Body fat percentage is an important component of body composition. Obtaining accurate body fat percentage in relation to total body mass can be difficult, costly, and inaccessible. A Multi-frequency bioelectrical impedance analyzer (BIA) provides a cost efficient and mobile instrument that has the capability to be used on a variety of populations. PURPOSE: This aim was to evaluate the relation between body fat percentages determined by dual-energy x-ray absorptiometry (DXA) vs BIA. METHODS: Ninety six (96) recreationally active individuals (63 male, 33 female) completed a 12 hour fast, refrained from exercise for a minimum of 12 hours, and alcohol consumption 24 hours prior to testing. After anthropometric measures were assessed subjects body fat percentage was determined from DXA and BIA subsequently. Each participant completed both body composition assessments in one visit to the Human Performance Laboratory. Pearson’s correlations were run for fat tissue percentage from DXA percent body fat determined from BIA. RESULTS: Subjects’ mean age, height (cm), and weight (kg) were 20.72±2yrs, 174.66±10.09cm, and 76.94±17.76kg, respectively. Body fat percentages between the DXA (25.61±10.56%) and BIA (20.99±9.34%) were significantly related (r = .94, p<.0001). Body fat percentage determined by DXA shares 88% of the variance by BIA leaving 12% variance unexplained. CONCLUSION: The results of the current study reveals if strict guidelines are adhered to that multi-frequency BIA is a valid method to determine body fat percentage compare to DXA.
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Miller et al. (2016) studied this question.