Reproducibility of 24-h energy expenditure and macronutrient
oxidation rates in a whole body indirect calorimeter.
White, M. D., G. Bouchard, B. Buemann, N. Alm[acute]eras, J-P
Despr[acute]es, C. Bouchard, and A. Tremblay.
Physical Activity Sciences Laboratory and Lipid Research Center,
Laval University, Ste-Foy, Qu[acute]ebec, Canada, G1K 7P4, Telephone
418 656 7294, FAX 418 656 3020
APStracts 2:0385A, 1995.
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 EE and RQ in 30 adults who ate their habitual diets prior to two
24-h whole body indirect calorimeter sessions. Results showed that
the within-subject coefficients of variation (CVws) for 24-h EE and
respiratory quotient (RQ) were 2.8 and 2.6%, respectively. CVws for
macronutrient oxidations ranged from about 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.
Received 3 May 1995; accepted in final form 29 August 1995.
APS Manuscript Number A469-5.
Article publication pending Journal of Applied Physiology.
ISSN 1080-4757 Copyright 1995 The American Physiological Society.
Published in APStracts on 23 September 1995.