Abstract
Plasma citrate was determined in seven subjects working 45 min at 50-60% of their maximal aerobic power and in six subjects who were exercised intermittently for five periods of 1 min at supramaximal work loads. Determinations of plasma lactate, glucose, free fatty acids and insulin were carried out simultaneously. During submaximal work the mean plasma citrate concentration decreased from 116 ±4 μmol/l at rest to 108±5 μmol/l after 10 min exercise (PPPin vitro knowledge of the regulatory role of citrate on glucose oxidation.