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首页> 外文期刊>Pediatrics: Official Publication of the American Academy of Pediatrics >Childhood body composition in relation to body mass index.
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Childhood body composition in relation to body mass index.

机译：童年时期相对于体重指数的身体成分。

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OBJECTIVE: The aim is to describe body composition in relation to body mass index (BMI; body weight/stature(2)) to provide health care professionals insight into the meaning, significance, and limitations of BMI as an index of adiposity during childhood. METHODS: Data from 387 healthy, white children 8 to 18 years of age from the Fels Longitudinal Study were analyzed. Measurements were scheduled annually and each child was examined 1 to 11 times, totaling 1748 observations. Total body fat (TBF) and fat-free mass (FFM) were determined from hydrodensitometry. Stature and weight were measured using standard methods and BMI and the components of BMI, TBF/stature(2), and FFM/stature(2) were calculated. Analyses included correlations between BMI and body composition variables; age-related patterns of BMI, TBF/stature(2), and FFM/stature(2); and annual changes in BMI, TBF/stature(2), and FFM/stature(2). RESULTS: Generally, correlations between BMI and body composition variables were strong and significantly different from zero. Means for BMI throughout childhood were similar for boys and girls, although significantly larger values were observed for girls at ages 12 to 13 years. Age-related patterns of TBF/stature(2) and FFM/stature(2) differed between sexes. In each sex, annual increases in BMI were driven primarily by increases in FFM/stature(2) until late adolescence, with increases in TBF/stature(2) contributing to a larger proportion of the BMI increases in girls than in boys. CONCLUSIONS: Unlike adults, annual increases in BMI during childhood are generally attributed to the lean rather than to the fat component of BMI. Because the properties of BMI vary during childhood, health care professionals must consider factors such as age and sex when interpreting BMI.
机译：目的：目的是描述与体重指数（BMI;体重/身高（2））相关的身体成分，以使医疗保健专业人员深入了解BMI作为儿童肥胖指数的含义，意义和局限性。方法：对来自Fels纵向研究的387名8至18岁健康白人儿童的数据进行了分析。每年进行一次测量，每个孩子进行1到11次检查，总共观察1748次。通过水密度测定法测定总体内脂肪（TBF）和无脂肪质量（FFM）。使用标准方法和BMI测量身高和体重，并计算BMI，TBF /身高（2）和FFM /身高（2）的成分。分析包括体重指数与身体成分变量之间的相关性; BMI，TBF /身材（2）和FFM /身材（2）的年龄相关模式;以及BMI，TBF /身材（2）和FFM /身材（2）的年度变化。结果：通常，BMI与身体成分变量之间的相关性很强，并且与零之间存在显着差异。男孩和女孩整个童年的BMI均值相似，尽管12至13岁女孩的BMI值明显更高。性别相关的TBF /身材（2）和FFM /身材（2）的年龄相关模式有所不同。在每种性别中，BMI的年度增加主要是由FFM /身高（2）直到青春期晚期的驱动，而TBF /身高（2）的增加在女孩中的BMI增长中所占比例要大于男孩。结论：与成年人不同，儿童期BMI的年度增长通常归因于BMI的瘦弱而不是脂肪。由于BMI的属性在儿童时期有所不同，因此医疗保健专业人员在解释BMI时必须考虑年龄和性别等因素。

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