Differences in body composition measurements assessed by air displacement plethysmography and dual-energy Xray absorptiometry in young and middle-aged Chinese adults
作者单位：国家儿童医学中心首都医科大学附属北京儿童医院儿童慢病管理中心 首都儿科研究所
会议名称：《中国营养学会第十五届全国营养科学大会》
会议日期：2022年
学科分类：12[管理学] 1204[管理学-公共管理] 120402[管理学-社会医学与卫生事业管理(可授管理学、医学学位)] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 10[医学]
关 键 词：Body composition analysis Dual-energy X-ray absorptiometry Air displacement plethysmography Chinese adults Comparative study
摘 要：Dual-energy X-ray absorptiometry(DXA) and air displacement plethysmography(ADP) are two widely used methods for body composition analysis(BCA). However, little is known about the discrepancies in the results of BCA obtained from the two methods in Chinese population. This study aimed to compare the measurement differences between DXA and ADP in young and middle-aged Chinese adults, and to explore the influential factors of this difference. Methods A total of 186 healthy volunteers(male(51.1%) vs. female(49.9%)) who aged 18-56 years old with body mass index(BMI) of 15.9-35.9 kg/m2 were enrolled. Fat mass(FM), fat mass percentage(FMP), and fat-free mass(FFM) were analyzed by both DXA and ADP within 1 hour. Results In general, all the BCA measures of DXA and ADP were highly correlated(intraclass correlation coefficient ICC0.80, P0.001), while significant differences were found between the two methods. At the population level, greater body fat estimates(FM and FMP), whereas lower FFM were found for DXA than ADP. Moreover, the average difference in FM and FMP as referred to ADP changed from positive in underweight group to negative in obesity group, and vice versa for FFM. At the individual level, the proportion of relative errors for FM and FMP within ±15% was less than 10% in underweight subjects and over 75% in those with obesity. For FFM, all underweight subjects had a relative error within 15%, and the proportion was 90.5% for obese males and 85.0% for obese females. Conclusion The differences in BCA results measured by DXA and ADP were strongly influenced by BMI status at both population and individual levels. Caution should be especially taken when interchanging body fat results measured by the two methods in underweight and obese subjects.