Response of Acetone in Expired Air During Graded and Prolonged Exercise

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Ketone bodies consisting of acetoacetate, 3-hydroxybutirate and acetone are synthesized from fatty acids in the liver and released into the circulation. A portion of acetone from the circulation is then expired into the air. The purpose of this study was to determine the response of acetone in expired air during graded and prolonged exercises and the relationship between acetone and other respiratory parameters. Twelve female college students carried out graded and prolonged exercises during which expired gas was collected and acetone, oxygen intake and carbon dioxide excretion were analyzed. In the graded exercises, the acetone began to increase at approximately 35% Vo_<2max>, which followed the maximal fat oxidation rate at approximately 40% Vo_<2max> and pulmonary ventilatory threshold (VT) at 46% Vo_<2max>. Significant correlations were found between intensity of the acetone threshold and those of the maximal fat oxidation rate (r=0.667, p<0.05) and the VT (r=0.871, p<0.001). In prolonged exercise, the acetone and the fat oxidation rate increased gradually and a logarithmically significant correlation was found (r=0.883, p<0.001). Therefore, the acetone in expired air increases from a relatively lower intensity during graded exercise and does so gradually during prolonged exercise. These results suggest that the expired acetone level correlates with maximal fat oxidation rate and ventilatory threshold during graded exercise. The acetone level similarly correlates with the fat oxidation rate during prolonged exercise.

Response of Acetone in Expired Air During Graded and Prolonged Exercise

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