Free-living activity energy expenditure in women successful and unsuccessful at maintaining a normal body weight

摘要: BACKGROUND Although physical inactivity is believed to contribute the rising prevalence of obesity, role and magnitude its contribution weight gain are unknown. OBJECTIVE We compared total free-living activity energy expenditure (AEE) level in women successful unsuccessful at maintaining a normal body weight. DESIGN Premenopausal, generally sedentary were studied their 1 y later after no intervention. Two groups identified on basis extreme changes: maintainers (n = 27) had less-than-or-equal 3% initial ( 2 kg/y) gainers 20) >10% (>6 kg/y). At baseline follow-up, evaluations conducted during 4 wk diet-controlled, energy-balance conditions. Free-living AEE assessed with use doubly labeled water, exercise economy muscle strength standardized tests, sleeping EE substrate utilization chamber calorimetry. RESULTS Maintainers lost mean (plus minusSD) 0.5 plus minus 2.2 kg/y gained 9.5 2.1 kg/y. Gainers lower (P < 0.02), 0.01), less 0.001); these differences between remained significant from follow-up. Sleeping EE, economy, or 24-h not significantly different groups. A explained approximately 77% greater y. CONCLUSION The general US population should increase daily levels decrease obesity.