拉萨藏族儿童青少年跟骨骨强度的年龄变化及其影响因素

目的:收集拉萨藏族儿童青少年骨强度指数数据,探讨其随年龄变化规律并分析年龄、性别、身高、体质量、体质量指数(BMI)、去脂体质量、脂肪质量、肌肉质量、基础代谢对该人群骨强度指数的影响。方法:采用随机整群抽样法抽取拉萨藏族儿童青少年共1 227例(男592例,女635例),定量骨超声测量跟骨骨强度指数,生物电阻抗法检测体成分,所获数据录人SPSS20.0软件,进行统计分析。结果:拉萨藏族儿童青少年随着年龄增加,骨强度指数及其影响因素均呈上升趋势;同年龄组间比较,骨强度指数仅在8岁组出现性别差异;其他指标多在12岁以后出现显著性别差异。女性10～15岁,骨强度指数增长较快;而男性12岁以后开始快速增长。骨强度指数与年龄、身高、体质量、BMI、去脂体质量、脂肪质量、肌肉质量及基础代谢均呈正相关关系。多元线性回归分析显示,体质量、年龄和去脂体质量是跟骨骨强度指数的主要影响因素。结论:拉萨藏族儿童青少年男女跟骨骨强度指数变化规律不一致,其主要影响因素为体质量、年龄及去脂体质量。

A survey of calcaneus bone status and the influencing factors in Tibetan children and adolescents in Lhasa

Objective:To explore the growth pattern of calcaneus strength index by collecting the bone strength index of Tibetan children and adolescents in Lhasa,and to analyze its relationship with age,gender,height,weight,body mass index (BMI),lean body weight,fat mass,muscle mass and basal metabolism.Methods:Totally 1227 healthy children and adolescent subjects whose parents were Tibetans in Lhasa (592 males,635 females)were randomly selected.The bone strength index was measured by ultrasonic bone density apparatus.Bioelectric impedance technique was used to test the body composition indices.All the collected data were analyzed with SPSS 20.0.Results:The bone strength index and the influencing factors increased with age.Comparison between the same age group showed that the gender differences of bone strength index was statistically significant in only 8 years old group while the other differences were significant from 12 years old.In females,bone strength index was growing rapidly between 10 to 15 years old;while the males began to grow rapidly from the age of 12.The age,height,weight,BMI,lean body weight,fat mass,muscle mass and basal metabolism were positively correlated with bone strength index.Multiple linear regression revealed that weight,age and lean body weight significantly predicted bone strength index.Conclusion:The change of bone strength index in males is different from females. Weight,age and lean body weight are influencing factors for bone strength index of children and adolescents.