Schulz S, Westerterp K R, Brück K
Department of Physiology, Justus Liebig University, Giessen, FRG.
Am J Clin Nutr. 1989 Jun;49(6):1146-54. doi: 10.1093/ajcn/49.6.1146.
Average daily energy expenditure determined by the doubly labeled water technique (dlwEE) was compared in six subjects (aged 20-30 y) over 2 wk under usual living conditions; average food energy intake and energy expenditure estimated from individual diary records of physical activity. In addition, energy expenditure was estimated from 24-h heart rate recordings carried out on two randomly chosen days of the 2-wk period. The group means of the dlwEE were 1.94 +/- 0.24 (means +/- SD) times larger than resting metabolic rate (= 1.94 met) and nearly identical to the average daily energy intake (1.93 +/- 0.23 met). Energy expenditure estimated from the diaries of activity and from the 24-h heart rate recording varied between 1.67 and 2.24 met depending on the calculation procedure. The dlwEE (1.94 +/- 0.24 met) is much higher than that recently determined for sedentary people (1.25 met) and thus explains that young students may achieve body weight balance with a relatively high daily food energy intake.
在正常生活条件下，对6名年龄在20 - 30岁的受试者进行了为期2周的研究，比较了通过双标水技术测定的平均每日能量消耗（dlwEE）；根据个人体力活动日记记录估算平均食物能量摄入量和能量消耗。此外，在为期2周的时间段内随机选择的两天进行24小时心率记录，据此估算能量消耗。dlwEE的组均值比静息代谢率（= 1.94代谢当量）大1.94 +/- 0.24（均值 +/- 标准差）倍，且与平均每日能量摄入量（1.93 +/- 0.23代谢当量）几乎相同。根据活动日记和24小时心率记录估算的能量消耗，因计算方法不同而在1.67至2.24代谢当量之间变化。dlwEE（1.94 +/- 0.24代谢当量）远高于最近测定的久坐不动人群的数值（1.25代谢当量），因此可以解释为什么年轻学生通过相对较高的每日食物能量摄入量就能实现体重平衡。
