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首页> 外文期刊>Journal of Neurophysiology >High-definition transcranial direct-current stimulation of the right M1 further facilitates left M1 excitability during crossed facilitation
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High-definition transcranial direct-current stimulation of the right M1 further facilitates left M1 excitability during crossed facilitation

机译：右M1的高清经颅直流刺激进一步促进了交叉促进期间留下了M1兴奋性

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摘要

The crossed-facilitation (CF) effect refers to when motor-evoked potentials (MEPs) evoked in the relaxed muscles of one arm are facilitated by contraction of the opposite arm. The aim of this study was to determine whether high-definition transcranial direct-current stimulation (HD-tDCS) applied to the right primary motor cortex (M1) controlling the left contracting arm [50% maximum voluntary isometric contraction (MVIC)] would further facilitate CF toward the relaxed right arm. Seventeen healthy righthanded subjects participated in an anodal and cathodal or sham HD-tDCS session of the right M1 (2 mA for 20 min) separated by at least 48 h. Single-pulse transcranial magnetic stimulation (TMS) was used to elicit MEPs and cortical silent periods (CSPs) from the left M1 at baseline and 10 min into and after right M1 HD-tDCS. At baseline, compared with resting, CF (i. e., right arm resting, left arm 50% MVIC) increased left M1 MEP amplitudes (+97%) and decreased CSPs (-11%). The main novel finding was that right M1 HD-tDCS further increased left M1 excitability (+28.3%) and inhibition (+21%) from baseline levels during CF of the left M1, with no difference between anodal and cathodal HD-tDCS sessions. No modulation of CSP or MEP was observed during sham HD-tDCS sessions. Our findings suggest that CF of the left M1 combined with right M1 anodal or cathodal HD-tDCS further facilitated interhemispheric interactions during CF from the right M1 (contracting left arm) toward the left M1 (relaxed right arm), with effects on both excitatory and inhibitory processing.
机译：交叉促进（CF）效应是指当通过相对臂的收缩促进在一个臂的松弛肌肉中诱发的电动诱发电位（MEP）。本研究的目的是确定应用于控制左侧收缩臂的右初级电机皮层（M1）的高清经颅直流刺激（HD-TDC）[50％最大自愿等距收缩（MVIC）]将进一步促进CF朝向轻松的右臂。 17个健康的虾科目参与了右侧M1（2 mA持续20分钟）的阳极和阴极或假HD-TDCS会议，分离至少48小时。单脉冲经颅磁刺激（TMS）用于在基线的左M1中引出MEPS和皮质静音时段（CSP），并在右M1 HD-TDC中的10分钟和之后。在基线时，与休息，CF（即，右臂休息，左臂50％MVIC）增加左M1 MEP振幅（+ 97％）和降低CSP（-11％）。主要新颖的发现是，右M1 HD-TDCS进一步增加左M1兴奋性（+ 28.3％）和从基线水平的抑制（+ 21％）的左M1的CF时，与阳极和阴极HD-TDCS会话之间没有差别。在假HD-TDCS会话期间没有观察到CSP或MEP的调节。我们的研究结果表明，左M1的CF与右M1 anoOdal或阴极HD-TDC组合在CF中进一步促进了在右侧M1（左臂）朝向左侧M1（松弛右臂）的互震性相互作用，对兴奋性和兴奋剂有影响抑制加工。

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