Hoyt R W, Jones T E, Baker-Fulco C J, Schoeller D A, Schoene R B, Schwartz R S, Askew E W, Cymerman A
US Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760.
Am J Physiol. 1994 Mar;266(3 Pt 2):R966-71. doi: 10.1152/ajpregu.1994.266.3.R966.
Estimates of total daily energy expenditure (TDEE) by the doubly labeled water (DLW, 2H(2)18O) and intake balance (I-B) methods were compared in six male soldiers studied over 6 days that included 5 days of strenuous winter exercise at 2,500- to 3,100-m elevation. Use of body energy stores [-9.54 +/- 1.54 (SD) MJ/day or -2,280 +/- 368 kcal/day] was estimated from changes in body weight, body density (hydrodensitometry), and total body water (H(2)18O dilution). The subjects wore computerized activity monitors and kept daily records of ration consumption (9.87 +/- 3.60 MJ/day or 2,359 +/- 860 kcal/day). Accuracy of individual DLW and I-B TDEE values was estimated from the correlations of TDEE with fat-free mass (FFM) or total weight (body wt + load). The DLW and I-B estimates of TDEE differed by -12.0 to 15.2% but provided comparable estimates of group mean TDEE (DLW = 19.07 +/- 2.37 MJ/day or 4,558 +/- 566 kcal/day; I-B = 19.41 +/- 3.72 MJ/day or 4,639 +/- 889 kcal/day; P > 0.05). The DLW TDEE was correlated with both FFM (r2 = 0.89, P < 0.01, power = 0.95) and total weight (r2 = 0.95, P < 0.01, power = 0.99), whereas I-B TDEE was correlated only with total weight (r2 = 0.75, P < 0.03, power = 0.81). Under adverse field conditions the DLW method provided individual TDEE estimates that were probably more accurate than those provided by the I-B method.
采用双标水法（DLW，2H₂¹⁸O）和摄入平衡法（I-B）对6名男性士兵的每日总能量消耗（TDEE）进行了估算，并在6天内进行了比较，这6天包括在海拔2500至3100米处进行的5天剧烈冬季训练。根据体重、身体密度（水下称重法）和总体水（H₂¹⁸O稀释法）的变化估算身体能量储备的使用情况[-9.54±1.54（标准差）兆焦耳/天或-2280±368千卡/天]。受试者佩戴计算机化活动监测器，并记录每日口粮消耗情况（9.87±3.60兆焦耳/天或2359±860千卡/天）。根据TDEE与去脂体重（FFM）或总体重（体重+负重）的相关性，估算个体DLW和I-B TDEE值的准确性。DLW和I-B对TDEE的估算值相差-12.0%至15.2%，但对组平均TDEE的估算值相当（DLW = 19.07±2.37兆焦耳/天或4558±566千卡/天；I-B = 19.41±3.72兆焦耳/天或4639±889千卡/天；P>0.05）。DLW TDEE与FFM（r² = 0.89，P<0.01，检验效能=0.95）和总体重（r² = 0.95，P<0.01，检验效能=0.99）均相关，而I-B TDEE仅与总体重相关（r² = 0.75，P<0.03，检验效能=0.81）。在恶劣的野外条件下，DLW法提供的个体TDEE估算值可能比I-B法更准确。
