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Related Experiment Videos

Interrelationship between pH, plasma potassium concentration and ventilation during intense continuous exercise in

M W Busse1, N Maassen, H Konrad

  • 1Department of Sport and Exercise Physiology, Medical School, Hannover, West Germany.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1989
PubMed
Summary

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Plasma potassium concentration ([K+]P) increases with exercise intensity and may control ventilation (VE), influencing plasma hydrogen ion concentration ([H+]P). This study investigated these relationships during intense exercise in trained men.

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Biochemistry

Background:

  • Plasma hydrogen ion concentration ([H+]P) influences ventilation (VE) at rest.
  • Control of plasma potassium concentration ([K+]P) and its relationship with VE during exercise are not well understood.

Purpose of the Study:

  • To investigate the relationship between [H+]P, [K+]P, and VE during intense exercise.
  • To determine if [K+]P is an indicator of muscular stress during exercise.

Main Methods:

  • Eight trained men performed two intense, continuous cycle-ergometer tests.
  • Test I was conducted during metabolic acidosis, and Test II during alkalotic pH.

Main Results:

  • No correlation was found between [H+]P and [K+]P or VE during exercise.

Related Experiment Videos

  • [K+]P and VE showed a correlation with exercise intensity.
  • Relative changes in [K+]P and VE were highly correlated (r=0.9), suggesting extracellular potassium controls VE.

    • Conclusions:

    • Plasma potassium concentration ([K+]P) is a reliable indicator of muscular stress during exercise.
    • Extracellular potassium likely controls ventilation (VE), which in turn influences plasma hydrogen ion concentration ([H+]P).