Eur J Appl Physiol (1992) 65:340-346
Applied Physiology and Occupational Physiology © Spnnger-Verlag1992
Plasma potassium and ventilation during incremental exercise in humans: modulation by sodium bicarbonate and substrate availability M. W. Busse, J. Scholz, and N. Maassen Centre of Physiology, Department of Sports and Exercise Physiology (4251), Medizinische Hochschule Hannover, W-3000 Hannover, Federal Republic of Germany Accepted May 20, 1992
Summary. It has recently been demonstrated that, compared to normal conditions, ventilation (12E) was increased during exercise after glycogen depletion, in spite of a marked increase in plasma pH (pile). It was further demonstrated that 12E in patients with McArdle's syndrome was reduced when substrate availability was improved. In the present experiments, six endurance trained men performed two successive cyclo-ergometric incremental exercise tests (tests A, B) after normal nutrition (N) and after a fatty meal in conjunction with a sodium bicarbonate (NaHCO3) solution (Fsa) or without NaHCO3 (F), and the relationship between 12E, plasma potassium concentration ([K +lP), and pHp was checked. Plasma free fatty acid concentration ([FFA]p) was markedly increased in the F and FsB trials (P
Applied Physiology and Occupational Physiology © Spnnger-Verlag1992
Plasma potassium and ventilation during incremental exercise in humans: modulation by sodium bicarbonate and substrate availability M. W. Busse, J. Scholz, and N. Maassen Centre of Physiology, Department of Sports and Exercise Physiology (4251), Medizinische Hochschule Hannover, W-3000 Hannover, Federal Republic of Germany Accepted May 20, 1992
Summary. It has recently been demonstrated that, compared to normal conditions, ventilation (12E) was increased during exercise after glycogen depletion, in spite of a marked increase in plasma pH (pile). It was further demonstrated that 12E in patients with McArdle's syndrome was reduced when substrate availability was improved. In the present experiments, six endurance trained men performed two successive cyclo-ergometric incremental exercise tests (tests A, B) after normal nutrition (N) and after a fatty meal in conjunction with a sodium bicarbonate (NaHCO3) solution (Fsa) or without NaHCO3 (F), and the relationship between 12E, plasma potassium concentration ([K +lP), and pHp was checked. Plasma free fatty acid concentration ([FFA]p) was markedly increased in the F and FsB trials (P
