title: Reproducibility of 24-h energy expenditure and macronutrient oxidation rates in an indirect calorimeter.
abstract: The maintenance of weight and adipose tissue mass in humans appears to be related to a balance between the rates of oxidation and consumption of macronutrients; yet, little evidence is available on the reproducibility of 24-h macronutrient oxidation rates and how this relates to diet in the days preceding a chamber session. This study examined the reproducibility of 24-h macronutrient oxidation rates, 24-h energy expenditure (EE), and respiratory quotient (RQ) in 30 adults who ate their habitual diets before two 24-h whole body indirect calorimeter sessions. Results showed that the within-subject coefficients of variation (CVws) for 24-h EE and RQ were 2.8 and 2.6%, respectively. CVws for macronutrient oxidations ranged from approximately 15 to 25%. Means comparisons of 24-h EE, RQ, and macronutrient oxidation rates between sessions showed no significant differences, and all variables had significant positive intraclass correlation coefficients (P < 0.05). In conclusion, macronutrient oxidations all showed significant reproducibility for the group and a significant but lower reproducibility for individuals when habitual diet and activity preceded the experimental sessions.
authors.affiliation: Physical Activity Sciences Laboratory, Laval University, Ste-Foy, Canada.
authors.forename: M D
authors.initials: MD
authors.lastname: White
authors.forename: G
authors.initials: G
authors.lastname: Bouchard
authors.forename: B
authors.initials: B
authors.lastname: Buemann
authors.forename: N
authors.initials: N
authors.lastname: Alméras
authors.forename: J P
authors.initials: JP
authors.lastname: Després
authors.forename: C
authors.initials: C
authors.lastname: Bouchard
authors.forename: A
authors.initials: A
authors.lastname: Tremblay
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000328:Adult; D000368:Aged; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D002153:Calorimetry, Indirect; D002245:Carbon Dioxide / Q000494:pharmacology; D004032:Diet; D004040:Dietary Carbohydrates / Q000378:metabolism*; D004041:Dietary Fats / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004435:Eating; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D015656:Respiratory Mechanics / Q000502:physiology
chemical_list: D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D002245:Carbon Dioxide