中文摘要：

目的：了解拉萨藏族成人体成分现状，进一步探讨拉萨藏族与锦州汉族体成分差异。方法：随机抽取拉萨藏族健康成人1149例（男为560例，女为589例），采用生物电阻抗法对所有受试者进行体成分的测量。所得数据经SPSS 200统计软件包进行统计学处理。结果：拉萨藏族成年男性除脂肪量、体脂率低于女性外，其他各项指标均高于女性，且性别间差异具有统计学意义。随着年龄增加，拉萨藏族成年男女性身高、蛋白质含量均逐渐降低，去脂体质量保持相对稳定，身体水分变化幅度相对较小；体质量、肌肉量、骨含量男性在30岁组、女性在40岁组达峰值，之后呈逐渐降低趋势；身体质量指数随年龄增加呈波动变化，男性30岁组出现1次小高峰，50岁组达峰值后开始下降，女性则是40岁组达峰值后出现一过性下降，50岁组后又开始呈增加趋势。男性脂肪含量出现2次高峰，分别是30岁组和50岁组，之后开始下降；体脂肪率随年龄增长呈增加趋势，50岁后女性增加幅度更明显，但男性呈下降趋势。拉萨藏族成人体成分各指标均值均低于锦州汉族成人男、女性，且差异具有统计学意义。结论：拉萨藏族成人体成分随年龄的增长发生变化，尤其在30、40岁年龄组变化明显；藏汉族体成分差异的原因，可能与两地居民生活环境、经济文化水平不同有关，尤其是海拔的差异可能是主要原因。

英文摘要：

Objective： To learn about the body composition of Tibetan adults and to further explore the differences between Tibetan adults in Lhasa and Han adults in Jinzhou. Methods： 1 149 Tibetan adults were randomly selected（560 males, 589 females）. Their body composition were checked by bioelectrical impedance analysis. All the results were input into the SPSS 20. 0 statistical package, and then processed by statistical analysis. Results： Men＇s body fat mass and body fat rate were lower than women, but the others were higher than women. With the increase of age, the height and protein content of Tibetan people were reduced gradually. Lean body weight remained relatively stable and relatively small variations were found in body water. Male body weight, body mass index, muscle mass and bone mass reached the peak in the 30 years group, and female reached the peak at the age of 40 which was then followed by a trend of gradual decrease. The two peaks of men in fat were 30 and 50 years group. Body fat rate increased along with the age increase. After 50 women increased more obviously, but the males were on the decline. Compared with Han in Jinzhou, the indicators of Tibetan adults in Lahsa were lower. Conclusion： The change with age is especially obvious in 30 and 40 years groups. Compared with Han in Jinzhou, the indicators of Tibetan adults in Lhasa are lower.