Westerterp K R, Goran M I
Department of Human Biology, Maastricht University, The Netherlands.
Int J Obes Relat Metab Disord. 1997 Mar;21(3):184-8. doi: 10.1038/sj.ijo.0800385.
The doubly labeled water method for the measurement of average daily metabolic rate (ADMR), combined with a measurement of basal metabolic rate (BMR), permits the calculation of energy expenditure for physical activity. Thus, the relation between physical activity and body composition (%body fat) can be determined.
We analyzed existing data sets with observations on ADMR, BMR, and %body fat including 290 healthy subjects, age 18-49 y, 146 females and 144 males, from 22 different studies.
In a regression analysis, age explained 3-7% and 5-20% of the variation in %body fat in females and males, respectively. Adding physical activity to the model raised the explained variation in %body fat in males (partial r = -0.35, P < 0.01). A higher level of physical activity was related to a lower %body fat. In females, there was no relationship between physical activity and body composition (partial r = 0.00, n.s.).
In males, there is a significant inverse cross-sectional relationship between activity energy expenditure and percent body fat, whereas no such relationship was apparent in females.
采用双标水法测量平均每日代谢率（ADMR），并结合基础代谢率（BMR）的测量，可计算体力活动的能量消耗。因此，能够确定体力活动与身体成分（体脂百分比）之间的关系。
我们分析了现有的数据集，这些数据集包含了来自22项不同研究的290名年龄在18 - 49岁之间的健康受试者的ADMR、BMR和体脂百分比数据，其中女性146名，男性144名。
在回归分析中，年龄分别解释了女性和男性体脂百分比变化的3 - 7%和5 - 20%。将体力活动纳入模型后，男性体脂百分比的可解释变化增加（偏相关系数r = -0.35，P < 0.01）。较高水平的体力活动与较低的体脂百分比相关。在女性中，体力活动与身体成分之间没有关系（偏相关系数r = 0.00，无统计学意义）。
在男性中，活动能量消耗与体脂百分比之间存在显著的横断面负相关关系，而在女性中未观察到这种关系。
