Cattagni Thomas, Merlet Angèle N, Cornu Christophe, Jubeau Marc
Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, University of Nantes, Nantes, France.
Clin Physiol Funct Imaging. 2018 May;38(3):416-424. doi: 10.1111/cpf.12431. Epub 2017 Apr 26.
This study aimed to compare the effect of different types of pressure applied to the stimulation electrode on assessing the efficiency of Ia-α-motoneuron transmission of the soleus muscle and the associated discomfort using electrical nerve stimulation. Twelve healthy young adults participated in three experimental sessions (one for each knee angle). The amplitudes of the maximal Hoffmann reflex (H ) and motor potential (M ) were recorded from the soleus muscle at 0°, 30° and 90° knee angles (0° full extension) through three pressure applications to the stimulation electrode: no pressure, pressure with manual application and pressure using adhesive tape. The soleus H /M were calculated to assess the efficiency of Ia-α-motoneuron transmission during varied knee angles and pressure application to the stimulation electrode. At the stimulation intensity evoking soleus H and M , subjects were asked to orally provide a value between 'no discomfort' (0) and 'worst possible discomfort' (10). The application of pressure on the stimulation electrode, particularly using adhesive tape, decreased both the stimulation intensity needed to evoke an electrophysiological response and the associated self-reported discomfort (P<0·05), while the H /M remained constant. At the stimulation intensity evoking M , the electrical stimulation appeared to be more painful at 0° knee angle compared with 30° and 90° angles (P<0·01). To conclude, this study showed that a knee flexion and a pressure application to the stimulation electrode, especially using tape pressure, are recommended in the objective to reduce the patient/subjects' discomfort when eliciting evoked potentials on soleus muscle.
本研究旨在比较施加于刺激电极的不同类型压力对评估比目鱼肌Ia-α运动神经元传递效率及使用电神经刺激时相关不适的影响。12名健康青年成年人参与了三个实验环节（每个膝关节角度一个环节）。通过对刺激电极施加三种压力：无压力、手动施加压力和使用胶带施加压力，在膝关节角度为0°、30°和90°（0°为完全伸展）时记录比目鱼肌的最大霍夫曼反射（H）和运动电位（M）的幅度。计算比目鱼肌的H/M以评估在不同膝关节角度和对刺激电极施加压力时Ia-α运动神经元的传递效率。在诱发比目鱼肌H和M的刺激强度下，要求受试者口头给出一个介于“无不适”（0）和“可能的最严重不适”（10）之间的值。对刺激电极施加压力，尤其是使用胶带施加压力，既降低了诱发电生理反应所需的刺激强度，也降低了相关的自我报告不适（P<0.05），而H/M保持不变。在诱发M的刺激强度下，与30°和90°角度相比，在膝关节角度为0°时电刺激似乎更疼痛（P<0.01）。总之，本研究表明，为了在引出比目鱼肌诱发电位时减少患者/受试者的不适，建议膝关节屈曲并对刺激电极施加压力，尤其是使用胶带压力。
