震颤主要由机械反射性震荡驱动。我们研究了 FES 与增强视觉反馈之间的相互作用，因为（a）大多数日常活动都是使用视觉线索进行的，（b）增强的视觉反馈会加剧上肢震颤。
10 名健康受试者（23.4 ± 7.7 岁）在 FES（4 个部位；刺激频率：30 Hz；脉冲宽度：300 微秒；输送电流范围为 10-34 mAmp）和增强视觉反馈的组合下进行了 2 项姿势任务。
震颤的频谱分析显示，功率谱密度降低了 62.18%（p = 0.01），8-12 Hz 频带的积分降低了 57.67%（p = 0.003），震颤均方根（RMS）降低了 57.16%（p = 0.002），而震颤频率没有变化。增强视觉反馈阻断了 FES 的有益作用，这通过功率谱分析得到了证实（p = 0.01）。我们发现增强的视觉反馈和电刺激之间存在统计学上显著的相互作用（p = 0.039）。
增强的视觉反馈拮抗了 FES 对生理性震颤的影响。由于 FES 对上肢机械性能没有影响，所以没有改变峰值频率。
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