Ekelund Ulf, Aman Jan, Yngve Agneta, Renman Cecilia, Westerterp Klaas, Sjöström Michael
Unit for Preventive Nutrition, Department of Medical Nutrition/Biosciences, Karolinska Institutet, Stockholm, Sweden.
Am J Clin Nutr. 2002 Nov;76(5):935-41. doi: 10.1093/ajcn/76.5.935.
The influence of physical activity on body weight in children and adolescents is controversial.
The objective was to test the hypothesis that the intensity and duration of physical activity differ between obese and normal-weight adolescents, with no difference in estimated energy expenditure.
We compared physical activity in 18 (8 males, 10 females) obese [body mass index (in kg/m(2)) > 30] adolescents (14-19 y) with that in a matched, normal-weight (BMI < 27) control group. Total energy expenditure (TEE) was measured with the doubly labeled water method, and physical activity was measured simultaneously by accelerometry. The physical activity level was determined as the ratio of TEE to the resting metabolic rate (RMR) and activity energy expenditure as 0.9 TEE minus RMR. Accelerometry data included total physical activity (counts x min(-1) x d(-1)), accumulated and continuous duration of activity, and continuous 10-min periods of physical activity of moderate intensity.
There was no significant difference in adjusted (analysis of covariance) TEE, RMR, or AEE between groups. The physical activity level was significantly lower (P < 0.05) in the obese group. No sex x group interaction was observed. Differences in total physical activity (P < 0.001), accumulated time (P < 0.05), continuous time (P < 0.01), and continuous 10-min periods of physical activity of moderate intensity (P < 0.01) were observed between groups.
Obese adolescents are less physically active than are normal-weight adolescents, but physical activity-related energy expenditure is not significantly different between groups. The data suggest that physical activity is not necessarily equivalent to the energy costs of activity.
体育活动对儿童和青少年体重的影响存在争议。
检验肥胖青少年与正常体重青少年的体育活动强度和持续时间存在差异，但估计能量消耗无差异这一假设。
我们比较了18名（8名男性，10名女性）肥胖[体重指数（kg/m²）>30]青少年（14 - 19岁）与匹配的正常体重（BMI<27）对照组的体育活动情况。采用双标水法测量总能量消耗（TEE），同时通过加速度计测量体育活动。身体活动水平定义为TEE与静息代谢率（RMR）的比值，活动能量消耗为0.9TEE减去RMR。加速度计数据包括总身体活动量（计数×分钟⁻¹×天⁻¹）、活动的累计和持续时间，以及持续10分钟的中等强度身体活动时段。
两组之间经调整（协方差分析）的TEE、RMR或AEE无显著差异。肥胖组的身体活动水平显著较低（P<0.05）。未观察到性别×组间交互作用。两组之间在总身体活动量（P<0.001）、累计时间（P<0.05）、持续时间（P<0.01）以及持续10分钟的中等强度身体活动时段（P<0.01）方面存在差异。
肥胖青少年的身体活动比正常体重青少年少，但两组之间与体育活动相关的能量消耗无显著差异。数据表明，体育活动不一定等同于活动的能量消耗。
