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1 Center for Human Nutrition, Washington University School of Medicine, St. Louis,, Missouri, United States; Department of Nutrition and Dietetics, Harokopio University, Athens, Greece
2 Center for Human Nutrition, Washington University School of Medicine, St. Louis,, Missouri, United States
* To whom correspondence should be addressed. E-mail: mittendb{at}im.wustl.edu.
We have recently demonstrated that a single, prolonged bout of moderate-intensity cycling (2 h at 60% of peak oxygen consumption, VO2 peak) in the evening increases basal whole-body free fatty acid (FFA) flux and fat oxidation, decreases hepatic VLDL-apolipoprotein B-100 (apoB-100) secretion, and enhances removal efficiency of VLDL-triglyceride (TG) from the circulation the following day in untrained, healthy, lean men. In the present study, we investigated the effect of a single, shorter duration bout of the same exercise (1 h cycling at 60% of VO2 peak) on basal FFA, VLDL-TG and VLDL-apoB-100 kinetics in seven untrained, healthy, lean men by using stable isotope labeled tracer techniques. Basal plasma FFA rate of appearance in plasma and plasma FFA concentration were ~55% greater (P < 0.05) the morning after exercise than rest, whereas resting metabolic rate and whole-body substrate oxidation rates were not different after rest and exercise. Exercise had no effect on plasma VLDL-TG and VLDL-apoB-100 concentrations, hepatic VLDL-TG and VLDL-apoB-100 secretion rates, and VLDL-TG and VLDL-apoB-100 plasma clearance rates (all P > 0.05). We conclude that in untrained, healthy, lean men: 1) the exercise-induced changes in basal whole-body fat oxidation, VLDL-TG and VLDL-apoB-100 metabolism during the late phase of recovery from exercise are related to the duration of the exercise bout; 2) single sessions of typical recreational activities appear to have little effect on basal, fasting plasma TG homeostasis; and 3) there is a dissociation between systemic FFA availability and VLDL-TG and VLDL-apoB-100 secretion by the liver.
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