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- Title
Resting energy expenditure in 18-20 year old males and females: Validation of indirect calorimetry and Harris-Benedict prediction equation.
- Authors
Riddell, L. J.; Dardarian, N.; McKinney, S.
- Abstract
Background -- The accurate measurement of Resting Energy Expenditure (REE) is a cornerstone of nutritional assessment. The purpose of this study was to compare two indirect calorimetry methods for measuring REE and the REE estimation obtained by using the Harris-Benedict prediction equation (HBE). The indirect calorimetry methods used were the well validated but expensive metabolic cart, Vmax Spectra (SensorMedics, Yorba Linda, CA) and a commercially available and inexpensive hand-held indirect calorimeter, MedGem (HealtheTech Inc. Golden, CO). Objective -- To compare REE measurements obtained from the Vmax Spectra and the MedGem and estimations of REE calculated using the Harris-Benedict Equation. Design -- A convenience sample of seventy six adults (45 women, 31 men)(mean ± SD), age 19.3 ± 0.1 years, body mass index 22 ± 0.27(kg/m²) completed duplicate REE measurements using both the MedGem and Vmax Spectra. Subjects were instructed to avoid food and beverage (excluding water), vigorous physical activity and medications for 12 hours prior to measurements. All Vmax measurements were collected in a reclining position following a 30 minute rest period; MedGem measurements were collected in a seated position according to manufacturers' instructions. Outcomes -- Paired t-test results between REE measured using the MedGem hand-held indirect calorimeter showed no significant difference (P > 0.05) from the REE measurement using Vmax Spectra metabolic cart. Pearson's correlations were significant between HBE and the two methods of REE measurement (P <0.01). Paired t-test values were significant between the Vmax Spectra results and the HBE prediction equation (P >0.05). The HBE prediction results were statistically similar to REE measured using the MedGem (P >0.05). Compared to the Vmax Spectra results accuracy is lower (38% within ± 5% range) than predicted REE using the HBE (88%). Conclusions -- At the group level there is agreement between measured REE using the Vmax Spectra metabolic cart and the MedGem hand-held indirect calorimeter. However, for an individual clinically significant difference in resting energy expenditure would be obtained by the three different methods. Awareness of the limitations of the HBE and portable hand-held indirect calorimeter is invaluable and will help clinicians choose the best method for determining resting energy expenditure for the sampled population. More studies are needed on different groups living under different environmental, economical, and social conditions.
- Publication
Asia Pacific Journal of Clinical Nutrition, 2005, Vol 14, pS47
- ISSN
0964-7058
- Publication type
Academic Journal