McCarthy Cassidy, Tinsley Grant M, Ramirez Sophia, Heymsfield Steven B
Pennington Biomedical Research Center Louisiana State University System Baton Rouge Louisiana USA.
Department of Kinesiology and Sport Management Texas Tech University Lubbock Texas USA.
Obes Sci Pract. 2024 Nov 29;10(6):e70025. doi: 10.1002/osp4.70025. eCollection 2024 Dec.
Smartphone applications (apps) with optical imaging capabilities are transforming the field of physical anthropometry; digital measurements of body size and shape in clinical settings are increasingly feasible. Currently available apps are usually designed around the capture of two-dimensional images that are then transformed with app software to three-dimensional (3D) avatars that can be used for digital anthropometry. The aim of the current study was to compare waist circumference (WC), hip circumference (HC), four other circumferences (right/left upper arm, thigh) and WC/HC evaluated with a novel high-precision 3D smartphone app to ground-truth measurements made with a flexible tape by a trained anthropometrist.
Forty-four participants aged 20-78 years and body mass index 18.5-48.5 kg/m completed digital and manual circumference evaluations and dual-energy X-ray absorptiometry for visceral adipose tissue mass (VAT).
3D-digital and ground-truth tape WC, HC, and WC/HC estimates were highly correlated ( s, 0.90-0.97, < 0.001), mean 3D and tape group means at each site did not differ significantly, mean absolute (± SD) and root-mean square errors were low (e.g., WC, 3.4 ± 2.6 and 4.4 cm), and strong concordance correlations were present (0.90-0.99); bias with Bland-Altman analyses was small but significant ( < 0.001) for WC and WC/HC. Comparable results were observed for the four other circumferences. VAT was equally well-correlated with 3D and tape WC measurements ( s 0.70, 0.69, both < 0.001); comparable tape-3D VAT-WC/HC associations were also observed in males ( s, 0.85, 0.73, both < 0.001) and females ( s, 0.43, < 0.01; 0.73, < 0.001).
Digital anthropometry, with accessible technology such as the evaluated novel 3D app, has reached a sufficiently developed stage to go beyond body mass index for phenotyping patient's metabolic disease risks.
具备光学成像功能的智能手机应用程序（应用）正在改变人体测量学领域；在临床环境中对身体尺寸和形状进行数字测量变得越来越可行。目前可用的应用通常围绕二维图像的捕捉进行设计，然后通过应用程序软件将其转换为可用于数字人体测量的三维（3D）虚拟形象。本研究的目的是比较使用一款新型高精度3D智能手机应用评估的腰围（WC）、臀围（HC）、其他四个周长（右上臂/左上臂、大腿）以及WC/HC与经过培训的人体测量师用软尺进行的实际测量结果。
44名年龄在20 - 78岁、体重指数为18.5 - 48.5kg/m²的参与者完成了数字和手动周长评估以及用于测量内脏脂肪组织量（VAT）的双能X线吸收法。
3D数字测量与实际软尺测量的WC、HC和WC/HC估计值高度相关（r，0.90 - 0.97，P < 0.001），每个部位的3D测量均值与软尺测量均值无显著差异，平均绝对（±标准差）和均方根误差较低（例如，WC为3.4 ± 2.6和4.4cm），且存在强一致性相关性（0.
