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Titolo:
Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss
Autore:
Weinsier, RL; Hunter, GR; Zuckerman, PA; Redden, DT; Darnell, BE; Larson, DE; Newcomer, BR; Goran, MI;
Indirizzi:
Univ Alabama, Dept Nutr Sci, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 t Nutr Sci, Birmingham, AL 35294 USA Univ Alabama, Dept Human Studies, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 an Studies, Birmingham, AL 35294 USA Univ Alabama, Dept Biostat & Biomath, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 & Biomath, Birmingham, AL 35294 USA Univ Alabama, Dept Crit & Diagnost Care, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 gnost Care, Birmingham, AL 35294 USA Univ Alabama, Gen Clin Res Ctr, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 in Res Ctr, Birmingham, AL 35294 USA
Titolo Testata:
AMERICAN JOURNAL OF CLINICAL NUTRITION
fascicolo: 5, volume: 71, anno: 2000,
pagine: 1138 - 1146
SICI:
0002-9165(200005)71:5<1138:EEAFPA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
OBESE AFRICAN-AMERICAN; RESTING METABOLIC-RATE; BODY-COMPOSITION; SUBSTRATE UTILIZATION; CARDIOVASCULAR RISK; CAUCASIAN WOMEN; UNITED-STATES; P-31 MRS; EXERCISE; PREMENOPAUSAL;
Keywords:
overweight; obesity; weight loss; body composition; energy expenditure; aerobic capacity; energy economy; physical activity; exercise; African American women; white women;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Weinsier, RL Univ Alabama, Dept Nutr Sci, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 irmingham, AL 35294 USA
Citazione:
R.L. Weinsier et al., "Energy expenditure and free-living physical activity in black and white women: comparison before and after weight loss", AM J CLIN N, 71(5), 2000, pp. 1138-1146

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 greater than or equal to 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 groupsof 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.

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Documento generato il 07/07/20 alle ore 19:11:41