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Time to Reach Steady State Resting Energy Expenditure in Healthy Adults Using Indirect Calorimetry
Author(s) -
Popp Collin,
Tisch Jocelyn,
Bridges William,
Traylor Dan,
Najm Nadia,
Jesch Elliot
Publication year - 2015
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.29.1_supplement.632.4
Subject(s) - respiratory quotient , resting energy expenditure , calorimetry , zoology , supine position , basal metabolic rate , energy expenditure , steady state (chemistry) , medicine , calorie , mathematics , chemistry , biology , physics , thermodynamics
Background Resting energy expenditure (REE) measures the amount of calories needed for the body to maintain basic function over a 24‐hour period. Traditionally, REE protocols through indirect calorimetry take 45 minutes to complete. Generally, the first 10 to 20 minutes of data collected are excluded to allow the participants to reach steady state. Objective The purpose of this study was to determine a more precise time to reach a resting steady state. Methods Fifty healthy, adult male and female participants volunteered for this study. Each participant completed indirect calorimetry after a 12‐hour overnight fast. Participants were instructed to lay supine and awake under a plastic canopy for approximately 30‐minute, while oxygen consumption (VO 2 ) and carbon dioxide production (VCO 2 ) measures were collected. These values were used to determine steady state REE (kcals•day ‐1 ) and respiratory quotient (RQ). Statistical analysis for the response of variables to time was modeled with a logistics decay function. Data are reported as mean ± SD with an alpha level of 0.05. Results Predicted time to steady state REE in kcals•day ‐1 and in kcals•day ‐1 •kg ‐1 was reached at 15.09 ± 0.1 minutes and 15.10 ± 0.1 minutes, respectively. There was no significant change in REE thereafter. In addition, respiratory quotient values from the first 15‐minutes (0.91) to the last 15‐minutes (0.86) were significantly different (p < 0.001). Conclusion Indirect calorimetry to measure steady state resting energy expenditure should exclude the first 15‐minutes in a young, healthy population.