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MEASURED AND PREDICTED RESTING ENERGY EXPENDITURE IN OVERWEIGHT BLACK AND WHITE YOUNG ADULT WOMEN

Abstract

Daishan Johnson, Ronald Evans, FACSM, Autumn Lanoye, Jessica LaRose. Virginia Commonwealth University, Richmond, VA.

BACKGROUND: Resting energy expenditure (REE) is the major determinant of total energy expenditure and is reported to be reduced in Black compared to White individuals. This study aims to assess and evaluate the relationship between REE and body composition (BC) measures in overweight Black and White young adult women and explore the accuracy of common REE prediction equations. METHODS: Weight (WT), height (HT), measured REE (REEM; Fitmate GS, Cosmed USA Inc.), and BC (BC-418, Tanita Corp.) were assessed in Black (n=79) and White (n=96) non-hispanic women (age=22.2 ± 2.1; BMI≥25 kg/m2) enrolling in a behavioral weight loss (BWL) program. In addition to REEM, the accuracy of 4 common REE prediction (REEP) equations was evaluated: Harris-Benedict, Mifflin-St. Jeur, Owen, and World Health Organization. RESULTS: Black women had significantly (p<0.05) higher WT, BMI, and % fat and significant correlations were observed between REEM and all BC variables in both groups. No significant differences were observed in unadjusted REEM (1534±240 vs. 1525±274 kcals/day; p=0.82); however, REEM adjusted for WT was significantly lower in Black women (1492±201 vs. 1561±201 kcals/day; p=0.028). The Owen equation demonstrated the highest accuracy in both groups with ~63% of REEP values within ±10% of REEM. CONCLUSIONS: The observed difference in weight adjusted REEM between the groups has implications for caloric intake and physical activity goal setting in BWL. Further research is needed to determine if the observed difference in REEM impacts weight loss outcomes and weight loss maintenance. This work was supported by NIH R01DK103668 to JGL.

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