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Related Experiment Videos

Exercise-induced changes in plasma potassium and the ventilatory threshold in man

P McLoughlin1, P Popham, R A Linton

  • 1Laboratory of Applied Physiology, United Medical and Dental School, St Thomas's Hospital, London.

The Journal of Physiology
|August 15, 1994
PubMed
Summary

Changes in arterial potassium (Ka+) do not appear to cause the ventilatory threshold during exercise. Further research is needed to understand the role of peripheral chemoreceptors in this physiological response.

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Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Biochemistry

Background:

  • The ventilatory threshold during incremental exercise is often linked to changes in ventilation (VE) and arterial potassium (Ka+).
  • It has been hypothesized that alterations in Ka+ may influence peripheral chemoreceptors, triggering the ventilatory threshold phenomenon.

Purpose of the Study:

  • To investigate whether the observed pattern of change in arterial potassium (Ka+) can account for the ventilatory threshold during incremental exercise.
  • To examine the relationship between Ka+ and ventilatory threshold under both normal and lactic acidosis conditions.

Main Methods:

  • Six healthy males performed incremental exercise tests under control and lactic acidosis conditions.
  • Measurements included expiratory ventilation (VE), oxygen consumption (VO2), carbon dioxide production (VCO2), arterialized venous PCO2 (PavCO2), pH (pHav), potassium (Kav+), and lactate.

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Main Results:

  • A ventilatory threshold was identified in both control and experimental trials, associated with isocapnic buffering.
  • In control trials, Kav+ showed an inflection point near the ventilatory threshold.
  • During lactic acidosis, Kav+ increased linearly with VO2, and Kav+ concentrations were similar at the ventilatory threshold in both conditions.

Conclusions:

  • The pattern of arterial potassium (Ka+) change does not appear to be the sole factor responsible for the ventilatory threshold.
  • The non-linear response of peripheral chemoreceptors at critical Ka+ levels warrants further investigation.