The influence of physical activity (PA) changes on risk of abdominal fat gain in midlife women has not been studied using objective measures and controlling for potentially confounding variables.
Changes in PA were assessed within a prospective cohort of 233 middle-age (40 ± 3 years), nonobese, nonsmoking, primarily Caucasian women by using accelerometers, worn continuously for 7 consecutive days at baseline and again at a 20 month follow-up. Weighed food intake diaries were completed on concurrent days. Bod Pod assessed total body fat. Abdominal fat was measured by abdominal circumference at the umbilicus.
Women who decreased PA gained abdominal fat across 20 months, while women who increased PA (F = 4.82, P = .009) did not. Change in PA remained an independent predictor of abdominal fat change after adjusting for potential confounders, including changes in total body fat and total energy intake. Compared with women who maintained or decreased PA, women who increased PA had approximately half the risk (RR = 0.52, 95% CI: 0.27, 0.98) of gaining abdominal fat.
Increasing daily physical activity may attenuate risk of abdominal fat gain in middle-age women independent of changes in total body fat or energy intake.
Davidson is with the Cardiovascular Genetics Division, University of Utah School of Medicine, Salt Lake City, UT. Tucker is with the Dept of Exercise Science, Brigham Young University, Provo, UT. Peterson is with the Dept of Health Sciences, College of Nursing and Health Sciences, University of Colorado at Colorado Springs, CO.