title: Interaction between dietary fat and exercise on excess postexercise oxygen consumption.
abstract: The objective of this study was to determine the effect of increased physical activity on subsequent sleeping energy expenditure (SEE) measured in a whole room calorimeter under differing levels of dietary fat. We hypothesized that increased physical activity would increase SEE. Six healthy young men participated in a randomized, single-blind, crossover study. Subjects repeated an 8-day protocol under four conditions separated by at least 7 days. During each condition, subjects consumed an isoenergetic diet consisting of 37% fat, 15% protein, and 48% carbohydrate for the first 4 days, and for the following 4 days SEE and energy balance were measured in a respiration chamber. The first chamber day served as a baseline measurement, and for the remaining 3 days diet and activity were randomly assigned as high-fat/exercise, high-fat/sedentary, low-fat/exercise, or low-fat/sedentary. Energy balance was not different between conditions. When the dietary fat was increased to 50%, SEE increased by 7.4% during exercise (P < 0.05) relative to being sedentary (baseline day), but SEE did not increase with exercise when fat was lowered to 20%. SEE did not change when dietary fat was manipulated under sedentary conditions. Physical activity causes an increase in SEE when dietary fat is high (50%) but not when dietary fat is low (20%). Dietary fat content influences the impact of postexercise-induced increases in SEE. This finding may help explain the conflicting data regarding the effect of exercise on energy expenditure.
authors.affiliation: Pennington Biomedical Research Center, Baton Rouge, Louisiana;
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Frost
authors.forename: Leanne M
authors.initials: LM
authors.lastname: Redman
authors.forename: Lilian
authors.initials: L
authors.lastname: de Jonge
authors.forename: Jennifer
authors.initials: J
authors.lastname: Rood
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Zachwieja
authors.forename: Julia
authors.initials: J
authors.lastname: Volaufova
authors.forename: George A
authors.initials: GA
authors.lastname: Bray
authors.forename: Steven R
authors.initials: SR
authors.lastname: Smith
mesh_terms: D000328:Adult; D018592:Cross-Over Studies; D059305:Diet, High-Fat; D004041:Dietary Fats / Q000008:administration & dosage*; D002149:Energy Intake / Q000502:physiology; D004734:Energy Metabolism / Q000187:drug effects; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D012119:Respiration; D012146:Rest / Q000502:physiology; D016037:Single-Blind Method; D055815:Young Adult
chemical_list: D004041:Dietary Fats
keywords: dietary fat; physical activity; sleeping energy expenditure