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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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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35 citations in Web of Science®
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ID Code: 8860
Item Type: Journal Article
Refereed: Yes
Additional Information: Articles free to read on journal website after 12 months
Additional URLs:
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 00:00
Last Modified: 03 Feb 2015 03:09

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