Percent body fat at age 5 predicts earlier pubertal development among girls at age 9
Percent body fat at age 5 predicts earlier pubertal development among girls at age 9
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DOI：
10.1542/peds.111.4.815
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发表时间：
2003-04-01
期刊：
影响因子：
8
通讯作者：
Birch, LL
中科院分区：
文献类型：
--
作者：
Davison, KK;Susman, EJ;Birch, LL
Objective.本研究以183名5 ~ 9岁的白色女孩为纵向样本，探讨了女孩体重状况与青春期时间之间的因果关系。女孩的体重状况（身体质量指数百分位数，体脂百分比，腰围）在他们5岁，7岁和9岁时进行评估，他们的青春期发育在他们9岁时进行评估（乳房发育，Ehrman，青春期发育量表）。将9岁时青春期发育的所有指标的信息结合起来，以确定相对于样本显示青春期发育较早（N = 44）和较晚（N = 136）的女孩。女孩在每个年龄段（5岁、7岁和9岁）的体重状况以及5至9岁体重状况的变化被用来预测她们在9岁时的青春期时间。5岁时体脂百分比较高的女孩，以及7岁时体脂百分比较高、BMI百分位数较高或腰围较大的女孩，更有可能在9岁时被归类为青春期发育较早。此外，从5岁到9岁身体脂肪百分比增加较大的女孩，以及从7岁到9岁腰围增加较大的女孩，更有可能在9岁时表现出更早的青春期发育。在控制加速生长后，结果仍然存在。在幼儿期体重状况较高的女孩更有可能表现出较早的青春期发育相对于同龄人在9年，表明体重状况之前的青春期女孩的时间。
Objective. This study examines the causal direction of the relationship between weight status and pubertal timing in girls using a longitudinal sample of 183 white girls followed from ages 5 to 9.Methods. Girls' weight status (body mass index percentile, percent body fat, waist circumference) was assessed when they were 5, 7, and 9 years old, and their pubertal development was assessed when they were 9 years old (breast development, Estradiol, Pubertal Development Scale). Information from all measures of pubertal development at 9 years was combined to identify girls exhibiting earlier (N = 44) and later (N = 136) pubertal development relative to the sample. Girls' weight status at each age (5, 7, and 9 years old) and change in weight status across the ages of 5 to 9 years were used to predict their pubertal timing at 9 years of age.Results. Girls with higher percent body fat at 5 years, and girls with higher percent body fat, higher BMI percentile, or larger waist circumference at 7 years, were more likely to be classified with earlier pubertal development at 9 years. In addition, girls showing larger increases in percent body fat from 5 to 9 years of age, and larger increases in waist circumference from 7 to 9 years of age, were more likely to exhibit earlier pubertal development at 9 years. Results were still present after controlling for accelerated growth.Conclusions. Girls with higher weight status in early childhood were more likely to exhibit earlier pubertal development relative to peers at 9 years, indicating that weight status preceded pubertal timing in girls.