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Ventilation parallels plasma potassium during incremental and continuous variable intensity exercise

B B Yaspelkis1, P A Anderla, J G Patterson

  • 1Department of Kinesiology, University of Texas at Austin 78712.

International Journal of Sports Medicine
|November 1, 1994
PubMed
Summary
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Plasma potassium (K+) and ventilation (VE) are linked during exercise. While K+ influences breathing, it

Area of Science:

  • Exercise Physiology
  • Cardiorespiratory Regulation
  • Human Performance

Background:

  • Ventilatory control during exercise is complex.
  • Plasma potassium (K+) is implicated in exercise-induced hyperpnea.
  • The precise relationship between plasma K+ and ventilation (VE) across varying exercise intensities requires further elucidation.

Purpose of the Study:

  • To investigate the relationship between plasma potassium (K+) and ventilation (VE) during both incremental and prolonged continuous exercise.
  • To determine if plasma K+ is the sole determinant of ventilatory responses during exercise.
  • To analyze how exercise intensity affects the VE/K+ ratio.

Main Methods:

  • Seven well-trained male cyclists performed graded incremental exercise to 90% VO2max.

Related Experiment Videos

  • Subjects also completed prolonged continuous exercise with varying low (45% VO2max) and moderate (75% VO2max) intensity intervals.
  • Plasma K+ concentration and ventilation (VE) were measured throughout exercise protocols.

    • Main Results:

    • During prolonged exercise, VE and plasma K+ showed coordinated changes, with greater responses at moderate intensity.
    • A strong positive relationship was observed between VE and plasma K+ during incremental exercise.
    • The VE/K+ ratio increased with exercise intensity, indicating VE rose more steeply than plasma K+.

    Conclusions:

    • Plasma potassium concentration contributes to ventilatory regulation during exercise.
    • Plasma K+ may not be the sole factor driving ventilation, especially at higher intensities.
    • The ventilatory response becomes disproportionately greater than the plasma K+ increase as exercise intensity rises.