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首页> 外文期刊>The European Journal of Neuroscience >An acute bout of exercise modulates both intracortical and interhemispheric excitability
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An acute bout of exercise modulates both intracortical and interhemispheric excitability

机译：急性锻炼调节了内耳和间际兴奋性

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Abstract Primary motor cortex (M1) excitability is modulated following a single session of cycling exercise. Specifically, shortinterval intracortical inhibition and intracortical facilitation are altered following a session of cycling, suggesting that exercise affects the excitability of varied cortical circuits. Yet we do not know whether a session of exercise also impacts the excitability of interhemispheric circuits between, and other intracortical circuits within, M1. Here we present two experiments designed to address this gap in knowledge. In experiment 1, single and paired pulse transcranial magnetic stimulation (TMS ) were used to measure intracortical circuits including, shortinterval intracortical facilitation (SICF ) tested at 1.1, 1.5, 2.7, 3.1 and 4.5爉s interstimulus intervals (ISI s), contralateral silent period (CSP ) and interhemispheric interactions by measuring transcallosal inhibition (TCI ) recorded from the abductor pollicus brevis muscles. All circuits were assessed bilaterally pre and two time points post (immediately, 30爉in) moderate intensity lower limb cycling.SICF was enhanced in the left hemisphere after exercise at the 1.5爉sISI . Also,CSP was shortened andTCI decreased bilaterally after exercise. In Experiment 2, corticospinal and spinal excitability were tested before and after exercise to investigate the locus of the effects found in Experiment 1. Exercise did not impact motorevoked potential recruitment curves, Hoffman reflex or Vwave amplitudes. These results suggest that a session of exercise decreases intracortical and interhemispheric inhibition and increases facilitation in multiple circuits within M1, without concurrently altering spinal excitability. These findings have implications for developing exercise strategies designed to potentiate M1 plasticity and skill learning in healthy and clinical populations.
机译：摘要在单一​​循环锻炼后调制初级电机皮质（M1）兴奋性。具体地，在循环会话之后改变了短暂的内部抑制和内部促进促进，表明运动影响了各种皮质电路的兴奋性。然而，我们不知道锻炼会话也影响了在M1内部的间歇性电路的兴奋性和其他内部气体电路。在这里，我们展示了两个实验，旨在解决知识的这种差距。在实验1中，使用单一和配对脉冲经颅磁刺激（TMS）来测量内部气体电路，包括在1.1,1.5,2.7,3.1和4.5°S的间隔（ISI S），对侧静音时测试的短处理促进（SICF）。通过测量从Abductor Pollicus Brevis肌肉中记录的转段抑制（TCI）来滴眼的时期（CSP）和互脱间球相互作用。所有电路都被评估双侧前和两个时间点（立即，30次）中等强度下肢循环。在1.5‰SISI运动后左半球增强了左半球。此外，缩短了CSP，运动后双侧下降。在实验2中，运动前后测试皮质脊髓和脊髓兴奋性，以研究实验中发现的效果的轨迹。运动没有影响MotoreVoked潜在的招募曲线，霍夫曼反射或V波振荡。这些结果表明，运动会话降低了鞘内和卵闭的抑制，并在M1内的多个电路中增加了促进，而不同时改变脊髓兴奋性。这些调查结果对开发旨在提高M1可塑性和健康和临床群体技能学习的运动策略的影响。

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