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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Pharmacology

Background:

  • Muscle fatigue is a homeostatic disturbance with lasting brain effects, including reduced interhemispheric functional connectivity (FC).
  • Stimulants like methylphenidate (MPH) can be ergogenic, enhancing performance during fatiguing exercise.
  • Previous research showed MPH increased force and FC during a fatiguing task, but post-exercise resting FC effects were unknown.

Purpose of the Study:

  • To investigate the effects of methylphenidate (MPH) on resting-state functional connectivity (FC) in the recovery period after a fatiguing handgrip task.
  • To examine how MPH impacts FC between interhemispheric motor cortices (M1) and between the insular cortex (IC) and motor areas post-exercise.

Main Methods:

  • Double-blind, counter-balanced design using magnetic resonance imaging (MRI).
  • Participants performed a fatiguing handgrip task after ingesting either placebo or MPH.
  • Resting-state FC was measured before and after the task, focusing on M1 and IC-motor cortex connections.

Main Results:

  • A post-task reduction in M1 interhemispheric FC was observed, negatively correlated with MPH-enhanced force output.
  • Methylphenidate (MPH) significantly increased post-task FC between the right insular cortex (IC) and the left hand motor area, an effect not seen with placebo.
  • These findings indicate lasting neurobiological effects of MPH during fatiguing exercise.

Conclusions:

  • Methylphenidate (MPH) use during muscle fatigue alters subsequent resting-state brain functional connectivity (FC) differently than drug-naïve conditions.
  • MPH demonstrates lasting ergogenic effects on brain networks involved in motor control and interoception post-exercise.
  • The study highlights the neurophysiological impact of stimulant use on brain recovery following physical exertion.