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Methylphenidate Enhances Grip Force and Alters Brain Connectivity.

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Methylphenidate (MPH) improved grip force during fatiguing exercise by altering brain connectivity between the insular cortex and motor areas. This suggests MPH influences central nervous system regulation of exercise performance and homeostasis.

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Pharmacology

Background:

  • Central fatigue theories propose the brain limits exercise output to maintain homeostasis.
  • Interoception, the awareness of the body's internal state, involves brain regions like the insular and orbital frontal cortex.
  • Methylphenidate (MPH) may enhance exercise performance by affecting central fatigue mechanisms, but its neural basis is unclear.

Purpose of the Study:

  • To investigate the effect of MPH on force output during a fatiguing handgrip task.
  • To examine how MPH influences brain functional connectivity during muscle fatigue.
  • To explore the neural underpinnings of MPH's ergogenic effects.

Main Methods:

  • A double-blind, crossover study involving 15 participants.
  • Participants performed a fatiguing handgrip task under MPH and placebo conditions during functional magnetic resonance imaging (fMRI).
  • Force output and brain connectivity (functional connectivity and psychophysiological interactions) were measured.

Main Results:

  • MPH increased grip force output throughout the fatiguing task, but not immediately before task failure.
  • Significant alterations in brain connectivity were observed between the insular cortex and hand motor cortex, and between the insular and orbital frontal cortex during the task.
  • No differences in brain connectivity were found in the pretask failure period.

Conclusions:

  • MPH influences brain functional connectivity during muscle-fatiguing exercise.
  • These findings support the role of the central nervous system in regulating motor drive during exercise, subservient to homeostasis.
  • This study provides novel insights into the neurobiological mechanisms of MPH's ergogenic effects.