Journal
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM
Volume 38, Issue 8, Pages 823-829Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/apnm-2012-0468
Keywords
physical activity; hypotriglyceridemia; triacylglycerol; kinetics; aerobic; lean
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Funding
- Graduate Program, Department of Nutrition and Dietetics of Harokopio University
- Hellenic Heart Foundation
- Greek Governmental Institute of Scholarships
- Institute for Translational Sciences at the University of Texas Medical Branch
- Clinical and Translational Science Award from the National Center for Advancing Translational Sciences, National Institutes of Health [UL1TR000071]
- Shriners Hospital for Children [SSF 84090]
- Sealy Center on Aging, University of Texas Medical Branch at Galveston
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A single bout of high-intensity interval aerobic exercise has been shown to produce the same or greater metabolic benefits as continuous endurance exercise with considerably less energy expenditure, but whether this applies to very low density lipoprotein (VLDL) metabolism is not known. We sought to examine the effect of a single bout of high-intensity interval aerobic exercise on basal VLDL-triglyceride (TG) kinetics 14 and 48 h after exercise cessation to determine the acute and time-dependent effects of this type of exercise on VLDL-TG metabolism. Eight healthy sedentary men (age, 23.6 +/- 6.1 years; body mass index, 23.1 +/- 2.2 kg . m(-2), peak oxygen consumption ((V) over dot O-2peak), 36.3 +/- 5.5 mL . kg(-1) . min(-1)) participated in three stable isotopically labeled tracer infusion studies: (i) 14 h and (ii) 48 h after a single bout of high-intensity aerobic interval exercise (60% and 90% of (V) over dot O-2peak in 4 min intervals for a total of 32 min; gross energy expenditure similar to 500 kcal) and (iii) after an equivalent period of rest, in random order. Fasting plasma VLDL-TG concentration was 20% lower at 14 h (P = 0.046) but not at 48 h (P = 1.000) after exercise compared with the resting trial. VLDL-TG plasma clearance rate increased by 21% at 14 h (P < 0.001) but not at 48 h (P = 0.299) after exercise compared with rest, whereas hepatic VLDL-TG secretion rate was not different from rest at any time point after exercise. We conclude that high-intensity interval exercise reduces fasting plasma VLDL-TG concentrations in non-obese men the next day by augmenting VLDL-TG clearance, just like a single bout of continuous endurance exercise. This effect is short-lived and abolished by 48 h after exercise.
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