Plethysmographic and anthropometric validation of a 3D body image digitizer to determine body dimensions

Image digitizing has facilitated body shape evaluation gained entry in ergonomics industry, in fashion and in health. Objective: to validate the 3D image digitizer (TC2-18) to determine body dimensions in a fast and reliable manner. Methods: 285 adults of both sexes were studied to measure anthropometrics, plethysmography, and digitized body shape. Results: Digitizer obtained measurements highly correlated with those obtained through anthropometrics and plethysmography (R2 ≥ 0.75). However, the TC2-18 gave lower values in total body volume when compared with plethysmography (CI 95%, −3.9 to −3.5 L). In contrast, the TC2-18 yielded higher values in mesosternal (CI 95%, 8.8–9.6 cm), neck (CI 95%, 2.6–3.0 cm), gluteus maximus (CI 95%, 3.1–3.7 cm), relaxed arm (CI 95%, 2.9–3.3 cm), and minimal waist (CI 95%, 3.1–3.7 cm) circumferences; as well as similar data for the upper thigh, calf and forearm circumference. Conclusion: TC2-18 3D digitizer yielded valid and reliable measures when adult persons are evaluated. Found differences occur due to movement during digitizing and by difference inherent to the used devices. •An equation for the calculation of body volume by digitization is proposed.•A 3D digitizer is validated for anthropometric measurements.•Body movements should be avoided during digitization.