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KILBURN, KAYE H. Muscular origin of elevated plasma potassium during exercise. J. Appl. Physiol. 2 I (2) : 675-678. Ig66.-In healthy subjects plasma potassium (K) concentrations increased from resting levels of 3.8 mEq/liter to 5 mEq/liter during treadmill walking with average 02 consumptions of 2 liters/min. Whole blood K levels increased similarly as arterial increased 5.9 nmoles/ blood hydrogen (H) ion concentration liter and bicarbonate levels decreased I .6 mEq/liter. Similar changes occurred in ambulatory patients walking to produce O2 consumptions of 1,200 ml/min. Plasma draining from the exercising forearms of similar subjects contained 0.7 mEq/liter more K than did arterial plasma. Whole blood K concentration CO2 tension, H ion and bicarbonate levels were elevated in such venous blood but arterial blood levels were unchanged. It is postulated that exercise produced acidosis in muscle cells, that some K was exchanged for H ions, and both were released from striated muscle. This is most consistent with the increased H ion concentration of arterial blood during moderate systemic exercise and in blood draining from the exercising forearm. However, in view of the small fraction of change in muscle K required to produce a large increase in extracellular K, other mechanisms
Journal of Applied Physiology – The American Physiological Society
Published: Mar 1, 1966
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