北京郊区12～14岁男女学生骨密度的研究

Bone mineral density measurement in adolescent boys and girls in Beijing suburbs

目的 了解本市郊区 1 2～ 1 4岁少年男女骨密度 (BMD)的变化规律。方法 利用双能X射线骨密度仪对 30 6例健康男女中学生行左前臂、腰椎和全身扫描 ,按性别不同 ,每 1岁分 1个组。结果 该年龄段男女孩各部位BMD每年都有不同程度的增加 ,女孩高于男孩。各部位BMD以腰椎最高 ,全身总的BMD次之 ,前臂BMD最低。 1 2～ 1 3岁女孩身高与各部位BMD呈明显正相关 (P <0 0 1 ,r=0 331～ 0 62 1 ) ,1 3～ 1 4岁男孩身高与各部位BMD呈明显正相关 (P <0 0 1 ,r =0 339～0 662 )。体重与BMD始终相关 ,腰椎与全身总的BMD相关性最后 (P <0 0 0 1 ,r =0 674～ 0 81 1 )。结论 不同部位BMD的增长快慢不一 ,测量腰椎BMD能够较好地反映全身BMD状况 。

Objective To observe the changes of bone mineral density (BMD) in young boys and girls aged 12～14 years in Beijing suburbs Methods 306 healthy boys and girls undergoing left forearm, lumbar vertebra and whole body scanning with dual energy X ray bone densitometer were divided into groups according to sex and age Results BMD of the different sites always increased with age The annual growth rates of BMD in girls were higher than those in boys, the highest in lumbar vertebrae, the second in the total body, and the lowest in forearm BMD of the different sites highly correlated with the height in girls aged 12 13 years ( P<0 01, r =0 331-0 621),and in boys aged 13 14 years( P<0 01,r =0 339-0 662) The body weight always correlated with BMD in boys and girls Nevertheless, the highest correlation was found between BMD of lumbar spine and BMD of the total body ( P<0 001, r =0 674-0 811) Conclusions BMD of the different sites are different in the speed of growth between boys and girls Measurement of BMD of lumbar vertebrae can reflect BMD of the whole body Although both body height and weight influence BMD, the latter had stronger effect on BMD in boys and girls