Zwiauer K F, Mueller T, Widhalm K
Department of Pediatrics, University of Vienna Medical School, Austria.
J Am Coll Nutr. 1992 Jun;11(3):267-71. doi: 10.1080/07315724.1992.10718227.
The aim of this study was to investigate the effect of daytime on resting energy expenditure (REE) and thermic effect of food (TEF), REE and TEF were measured in 11 obese boys (mean age +/- SD 11.9 +/- 1.6 years; body mass index 30.1 +/- 4.0 kg/m2) by indirect calorimetry (SensorMedics 2900) on two consecutive days: early in the morning (7:30 a.m.) on one day and at 12 noon on the other day or vice versa. REE was measured for 30 minutes and TEF for 180 minutes after a 600 kcal liquid meal containing 13% protein, 39% fat and 48% carbohydrates. REE measured in the morning was not statistically different from that measured at noon (2191 +/- 358 vs 2223 +/- 319 kcal/24 hours) and morning values were highly correlated with afternoon values (r2 = 0.805). Therefore we conclude that the effect of daytime is negligible for measurements of REE if the patients are in a postabsorptive state and avoid physical activity and stress 10-12 hours prior to measurements. The thermic effect of food calculated in the morning also was not statistically significantly from values found in the afternoon (8.2 +/- 8.8% in the morning and 6.6 +/- 7.5% in the afternoon). However, because of very high within-patient variability the correlation between morning and afternoon values was weaker than for REE (r2 = 0.289).
本研究的目的是调查白天对静息能量消耗（REE）和食物热效应（TEF）的影响。通过间接测热法（SensorMedics 2900）在连续两天对11名肥胖男孩（平均年龄±标准差11.9±1.6岁；体重指数30.1±4.0kg/m²）测量REE和TEF：一天清晨（上午7:30），另一天中午12点，或者反之。在摄入一顿含有13%蛋白质、39%脂肪和48%碳水化合物的600千卡流食后，测量REE 30分钟，测量TEF 180分钟。上午测量的REE与中午测量的REE无统计学差异（2191±358 vs 2223±319千卡/24小时），且上午值与下午值高度相关（r² = 0.805）。因此，我们得出结论，如果患者处于吸收后状态，且在测量前10 - 12小时避免体力活动和应激，则白天对REE测量的影响可忽略不计。上午计算的食物热效应与下午的值相比也无统计学显著差异（上午为8.2±8.8%，下午为6.6±7.5%）。然而，由于患者个体内差异非常大，上午和下午值之间的相关性比REE的相关性弱（r² = 0.289）。
