Poster Topical Area: Obesity
Location: Hall D
Poster Board Number: 739
Objective: Accurate measures of body composition are often expensive to acquire and may require ionizing radiation. Bioimpedance analysis (BIA) devices offer a safe, inexpensive, and rapid method for predicting body composition. Standing BIA devices for application in research settings range from large 8-electrode devices to heavy duty mobile 4-electrode systems. The current study aims to compare the accuracy of two different BIA systems (Tanita Corp, Tokyo, Japan): the upright MC-980Uplus which is a stationary 8-electrode system that operates with six frequencies; and the DC-430U which is a potentially portable 4-electrode BIA system that operates with two frequencies.
Method: A sample of 77 subjects (41 female) completed measures of height, weight, dual-energy X-ray absorptiometry (DXA, Hologic Discovery A) weight and %fat, and BIA system weight and %fat. Subjects ranged in age from 18-76 years and BMI from 16.5-40.8 kg/m2. Linear regression and Bland-Altman analyses were used to determine correlations and biases of the BIA systems in reference to DXA.
Results: Both the DC-430U and the MC-980Uplus weight measurements were highly correlated with DXA total body mass (r=0.99, p2 for the DC-430U correlation with DXA was lower but still good (r=0.89, p<0.0001). Bland-Altman analyses revealed non-significant slopes for both BIA devices with a small bias of 4.4% and 3.8% lower for the DC-430U and MC-980Uplus, respectively.
Conclusion: The small, portable heavy duty DC-430U BIA system offers a potentially research grade body composition device that can be used in settings with limited resources and in studies that do not require extensive regional measurements as provided by DXA and the 8-electrodue MC-980Uplus systems.
This work was partially supported by two National Institutes of Health NORC Center Grants P30DK072476, Pennington/Louisiana; and P30DK040561, Harvard; and R01DK109008, Shape UP! Adults.
Pennington Biomedical Research Center, Louisiana State University
Baton Rouge, Louisiana