Neck rotation modulates motor-evoked potential duration of proximal muscle cortical representations in healthy adults

被引:0
|
作者
Alana B. McCambridge
Kayla Hay
Kumbelin Levin
Kirsty Philpott
Kunal Wood
Lynley V. Bradnam
机构
[1] University of Technology Sydney,Graduate School of Health, Discipline of Physiotherapy
[2] University of Auckland,Department of Exercise Sciences
[3] University of Auckland,Centre for Brain Research
来源
Experimental Brain Research | 2020年 / 238卷
关键词
Transcranial magnetic stimulation; Propriospinal; Motor-evoked potential; Motor cortex; Subcortical; Upper limb;
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中图分类号
学科分类号
摘要
Transcranial magnetic stimulation (TMS) produces motor-evoked potentials (MEP) used to infer changes in corticomotor excitability. In humans, neck rotation can probe reticulospinal input on corticomotor output. This study investigated the effect of neck rotation on MEP duration in a proximal and distal upper limb muscle and compared responses between rest and preactivation. Single-pulse TMS to motor cortex was used to evoke MEPs at two stimulus intensities in 18 healthy adults (20–40 years). Surface electromyography recorded MEPs from the non-dominant biceps brachii (BB) and first dorsal interosseous (FDI). Participants were seated with the target muscle at rest or 10% preactivated, and head rotated ipsilateral, contralateral, or in neutral position. The primary outcome was MEP tail, defined as the mean difference in MEP duration between active and rest trials. Secondary outcomes were MEP duration and amplitude. MEP tail was modulated by neck rotation in the proximal BB (P = 0.03) but not distal FDI (P > 0.19), with shorter duration during ipsilateral or contralateral rotation relative to neutral. In a neutral neck position, MEP duration was prolonged by muscle preactivation and higher TMS intensities in the FDI and BB (P < 0.03). Neck rotation attenuated the prolongation of MEP duration during preactivation in the BB, but not the FDI. Neck rotation had no effect on MEP amplitude for either muscle (P > 0.05). Modulation of the late portion of the MEP by rotation of the neck could indicate subcortical projections to alpha-motoneuron pools are stronger in proximal than distal upper limb muscles. These findings may have relevance for using MEP duration as a neural biomarker in neurological diseases.
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页码:2531 / 2538
页数:7
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