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Plasma potassium changes with high intensity exercise.

J I Medbø1, O M Sejersted

  • 1Department of Physiology, National Institute of Occupational Health, Oslo, Norway.

The Journal of Physiology
|February 1, 1990
PubMed
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Exercise significantly alters plasma potassium levels, rising during exertion and falling below resting levels post-exercise. This rapid change is driven by muscle activity and efficient potassium reuptake mechanisms.

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Muscle Metabolism

Background:

  • Extracellular potassium concentration typically remains within narrow limits.
  • Exercise is known to induce significant, yet poorly understood, shifts in plasma potassium.

Purpose of the Study:

  • To investigate the dynamic changes in plasma potassium concentration during and after exhausting exercise.
  • To elucidate the relationship between exercise intensity and plasma potassium fluctuations.
  • To model the mechanisms of potassium efflux from exercising muscles and subsequent elimination from blood.

Main Methods:

  • Twenty healthy, well-trained men performed 1-minute exhausting treadmill exercise at a 6-degree inclination.
  • Blood samples were collected via femoral artery and vein catheters to measure plasma potassium.

Related Experiment Videos

  • Exercise intensity was varied to assess its impact on potassium levels; mathematical modeling was employed.

    • Main Results:

    • Plasma potassium concentration rose significantly during exercise, peaking at over 8.3 mmol/l, in parallel in arterial and venous blood.
    • Post-exercise, potassium levels dropped below baseline by 0.5 mmol/l within 3 minutes, following exponential time courses.
    • Peak potassium levels correlated linearly with exercise intensity; resting, peak, and nadir values showed proportional relationships.

    Conclusions:

    • Increased plasma potassium during exercise is primarily attributed to electrical activity and efflux from exercising muscles.
    • Potassium elimination from blood is likely mediated by a proportional regulator, possibly the Na(+)-K+ pump, with uptake rate proportional to extracellular accumulation.
    • The rapid potassium dynamics are governed by first-order kinetics of the reuptake mechanism, not a limited uptake capacity.