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Reducing the time period of steady state does not affect the accuracy of energy expenditure measurements by indirect calorimetry

Reeves, Marina M., Davies, Peter S., Bauer, Judith D., & Battistutta, Diana (2004) Reducing the time period of steady state does not affect the accuracy of energy expenditure measurements by indirect calorimetry. Journal of Applied Physiology, 97(1), pp. 130-134.

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Abstract

Achievement of steady state during indirect calorimetry measurements of resting energy expenditure (REE) is necessary to reduce error and ensure accuracy in the measurement. Steady state is often defined as 5 consecutive min (5-min SS) during which oxygen consumption and carbon dioxide production vary by ±10%. These criteria, however, are stringent and often difficult to satisfy. This study aimed to assess whether reducing the time period for steady state (4-min SS or 3-min SS) produced measurements of REE that were significantly different from 5-min SS. REE was measured with the use of open-circuit indirect calorimetry in 39 subjects, of whom only 21 (54%) met the 5-min SS criteria. In these 21 subjects, median biases in REE between 5-min SS and 4-min SS and between 5-min SS and 3-min SS were 0.1 and 0.01%, respectively. For individuals, 4-min SS measured REE within a clinically acceptable range of ±2% of 5-min SS, whereas 3-min SS measured REE within a range of –2–3% of 5-min SS. Harris-Benedict prediction equations estimated REE for individuals within ±20–30% of 5-min SS. Reducing the time period of steady state to 4 min produced measurements of REE for individuals that were within clinically acceptable, predetermined limits. The limits of agreement for 3-min SS fell outside the predefined limits of ±2%; however, both 4-min SS and 3-min SS criteria greatly increased the proportion of subjects who satisfied steady state within smaller limits than would be achieved if relying on prediction equations.

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21 citations in Web of Science®

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ID Code: 8860
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal’s website (see hypertext link) or contact the author. d.battistutta@qut.edu.au
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Keywords: resting energy expenditure, metabolism
DOI: 10.1152/japplphysiol.01212.2003
ISSN: 0021-8987
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700)
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2004 American Physiological Society
Deposited On: 02 Aug 2007
Last Modified: 29 Feb 2012 23:06

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