男性青少年脂肪组织分布与相对骨龄的关系——Fels追踪研究

ASSOCIATION OF ADIPOSE TISSUE DISTRIBUTION WITH RELATIVE SKELETAL AGE IN BOYS: FELS LONGITU-DINAL STUDY

本文对Fels追踪研究中8—17岁男性青少年的相对骨龄与脂肪分布类型之间的关系做了分析。按体重/身高~2调整后,如用每个年龄的三种皮褶厚度(ST)指数的均值表示脂肪分布类型的话,8—12岁时,脂肪分布类型呈外周型分布,但13岁后开始朝向心型发展呈全身性分布。如用肩胛下ST/(肩胛下ST+肱三头肌区ST)的比例表示的话,那么14—17岁时,相对骨龄早者(简称早组)与相对骨龄晚者(简称晚组)相比,前者有较明显的向心型分布倾向。13—14岁时,早组的上述比值的年增长明显大于晚组。但是,按脂肪分布类型指数等级的基线和体重/身高~2调整之后,7、11或14岁时的相对骨龄不能预测17岁时的脂肪分布类型指数的等级。所以,我们可以得出这样的结论:如按本文的比例指数加以定量的话,脂肪分布类型与男性青少年的相对骨龄只有微弱的关系。他们的脂肪分布类型可能与其它成熟指征(如男性青春期的第二性征)有明显的关系。

The association between relative skeletal age and fat patterning was analyzed using data from the Fels Longitudinal Study for boys at the chronological ages 8-17 years old. Fat patterning, as indicated by age-specific means for three skinfold thickness indices adjusted for weight/stature2, was peripheral between 8 and 12 years of chronological age but began to increase in a centripetal direction towards a generalized distribution after 13 years old. From 14 to 17 years of the chronological age, boys with advanced relative skeletal ages had more centripetal fat patterns, as indicated by the ratio subscapular/(subscapular+triceps) skinfold, than those with retarded skeletal ages. The mean annual increment in this ratio was significantly greater from 13, to 14 years of chronological age in boys with advanced relative skeletal ages than in those with retarded relative skeletal ages. Fat pattern index scores at 17 years of chronological age, however, could not be predicted from relative skeletal ages at 7, 11 or 14 years old after adjustment for baseline fat pattern indexscores and weight/stature. It was concluded that fat patterning, as quantified by the ratio indices used in this study, was associated only weakly with relative skeletal age in boys. Fat patterning may be associated more strongly with other indicators of relative maturity such as secondary sex characteristics in adolescent boys.