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Potassium and ventilation in exercise.

D J Paterson1

  • 1University Laboratory of Physiology, University of Oxford, United Kingdom.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1992
PubMed
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Potassium accumulation in the blood during exercise may stimulate breathing. This review suggests potassium, a byproduct of muscle work, acts as a key signal driving increased ventilation (VE) during physical activity.

Area of Science:

  • Exercise Physiology
  • Respiratory Control
  • Neuroendocrinology

Background:

  • The neural and humoral control of breathing during exercise is complex and debated.
  • Identifying the precise signals that increase ventilation (VE) during physical activity is crucial for understanding respiratory regulation.

Purpose of the Study:

  • To review evidence supporting potassium as a primary stimulus for ventilation during exercise.
  • To explore the physiological mechanisms by which potassium influences respiratory drive.

Main Methods:

  • Review of existing literature on potassium levels, ventilation, and chemoreceptor function during exercise.
  • Analysis of studies involving animal models (anesthetized cats) with manipulated chemoreceptor sensitivity.
  • Correlation analysis between plasma potassium, carbon dioxide production, and VE in human subjects.

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Main Results:

  • Plasma potassium increases proportionally with carbon dioxide production during exercise and correlates with VE.
  • Hyperkalemia stimulates VE in animal models via peripheral arterial chemoreceptors, a response abolished by denervation.
  • Hypoxia potentiates the effect of hyperkalemia on chemoreceptors, while hyperoxia negates it.

Conclusions:

  • Potassium accumulation (hyperkalemia) is a strong candidate for the 'work factor' stimulating exercise hyperpnea.
  • Evidence suggests potassium acts as a humoral signal, primarily through peripheral chemoreceptor excitation.
  • While direct proof is lacking, circumstantial evidence strongly implicates potassium in driving exercise-induced ventilation.