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Related Experiment Video

Updated: Mar 15, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention

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Acute aerobic exercise modulates primary motor cortex inhibition.

Ronan A Mooney1,2, James P Coxon3,2, John Cirillo1,2

  • 1Movement Neuroscience Laboratory, The University of Auckland, Auckland, New Zealand.

Experimental Brain Research
|September 4, 2016
PubMed
Summary

Aerobic exercise may reduce gamma-aminobutyric acid B (GABA_B)-mediated inhibition in the primary motor cortex (M1). This study found reduced long-interval intracortical inhibition (LICI) after a single bout of aerobic exercise, suggesting a potential mechanism for exercise-induced neuroplasticity.

Keywords:
Aerobic exerciseIntracortical inhibitionMotor cortexTranscranial magnetic stimulation

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Last Updated: Mar 15, 2026

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Motor Control

Background:

  • Aerobic exercise is known to enhance neuroplasticity, but the underlying neural mechanisms are not fully understood.
  • A potential mechanism involves the primary motor cortex (M1) and the down-regulation of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA).

Purpose of the Study:

  • To investigate how corticomotor excitability (CME) and M1 intracortical inhibition are affected by a single session of moderate-intensity aerobic exercise.
  • To explore the role of GABAergic pathways in exercise-induced changes in motor cortex function.

Main Methods:

  • Ten healthy adults underwent transcranial magnetic stimulation (TMS) to assess CME and intracortical inhibition (SICI, LICI, LCD) before and after a 30-minute aerobic exercise session.
  • A control session without exercise was also performed to isolate the effects of exercise.
  • Exercise was conducted on a cycle ergometer at 60% of VO2 peak.

Main Results:

  • A significant reduction in long-interval intracortical inhibition (LICI) was observed at 10 and 20 minutes post-exercise compared to baseline.
  • No significant changes were found in corticomotor excitability (CME), cortical silent period (SP) duration, short-interval intracortical inhibition (SICI), or late cortical disinhibition (LCD).

Conclusions:

  • Acute aerobic exercise may lead to a down-regulation of GABA_B-mediated intracortical inhibition in the primary motor cortex.
  • These findings suggest a potential neural mechanism through which aerobic exercise influences M1 plasticity, although further research is needed.