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Exercise starts and ends in the brain.

Bengt Kayser1

  • 1Faculty of Medicine, University of Geneva, Switzerland. bengt.kayser@medecine.unige.ch

European Journal of Applied Physiology
|July 29, 2003
PubMed
Summary
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The brain, not just muscles or heart, limits exercise endurance. The central nervous system (CNS) controls exercise duration by integrating signals and preventing excessive exertion to protect the body.

Area of Science:

  • Exercise Physiology
  • Neuroscience

Background:

  • Traditional models attribute exercise endurance limits to metabolic factors like VO2max and muscle fatigue.
  • These models fail to explain exhaustion during high-altitude exercise with non-fatigued muscles and sub-maximal cardiac output.

Purpose of the Study:

  • To propose an alternative model for exercise endurance limitation.
  • To highlight the role of the central nervous system (CNS) in regulating exercise intensity and duration.

Main Methods:

  • Conceptual review and model proposal.
  • Integration of existing physiological and neurological concepts.

Main Results:

  • Exercise initiation and cessation are volitional acts originating in the brain.

Related Experiment Videos

  • The CNS integrates sensory inputs during exercise.
  • The CNS may limit motor unit recruitment to prevent organismal harm.

    • Conclusions:

    • The CNS plays a pivotal role in determining exercise endurance limits.
    • An alternative model posits CNS control over skeletal muscle recruitment based on integrated sensory information.
    • This CNS-centric model complements traditional metabolic explanations.