GENUD (Growth, Exercise, NUtrition and Development) Research Group, Universidad de Zaragoza, Zaragoza, Spain.
Obesity (Silver Spring). 2012 Jan;20(1):221-8. doi: 10.1038/oby.2011.272. Epub 2011 Aug 25.
To increase knowledge about reliability and intermethods agreement for body fat (BF) is of interest for assessment, interpretation, and comparison purposes. It was aimed to examine intra- and inter-rater reliability, interday variability, and degree of agreement for BF using air-displacement plethysmography (Bod-Pod), dual-energy X-ray absorptiometry (DXA), bioelectrical impedance analysis (BIA), and skinfold measurements in European adolescents. Fifty-four adolescents (25 females) from Zaragoza and 30 (14 females) from Stockholm, aged 13-17 years participated in this study. Two trained raters in each center assessed BF with Bod-Pod, DXA, BIA, and anthropometry (DXA only in Zaragoza). Intermethod agreement and reliability were studied using a 4-way ANOVA for the same rater on the first day and two additional measurements on a second day, one each rater. Technical error of measurement (TEM) and percentage coefficient of reliability (%R) were also reported. No significant intrarater, inter-rater, or interday effect was observed for %BF for any method in either of the cities. In Zaragoza, %BF was significantly different when measured by Bod-Pod and BIA in comparison with anthropometry and DXA (all P < 0.001). The same result was observed in Stockholm (P < 0.001), except that DXA was not measured. Bod-Pod, DXA, BIA, and anthropometry are reliable for %BF repeated assessment within the same day by the same or different raters or in consecutive days by the same rater. Bod-Pod showed close agreement with BIA as did DXA with anthropometry; however, Bod-Pod and BIA presented higher values of %BF than anthropometry and DXA.
为了提高对体脂（BF）可靠性和方法间一致性的认识，评估、解释和比较体脂非常重要。本研究旨在检测使用空气置换体描记法（Bod-Pod）、双能 X 射线吸收法（DXA）、生物电阻抗分析（BIA）和皮褶测量法在欧洲青少年中评估 BF 的日内变异性和方法间一致性。本研究共纳入来自萨拉戈萨的 54 名青少年（25 名女性）和来自斯德哥尔摩的 30 名青少年（14 名女性），年龄为 13-17 岁。每个中心的两名经过培训的评估员使用 Bod-Pod、DXA、BIA 和人体测量法（仅在萨拉戈萨使用 DXA）评估 BF。采用 4 向方差分析评估同一评估员在第一天的方法间一致性和可靠性，并在第二天再进行两次额外的测量，每个评估员各进行一次。还报告了测量技术误差（TEM）和可靠性百分比（%R）。在两个城市中，任何方法的任何测量方法的任何测量方法，都没有观察到明显的日内、评估员间或评估员内效应。在萨拉戈萨，与人体测量法和 DXA 相比，Bod-Pod 和 BIA 测量的 BF%明显不同（均 P < 0.001）。在斯德哥尔摩也观察到了同样的结果（P < 0.001），但未测量 DXA。Bod-Pod、DXA、BIA 和人体测量法可用于在同一天由同一或不同评估员或在同一评估员连续几天内重复评估 BF%。Bod-Pod 与 BIA 具有高度一致性，DXA 与人体测量法也具有高度一致性；然而，Bod-Pod 和 BIA 测量的 BF%值高于人体测量法和 DXA。
