Association between physical activity and body fat percentage, with adjustment for BMI: a large crosssectional analysis of UK Biobank
Association between physical activity and body fat percentage, with adjustment for BMI: a large crosssectional analysis of UK Biobank
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DOI：
10.1136/bmjopen-2016-011843
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发表时间：
2017-03-01
期刊：
影响因子：
2.9
通讯作者：
Key, Timothy J.
中科院分区：
文献类型：
--
作者：
Bradbury, Kathryn E.;Guo, Wenji;Key, Timothy J.
目的：这项研究的目的是检验在考虑身体质量指数(BMI)后，在一般人群中，经常运动的成年人是否体脂较少。设计：对2006-2010年英国生物库招募的参与者进行横断面分析。地点：英国生物库在英国各地的评估中心。参与者：119 230名男性和140 578名女性，年龄40-69岁，有完整的体力活动信息，没有自我报告的长期疾病、残疾或疾病。说明：体力活动以过量代谢当量(MET)衡量--根据步行和中等强度体力活动的组合估计的每周小时数。结果：BMI与体脂百分比高度相关(女性r=0.85，男性r=0.79)，两者与体力活动呈负相关。与每周超标5小时相比，每周超标100小时与男性1.1公斤/米(2)体重指数(27.1比28.2公斤/米(2))和2.8个百分点的体脂(23.4%比26.3%)和2.2公斤/米(2)女性体重指数(25.6比27.7公斤/米(2))和4.0个百分点的体脂(33.9%比37.9%)相关。对于给定的BMI，更多的体力活动与较低的平均体脂百分比相关(BMI为22.5-24.99公斤/米(2)：2.0(95%可信区间1.8至2.2)，男性体脂降低百分点，女性体脂降低1.8(95%可信区间1.6至2.0)，相比<；=100个每周额外工作时间；每周超时5小时)。结论：在这个来自普通人群的中年成年人样本中，体力活动与BMI和体脂百分比呈负相关。对于体重指数相同的人来说，那些更活跃的人的体脂百分比更低。
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.