Physiological responses to weight-loss intervention in inactive obese African-American and Caucasian women

J. N. Glass, W. C. Miller, L. M. Szymanski, B. Fernhall, J. L. Durstine

Research output: Contribution to journalArticle

Abstract

Background. The physiological responses of inactive obese premenopausal African-American and Caucasian women to the identical exercise training and behavior modification program were compared. Methods. Inactive obese (96.1±2.9 kg, BMI=34.8±0.7 kg/m2, % body fat=46.0±0.8; mean±SEM) premenopausal (36±2 yrs) African-American (n=10) and Caucasian (n=19) women were included. Resting metabolic rate (RMR), respiratory exchange ratio (RER), and maximal aerobic power (V̇O2max) were measured by indirect calorimetry, and body composition by plethysmography. Resting and maximal heart rates, blood glucose and lipids, and blood pressure were also measured. Treatment consisted of a 13-week diet and exercise behavior modification program. Group mean comparisons were made with a Student's "t"-test or an ANCOVA, which controlled for individual differences in body mass and lean body mass (LBM). Significance was set at p<0.05. Results. Initially, the groups were not significantly different in height, mass, BMI, age, % body fat, fat mass, LBM, girth measurements, RMR, RER, V̇O2max, blood pressure, or cholesterol profile. The number of weeks completed, number of exercise sessions completed, total minutes of exercise for the entire intervention, average minutes of daily exercise, and total estimated exercise energy expenditure were all similar between groups. Furthermore, both groups reported similar dietary compliance. Both groups reduced body mass, BMI, LBM, girth measurements, and increased V̇O2max (mlO2·kg-l·min-1) significantly and similarly. Conclusions. African-American and Caucasian women respond the same physiologically to weight loss intervention. The higher prevalence in obesity for African-American women is not due to a different physiological response to diet and exercise.

Original languageEnglish (US)
Pages (from-to)56-64
Number of pages9
JournalJournal of Sports Medicine and Physical Fitness
Volume42
Issue number1
StatePublished - Apr 17 2002

Keywords

  • Blacks
  • Caucasoid race
  • Diet
  • Exercise
  • Health behavior
  • Metabolism
  • Obesity, therapy
  • Weight loss
  • Women

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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