Lukaski H C, Siders W A, Nielsen E J, Hall C B
United States Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, ND 58202.
Am J Clin Nutr. 1994 Mar;59(3):578-85. doi: 10.1093/ajcn/59.3.578.
Determinations of total body water (TBW) calculated from deuterium dilution spaces and bioelectrical-impedance measurements were made serially in a group of 15 women before, during, and after pregnancy. Similar measurements were made once in a group of 50 nonpregnant women and intermittently in another group of 10 women during pregnancy and postpartum. TBW increased significantly during pregnancy, then decreased postpartum. Estimates of TBW in pregnancy and postpartum calculated with models derived from nonpregnant and pregnant women were similar to measured values. Changes in reactance and resistance explained more of the variance in predicting changes in TBW than did body weight, abdominal circumference, or hematocrit (50-75% vs 4-50%, respectively). Changes in TBW estimated with the nonpregnancy impedance model were significantly different than either the measured changes or changes predicted with the pregnancy impedance model. These findings indicate that the impedance method is a practical and valid method for determining longitudinal changes in TBW.
对15名女性在怀孕前、孕期和产后连续进行了通过氘稀释空间和生物电阻抗测量来计算总体水（TBW）的测定。对50名非孕妇女性进行了一次类似测量，并对另一组10名女性在孕期和产后进行了间歇性测量。孕期TBW显著增加，产后则下降。用源自非孕妇和孕妇的模型计算出的孕期和产后TBW估计值与测量值相似。电抗和电阻的变化在预测TBW变化方面比体重、腹围或血细胞比容能解释更多的方差（分别为50 - 75%对4 - 50%）。用非孕期阻抗模型估计的TBW变化与测量变化或用孕期阻抗模型预测的变化均有显著差异。这些发现表明，阻抗法是一种用于确定TBW纵向变化的实用且有效的方法。
