Pepper M Reese, Freeland-Graves Jeanne H, Yu Wurong, Stanforth Philip R, Xu Bugao
Department of Nutritional Sciences, The University of Texas at Austin, Austin, TX 78712.
J Test Eval. 2010 Jul 8;39(1):1-6. doi: 10.1520/JTE102871.
This paper reports the evaluation tests on the reliability and validity of a 3-dimensional (3D) laser body scanner for estimation of body volume and % fat. Repeated measures of body imaging were performed for reproducibility analysis. Validity of the instrument was assessed by comparison of measures of body volume by imaging to hydrodensitometry, and body fat was compared to hydrodensitometry and dual energy X-ray absorptiometry. Reproducibility analysis showed little difference between within-subjects measurements of volume (ICC ≥ 0.99, p < 0.01). Body volume estimations by laser body scanner and hydrodensitometry were strongly related (r = 0.99, p < 0.01), and agreement was high (ICC = 0.99, p < 0.01). Measurements of % body fat also agreed strongly with each other between methods (ICC = 0.86, p < 0.01), and mean % fat estimates by body imaging did not differ from criterion methods (p > 0.05). These findings indicate that the 3D laser body scanner is a reliable and valid technique for the estimation of body volume. Furthermore, body imaging is an accurate measure of body fat, as compared to dual energy X-ray absorptiometry. This new instrument is promising as a quick, simple to use, and inexpensive method of body composition analysis.
本文报告了一项用于评估三维（3D）激光人体扫描仪在估计身体体积和体脂百分比方面的可靠性和有效性的测试。对身体成像进行重复测量以进行再现性分析。通过将成像测量的身体体积与水下密度测量法进行比较来评估该仪器的有效性，并将身体脂肪与水下密度测量法和双能X线吸收法进行比较。再现性分析表明，受试者体内体积测量之间的差异很小（组内相关系数≥0.99，p<0.01）。激光人体扫描仪和水下密度测量法对身体体积的估计密切相关（r = 0.99，p<0.01），一致性很高（组内相关系数 = 0.99，p<0.01）。不同方法之间对体脂百分比的测量也高度一致（组内相关系数 = 0.86，p<0.01），通过身体成像估计的平均体脂百分比与标准方法没有差异（p>0.05）。这些发现表明，3D激光人体扫描仪是一种用于估计身体体积的可靠且有效的技术。此外，与双能X线吸收法相比，身体成像对身体脂肪的测量是准确的。这种新仪器有望成为一种快速、易于使用且廉价的身体成分分析方法。
