Soares M J, Piers L S, Kraai L, Shetty P S
Department of Physiology, St John's Medical College, Bangalore, India.
Eur J Clin Nutr. 1989 Jul;43(7):465-72.
Variations in BMR, body weight and energy intake were measured for 14 consecutive days in 6 young adults on ad libitum energy intakes, whose physical activity was uncontrolled. Energy intakes showed significant differences between days (P less than 0.025, CV = 6.7 per cent), between weeks (P less than 0.005, CV = 8.9 per cent) and between subjects (P less than 0.005, CV = 7.9 per cent). Energy intakes were 14 per cent higher (P less than 0.01) at weekends. Intra-individual variance contributed up to 86 per cent of the total variance in the energy intake. Replicate BMR measurements showed non-significant differences from day to day (CV less than 1.5 per cent), a training effect from week to week (P less than 0.05, CV = 1.5 per cent), and significant differences between subjects (P less than 0.001, CV = 12.4 per cent). Intra-individual variance contributed only 14 per cent to the total variance in BMR. There were no significant changes in body weight (CV = 0.7 per cent) or fat-free mass during the study. Auto-correlations of BMR, body weight and energy intake were non-significant at the different lag times studied. Cross-correlations between the above parameters were also non-significant for each subject. It is concluded that despite wide fluctuations in energy intake from day to day within an individual, the variations in BMR are small with a true CV of less than 1.5 per cent. Hence these variations are unlikely to be important while assessing energy requirements on the basis of the FAO/WHO/UNU (1985) BMR factorial method.
对6名随意摄入能量、身体活动未受控制的年轻成年人连续14天测量其基础代谢率（BMR）、体重和能量摄入量的变化。能量摄入量在各天之间（P<0.025，变异系数[CV]=6.7%）、各周之间（P<0.005，CV=8.9%）以及个体之间（P<0.005，CV=7.9%）均显示出显著差异。周末的能量摄入量高出14%（P<0.01）。个体内差异占能量摄入总差异的比例高达86%。重复测量的基础代谢率在每日之间差异不显著（CV<1.5%），每周有训练效应（P<0.05，CV=1.5%），个体之间差异显著（P<0.001，CV=12.4%）。个体内差异仅占基础代谢率总差异的14%。研究期间体重（CV=0.7%）或去脂体重无显著变化。在研究的不同延迟时间，基础代谢率、体重和能量摄入量的自相关性均不显著。上述参数之间的交叉相关性对每个个体也不显著。得出的结论是，尽管个体每日能量摄入量波动很大，但基础代谢率的变化很小，真实的变异系数小于1.5%。因此，在根据粮农组织/世界卫生组织/联合国大学（1985年）基础代谢率因子法评估能量需求时，这些变化不太可能具有重要意义。
