Dept of Epidemiology and Biostatistics, School of Public Health, Indiana University, Bloomington, IN.
J Phys Act Health. 2016 Apr;13(4):416-8. doi: 10.1123/jpah.2015-0152. Epub 2015 Oct 7.
Physical activity is important for maintaining healthy weight. The time of day when exercise is performed-a highly discretionary aspect of behavior-may impact weight control, but evidence is limited. Thus, we examined the association between the timing of physical activity and obesity risk in women.
A cross-sectional analysis was conducted among 7157 Women's Health Study participants who participated in an ancillary study begun in 2011 that is measuring physical activity using accelerometers. The exposure was percentage of total accelerometer counts accumulated before 12:00 noon and the outcome was obesity.
Mean (±SD) BMI among participants was 26.1 (±4.9) kg/m2 and 1322 women were obese. The mean activity counts per day was 203,870 (±95,811) of which a mean 47.1% (±11.5%) were recorded in the morning. In multivariable-adjusted models, women who recorded < 39% (lowest quartile) of accelerometer counts before 12:00 noon had a 26% higher odds of being obese, compared with those recording ≥ 54% (highest quartile) of counts before noon (Ptrend = 0.02).
These study findings-that women who are less active during morning hours may be at higher risk of obesity-if confirmed can provide a novel strategy to help combat the important health problem of obesity.
身体活动对于维持健康体重很重要。运动的时间——行为中高度自主的一个方面——可能会影响体重控制，但证据有限。因此，我们研究了女性身体活动时间与肥胖风险之间的关联。
对参加 2011 年开始的一项使用加速度计测量身体活动的辅助研究的 7157 名妇女健康研究参与者进行了横断面分析。暴露因素为上午 12 点前累积的总加速度计计数百分比，结局为肥胖。
参与者的平均（±SD）BMI 为 26.1（±4.9）kg/m2，1322 名女性肥胖。每天的平均活动计数为 203870（±95811），其中上午记录的平均活动计数为 47.1%（±11.5%）。在多变量调整模型中，与上午 12 点前记录的加速度计计数≥54%（最高四分位数）的女性相比，上午 12 点前记录的计数<39%（最低四分位数）的女性肥胖的可能性高 26%（Ptrend=0.02）。
这些研究结果表明，如果得到证实，在早晨活动较少的女性可能面临更高的肥胖风险，如果得到证实，这可以为对抗肥胖这一重要健康问题提供一种新策略。
