Relation of BMI to fat and fat-free mass among children and adolescents
Relation of BMI to fat and fat-free mass among children and adolescents
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DOI：
10.1038/sj.ijo.0802735
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发表时间：
2005-01-01
影响因子：
4.9
通讯作者：
Horlick, M
中科院分区：
文献类型：
--
作者：
Freedman, DS;Wang, J;Horlick, M
目的：虽然体重指数（BMI，kg/m2）被广泛用作肥胖的替代指标，但它是相对于身高的超重指标，而不是多余的身体脂肪。我们研究了BMI与健康5- 18-year-olds.Methods和Procedures之间的脂肪质量和无脂肪质量水平的关系：双能X射线吸收法被用来测量脂肪和无脂肪质量之间的1196科目。通过计算脂肪质量指数（FMI，fatmass/ht（2））和去脂肪质量指数（FFMI，fat-free mass/ht（2）），将这些测量标准化为身高。结果：FFMI的变异性约为FMI的50%，BMI作为肥胖测量的准确性根据肥胖程度有很大差异。在BMI大于或等于85 th P的儿童中，BMI水平与FMI密切相关（在性别-年龄分类中r=0.85-0.96）。相比之下，在年龄BMI
Objective: Although the body mass index (BMI, kg/m(2)) is widely used as a surrogate measure of adiposity, it is a measure of excess weight, rather than excess body fat, relative to height. We examined the relation of BMI to levels of fat mass and fat-free mass among healthy 5- to 18-y-olds.Methods and Procedures: Dual-energy X-ray absorptiometry was used to measure fat and fat-free mass among 1196 subjects. These measures were standardized for height by calculating the fat mass index (FMI, fat mass/ht(2)) and the fat-free mass index (FFMI, fat-free mass/ht(2)).Results: The variability in FFMI was about 50% of that in FMI, and the accuracy of BMI as a measure of adiposity varied greatly according to the degree of fatness. Among children with a BMI-for-age greater than or equal to85th P, BMI levels were strongly associated with FMI (r=0.85-0.96 across sex-age categories). In contrast, among children with a BMI-for-age