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摘要
Objectives: The objective of this study was to examine if, in the general population, physically active adults have less body fat after taking body mass index (BMI) into account. Design: A cross- sectional analysis of participants recruited into UK Biobank in 2006- 2010. Setting: UK Biobank assessment centres throughout the UK. Participants: 119 230 men and 140 578 women aged 40- 69 years, with complete physical activity information, and without a self- reported long- term illness, disability or infirmity. Exposures: Physical activity measured as excess metabolic equivalent(MET)- hours per week, estimated from a combination of walking, and moderate and vigorous physical activity. BMI from measured height and weight. Main outcome measure: Body fat percentage estimated from bioimpedance. Results: BMI and body fat percentage were highly correlated (r= 0.85 in women; r= 0.79 in men), and both were inversely associated with physical activity. Compared with < 5 excess MET- hours/ week at baseline, >= 100 excess MET- hours/ week were associated with a 1.1 kg/ m(2) lower BMI (27.1 vs 28.2 kg/ m(2)) and 2.8 percentage points lower body fat (23.4% vs 26.3%) in men, and 2.2 kg/ m(2) lower BMI (25.6vs27.7 kg/ m(2)) and 4.0 percentage points lower body fat (33.9% vs 37.9%) in women. For a given BMI, greater physical activity was associated with lower average body fat percentage (for a BMI of 22.5- 24.99 kg/ m(2): 2.0 (95% CI 1.8 to 2.2), percentage points lower body fat in men and 1.8 (95%CI1.6 to 2.0) percentage points lower body fat in women, comparing >= 100 excess MET- hours per week with < 5 excess MET- hours/ week). Conclusions: In this sample of middle- aged adults, drawn from the general population, physical activity was inversely associated with BMI and body fat percentage. For people with the same BMI, those who were more active had a lower body fat percentage.
- 出版日期2017-3
