Journal of Applied Physiology
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J Appl Physiol 80: 133-139, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology, Vol 80, Issue 1 133-139, Copyright © 1996 by American Physiological Society

ARTICLES

Reproducibility of 24-h energy expenditure and macronutrient oxidation rates in an indirect calorimeter

M. D. White, G. Bouchard, B. Buemann, N. Almeras, J. P. Despres, C. Bouchard and A. Tremblay
Physical Activity Sciences Laboratory, Laval University, Ste-Foy, Canada.

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.


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