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Related Experiment Video

Updated: Feb 26, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Decrease in short-latency afferent inhibition during corticomotor postexercise depression following repetitive finger

Shota Miyaguchi1, Sho Kojima1, Ryoki Sasaki1

  • 1Institute for Human Movement and Medical Sciences Niigata University of Health and Welfare Niigata Japan.

Brain and Behavior
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

Postexercise depression (PED) involves reduced corticomotor excitability. This study found that cholinergic circuits, not GABAergic ones, are less active during PED after nonfatiguing movement.

Keywords:
motor evoked potentialpostexercise depressionrepetitive finger movementshort‐interval intracortical inhibitionshort‐latency afferent inhibitiontranscranial magnetic stimulation

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Related Experiment Videos

Last Updated: Feb 26, 2026

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Postexercise depression (PED) is a temporary reduction in corticomotor excitability following exercise.
  • Understanding the neural mechanisms behind PED is crucial for optimizing motor recovery and performance.

Purpose of the Study:

  • To investigate the cortical circuit mechanisms underlying corticomotor excitability during PED.
  • To examine changes in short-latency afferent inhibition (SAI) and short-interval intracortical inhibition (SICI) during PED.

Main Methods:

  • 16 healthy subjects performed repetitive index finger abduction.
  • Paired-pulse transcranial magnetic stimulation (TMS) was used to measure SAI and SICI before and during PED.
  • Experiments varied TMS parameters to assess different inhibitory circuits.

Main Results:

  • PED was reliably induced, evidenced by decreased motor evoked potential amplitude.
  • SAI significantly decreased (indicating disinhibition) during PED.
  • SICI showed no significant changes during PED.

Conclusions:

  • Cholinergic inhibitory circuit activity is reduced during PED following nonfatiguing repetitive movement.
  • GABAergic circuit activity (GABAA) remains stable during PED.