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Relationship between plasma potassium and ventilation during successive periods of exercise in men

, : Relationship between plasma potassium and ventilation during successive periods of exercise in men. European Journal of Applied Physiology & Occupational Physiology 64(1): 22-25

During and after two successive incremental cycle ergometer tests (tests A and B), plasma potassium concentration ([K+]p), plasma pH (pHp), plasma partial pressure of carbon dioxide, blood lactate concentration ([Lac-]b) and ventilation (.ovrhdot.VE) were measured. While there was a good correlation between the increase in [K+]p and .ovrhdot.VE or pHp, respectively, in test A, in test B a close correlation was found only between the increase in .ovrhdot.VE and [K+]p (r > 0.9 for nearly all single cases; r was 0.84 and 0.89 for all (pooled) cases in tests A and B, respectively; the correlation coefficients between changes in pHp and .ovrhdot.VE in tests A and B were r = 0.74 and r = 0.28, respectively, and r = 0.89 and r = 0.10 between the changes in [Lac-]b and .ovrhdot.VE in tests A and B). The close relationship for individuals between .ovrhdot.VE and [K+]p in tests A and B supported the hypothesis that the extracellular increase in [K+] may contribute to the ventilatory drive during exercise. The comparison of the results of tests A and B further indicated that the relationship between pHp and .ovrhdot.VE was dependent on the experimental design, and that pHp and .ovrhdot.VE changes are unlikely to be cause and effect.

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Accession: 002477930

PMID: 1735406

DOI: 10.1007/bf00376434

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