极低热量饮食减重期间全身氮的变化。

Changes in total body nitrogen during weight reduction by very-low-calorie diets.

作者信息

Morgan W D, Ryde S J, Birks J L, Thomas D W, Kreitzman S N

机构信息

Department of Medical Physics and Clinical Engineering, Singleton Hospital, Wales, UK.

出版信息

Am J Clin Nutr. 1992 Jul;56(1 Suppl):262S-264S. doi: 10.1093/ajcn/56.1.262S.

DOI:10.1093/ajcn/56.1.262S

PMID:1615896

Abstract

Body composition measurements, including total body nitrogen (TBN) by in vivo neutron activation analysis, were made on 11 female volunteers before and after an 11-wk very-low-calorie diet (VLCD) [1695 kJ (405 kcal) 6.7 g N]. Mean body mass index (BMI) changed from 32.1 to 26.2 kg/m2, corresponding to a mean weight loss of 16.2 +/- 2.4 (SD) kg. The mean loss of TBN was 125 +/- 57 g, equivalent to 781 +/- 356 g protein. The fat-free mass (FFM) component of the weight loss was calculated by two different methods as 23.5% (+/- 3% SEM) and 22.8% (+/- 2.7% SEM), respectively, thereby demonstrating the improved protein sparing of ketogenic VLCDs. FFM loss was not clearly related to BMI.

摘要

对11名女性志愿者在为期11周的极低热量饮食（VLCD，1695千焦（405千卡），6.7克氮）前后进行了身体成分测量，包括通过体内中子活化分析测定全身氮（TBN）。平均体重指数（BMI）从32.1变为26.2千克/平方米，相当于平均体重减轻了16.2±2.4（标准差）千克。TBN的平均损失为125±57克，相当于781±356克蛋白质。通过两种不同方法计算出减肥过程中无脂肪体重（FFM）部分分别为23.5%（±3%标准误）和22.8%（±2.7%标准误），从而证明生酮VLCDs对蛋白质的节约作用有所改善。FFM损失与BMI没有明显关联。