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Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss.
Am J Clin Nutr 2000; 71(5):1138-46AJ

Abstract

BACKGROUND

The prevalence of obesity is higher in black than in white women. Differences in energy economy and physical activity may contribute to this difference.

OBJECTIVE

The objective of this study was to compare free-living energy expenditure and physical activity in black and white women before and after weight loss.

DESIGN

Participants were 18 white and 14 black women with body mass indexes (in kg/m(2)) between 27 and 30. Diet, without exercise, was used to achieve a weight loss of >/=10 kg and a body mass index <25. After 4 wk of energy balance in overweight and normal-weight states, body composition was assessed by using a 4-compartment model, sleeping and resting energy expenditures were assessed by using a chamber calorimeter, physiologic stress of exercise and exercise economy were measured by using standardized exercise tasks, and daily energy expenditure was assessed by using doubly labeled water.

RESULTS

Weight loss averaged 12.8 kg. Sleeping and resting energy expenditures decreased in proportion to changes in body composition. Weight reduction significantly improved physiologic capacity for exercise in both groups of women, making it easier for them to be physically active. Black women had lower body composition-adjusted energy requirements than did white women-both before and after weight loss-during sleep (9% lower, 519 kJ/d; P < 0.001), at rest (14% lower, 879 kJ/d; P < 0.001), during exercise (6% lower; P < 0. 05), and as a daily total (9% lower, 862 kJ/d; P < 0.06). By contrast, free-living physical activity was similar between the groups.

CONCLUSIONS

Weight-reduced women had metabolic rates appropriate for their body sizes. Black women had lower resting and nonresting energy requirements in both overweight and normal-weight states than did white women and did not compensate with greater physical activity, potentially predisposing them to greater weight regain.

Authors+Show Affiliations

Departments of Nutrition Sciences, Human Studies, Biostatistics and Biomathematics, and Critical and Diagnostic Care and the General Clinical Research Center, the University of Alabama at Birmingham, 35294, USA. weinsier@shrp.uab.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

10799376

Citation

Weinsier, R L., et al. "Energy Expenditure and Free-living Physical Activity in Black and White Women: Comparison Before and After Weight Loss." The American Journal of Clinical Nutrition, vol. 71, no. 5, 2000, pp. 1138-46.
Weinsier RL, Hunter GR, Zuckerman PA, et al. Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss. Am J Clin Nutr. 2000;71(5):1138-46.
Weinsier, R. L., Hunter, G. R., Zuckerman, P. A., Redden, D. T., Darnell, B. E., Larson, D. E., ... Goran, M. I. (2000). Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss. The American Journal of Clinical Nutrition, 71(5), pp. 1138-46.
Weinsier RL, et al. Energy Expenditure and Free-living Physical Activity in Black and White Women: Comparison Before and After Weight Loss. Am J Clin Nutr. 2000;71(5):1138-46. PubMed PMID: 10799376.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss. AU - Weinsier,R L, AU - Hunter,G R, AU - Zuckerman,P A, AU - Redden,D T, AU - Darnell,B E, AU - Larson,D E, AU - Newcomer,B R, AU - Goran,M I, PY - 2000/5/9/pubmed PY - 2000/6/8/medline PY - 2000/5/9/entrez SP - 1138 EP - 46 JF - The American journal of clinical nutrition JO - Am. J. Clin. Nutr. VL - 71 IS - 5 N2 - BACKGROUND: The prevalence of obesity is higher in black than in white women. Differences in energy economy and physical activity may contribute to this difference. OBJECTIVE: The objective of this study was to compare free-living energy expenditure and physical activity in black and white women before and after weight loss. DESIGN: Participants were 18 white and 14 black women with body mass indexes (in kg/m(2)) between 27 and 30. Diet, without exercise, was used to achieve a weight loss of >/=10 kg and a body mass index <25. After 4 wk of energy balance in overweight and normal-weight states, body composition was assessed by using a 4-compartment model, sleeping and resting energy expenditures were assessed by using a chamber calorimeter, physiologic stress of exercise and exercise economy were measured by using standardized exercise tasks, and daily energy expenditure was assessed by using doubly labeled water. RESULTS: Weight loss averaged 12.8 kg. Sleeping and resting energy expenditures decreased in proportion to changes in body composition. Weight reduction significantly improved physiologic capacity for exercise in both groups of women, making it easier for them to be physically active. Black women had lower body composition-adjusted energy requirements than did white women-both before and after weight loss-during sleep (9% lower, 519 kJ/d; P < 0.001), at rest (14% lower, 879 kJ/d; P < 0.001), during exercise (6% lower; P < 0. 05), and as a daily total (9% lower, 862 kJ/d; P < 0.06). By contrast, free-living physical activity was similar between the groups. CONCLUSIONS: Weight-reduced women had metabolic rates appropriate for their body sizes. Black women had lower resting and nonresting energy requirements in both overweight and normal-weight states than did white women and did not compensate with greater physical activity, potentially predisposing them to greater weight regain. SN - 0002-9165 UR - https://www.unboundmedicine.com/medline/citation/10799376/Energy_expenditure_and_free_living_physical_activity_in_black_and_white_women:_comparison_before_and_after_weight_loss_ L2 - https://academic.oup.com/ajcn/article-lookup/doi/10.1093/ajcn/71.5.1138 DB - PRIME DP - Unbound Medicine ER -