Pennington Biomedical Research, Louisiana State University, Baton Rouge, LA, USA.
University of Hawaii Cancer Center, Honolulu, HI, USA.
Eur J Clin Nutr. 2020 Jun;74(6):920-929. doi: 10.1038/s41430-019-0501-2. Epub 2019 Sep 24.
BACKGROUND/OBJECTIVES: Three-dimensional optical (3DO) imaging systems that rapidly and accurately provide body shape and composition information are increasingly available in research and clinical settings. Recently, relatively low-cost and space efficient 3DO systems with the ability to report and track individual assessments were introduced to the consumer market for home use. This study critically evaluated the first 3DO imaging device intended for personal operation, the Naked Body Scanner (NBS), against reference methods.
PARTICIPANTS/METHODS: Circumferences at six standardized anatomic sites were measured with a flexible tape in 90 participants ranging in age (5-74 years), ethnicity, and adiposity. Regression analysis and Bland-Altman plots compared these direct measurements and dual-energy X-ray absorptiometry (DXA) %fat estimates to corresponding NBS values. Method precision was analyzed from duplicate anthropometric and NBS measurements in a subgroup of 51 participants.
The NBS exhibited greater variation in test-retest reliability (CV, 0.4-2.7%) between the six measured anatomic locations when compared with manually measured counterparts (0.2-0.4%). All six device-derived circumferences correlated with flexible tape references (Rs, 0.84-0.97; p < 0.0001). Measurement bias was apparent for three anatomic sites while mean differences were present for five. The NBS's %fat estimates also correlated with DXA results (R = 0.73, p < 0.0001) with no significant bias.
This system opens a new era of digital home-based assessments that can be incorporated into weight loss or exercise interventions accessible to clinical investigators as well as individual users.
背景/目的：能够快速、准确地提供身体形态和成分信息的三维光学（3DO）成像系统在研究和临床环境中越来越普及。最近，具有报告和跟踪个体评估能力的相对低成本、节省空间的 3DO 系统已被引入消费市场，供家庭使用。本研究对首款旨在个人操作的 3DO 成像设备——裸体扫描仪（NBS）进行了严格评估，将其与参考方法进行了比较。
参与者/方法：90 名参与者的年龄（5-74 岁）、种族和肥胖程度各不相同，在六个标准化解剖部位使用柔性卷尺测量周长。回归分析和 Bland-Altman 图比较了这些直接测量值和双能 X 射线吸收法（DXA）%脂肪估计值与相应的 NBS 值。在 51 名参与者的亚组中，从重复的人体测量和 NBS 测量中分析了方法精度。
与手动测量相比，NBS 在六个测量解剖部位的测试-重测可靠性（CV，0.4-2.7%）方面表现出更大的变化（0.2-0.4%）。所有六个设备衍生的周长与柔性卷尺参考值均相关（Rs，0.84-0.97；p<0.0001）。三个解剖部位存在测量偏差，而五个解剖部位存在平均差异。NBS 的%脂肪估计值也与 DXA 结果相关（R=0.73，p<0.0001），无显著偏差。
该系统开创了数字家庭评估的新时代，可纳入减肥或运动干预措施，可供临床研究人员和个体用户使用。
