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Effect of Acclimation on Resting Energy Expenditure Measurements
Author(s) -
Kobar Shirley,
Francis Coni C.,
MaWhinney Samantha,
Sharp Teresa
Publication year - 2003
Publication title -
nutrition in clinical practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 71
eISSN - 1941-2452
pISSN - 0884-5336
DOI - 10.1177/0115426503018005417
Subject(s) - medicine , resting energy expenditure , acclimatization , morning , zoology , energy expenditure , basal metabolic rate , supine position , limits of agreement , nuclear medicine , biology , botany
Background: Development of an acclimation protocol for use when measuring resting energy expenditure (REE) would simplify and standardize data collection. The purpose of this study was to determine if our 2 metabolic carts could be used interchangeably and to determine if excluding the first 3 or 5 minutes of data collected as an acclimation period would significantly improve the coefficients of variation (CVs) for oxygen consumed (VO 2 ) and carbon dioxide produced (VCO 2 ) when performing REE assessments with our metabolic cart systems. Methods: Thirteen healthy, nonsmoking adults ranging in age from 32 to 45 years, with activity levels ranging from sedentary to highly active, participated. Indirect calorimetry was performed twice in the morning after 30 minutes of supine resting. Subjects had fasted for 12 hours, and did not exercise within the last 24 hours. The system order for testing was randomized for the first measurement. When the first measurement was completed, subjects were crossed over for measurement using a second metabolic cart. Results: The CVs for VO 2 and VCO 2 were significantly lower when excluding the first 3 (VO 2 , p = .0005), (VCO 2 , p = .0024) or 5 minutes (VO 2 , p = .0001, VCO 2 , p = .0021) of data compared with no exclusions. No significant differences in CVs between the 3‐ and 5‐minute exclusions were found for VO 2 ( p = .3224) or VCO 2 ( p = .2255). Conclusions: Clearly, our machines cannot be used interchangeably within a study. An acclimation period improves CVs of VO 2 and VCO 2. The similarities in CVs led us to adopt a 3‐minute acclimation period for measuring REE.