Body Composition Assessment: A Comparison of the Bod Pod, InBody 770, and DXA
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Keywords
Fat mass, Fat-free mass, Lean body mass
Abstract
Introduction: There are several laboratory methods for assessing body composition. The purpose of this study was to compare three body composition methods in a cohort of exercise-trained men and women: air displacement plethysmography (Bod Pod®), dual energy x-ray absorptiometry (DXA) and a multi-frequency bioelectrical impedance (MF-BIA) device (InBody® 770). Methods: Subjects (n=155; 42 male, 113 female) came to the laboratory for body composition assessment (i.e., percent body fat, fat-free mass and fat mass). Results: There were no statistically significant differences between the Bod Pod and InBody for any measure of body composition. However, the Bod Pod and Inbody 770 overestimated fat-free mass and underestimated fat mass and percent body fat in comparison to the DXA.
Conclusions: In general, the Bod Pod and InBody 770 underestimate percent body fat versus the DXA. Thus, one must be cautious in the interpretation of body composition data depending on the method of assessment. It should be noted that all three methods are acceptable for body composition analysis.
References
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