双能X线吸收法对体脂测量的应用  

Application of Dual Energy X-Ray Absorptiometry in Human Body Fat Composition Measurement

作　　者：王继红[1] 张源[3] 赵兴山[1] 徐黎[2] 程晓光[2] 

机构地区：[1]北京秋水潭医院北京大学第四临床医学院心内科,北京市100035 [2]北京秋水潭医院北京大学第四临床医学院放射科,北京市100035 [3]复旦大学附属中山医院心内科,上海市

出　　处：《中国循环杂志》2011年第3期212-215,共4页Chinese Circulation Journal

基　　金：北京市保健专项基金(编号:京06-03号)

摘　　要：目的:探索双能X线吸收(Dual Energy X-Ray Absorptiometry,DEXA)法测量体脂分布的应用价值。方法:对85名受试者应用体重测量仪测定法逐一测量简易体脂参数:身高、体重、腰围、臀围,以体重指数≥25 kg/m2为标准,区分为肥胖者52名,非肥胖者33名;参照2005年代谢综合征全球统一定义中国人中心性肥胖的切点,腹型肥胖的诊断标准:腰围≥90 cm(男性),腰围≥80 cm(女性),区分为腹型肥胖者47名,非腹型肥胖者38名。同时利用DEXA法记录体重、各部位脂肪含量,计算全身脂肪比例、腰臀部脂肪比;比较DEXA法和体重测量仪测定法测得的人体体重差异,分别比较体重指数与全身脂肪比例对肥胖检出的一致性,腰围与腰臀部脂肪比对腹型肥胖检出的一致性,并将男、女两者的腰臀部脂肪比与简易体脂参数进行相关性分析。结果:应用两种方法分别对85名受试者进行体重测量,DEXA法测得的结果为(69.07±13.05)kg,体重测量仪测得的结果为(70.24±13.22)kg,对两组测量结果进行配对t检验,P>0.05,差异无统计学意义。全身脂肪比例用于男、女性肥胖诊断的敏感性分别为73.33%、86.36%,特异性分别为100%、81.82%;腰臀部脂肪比用于男、女性腹型肥胖诊断的敏感性分别为73.08%、85.72%,特异性分别为73.33%、78.26%;男性的腰臀比、女性的腰围与腰臀部脂肪比相关系数最高。结论:DEXA技术可用于测定体脂含量及分布,全身脂肪比例判断肥胖症的切点男性为27.97%,女性为34.27%,腰臀部脂肪比判断腹型肥胖的切点男性为0.64,女性为0.49;男性测量腰臀比、女性测量腰围均能更好的预测腰臀部脂肪比。Objective：To investigate the application value of dual energy X-ray absorptiometry （DEXA） in human body fat composition and distribution measurement. Methods ：A total of 85 subjects were divided into Obesity group ,n= 52 and Non-obesity group ,n= 33 according to the standarc/of body weight≥25 kg/m^2. In addition, the same 85 subjects were divided into Intro-abdominal obesity group,n=47 and Nonintro-abdominal obesity group,n=38 according to the standard of waist circumference ≥90cem in male, ≥80 cm in female. All subjects were examined by body weighl index （BMI） method and DEXA method. The diagnostic index of obesity and intra-abdominal obesity were determined by DEXA. The body fat composition and distribution were analyzed in male and female subjects respectively. Results：There was no real difference of the body weight in 85 subjects between DEXA method and BMI method（69. 07± 13. 05）kg vs. （70. 24±13. 22） kg,P〉0. 05. DEXA method presented that the who/e body fat ratio for diagnosing the obesity had the sensitivity and specificity as 73.33% anti 100% in male,86. 36% and 81.82% in female. The whole body fat ratio for diagnosing the obesity had the cut-off point of 27.97% in male and 34. 27% in female. The waist-to-hip ratio for diagnosing the introabdominal obesity had the sensitivity and specificity as 73.08% and 73.33% in male, 85.72% and 78. 26% in female. The waist-to-hip ratio for diagnosing intra-abdominal obesity had the cut-off point of 0. 64 in male and 0. 49 in female. Conclusion：DEXA method could be valuable for human body fat composition and distribution measurement.

关 键 词：双能X线吸收 肥胖 腹型肥胖 

分 类 号：R541.4[医药卫生—心血管疾病]