Comparison of multifrequency bioelectrical impedance analysis with dual-energy X-ray absorptiometry for assessment of percentage body fat in a large, healthy population

摘要: Background: Bioelectrical impedance analysis (BIA) is widely usedinclinicsandresearchtomeasurebodycomposition.However, the results of BIA validation with reference methods are contradictory, and few data available on influence adiposity measurement body composition by BIA. Objective:The goal was to determine effects sex adiposityonthedifferenceinpercentagebodyfat(%BF)predictedbyBIA compared dual-energy X-ray absorptiometry (DXA). Design:Atotalof591healthysubjectswererecruitedinNewfoundland Labrador. %BF predicted using comparedwiththatmeasuredbyDXA.Methodsagreementwasassessed Pearson’s correlation Bland Altman analysis. Differences in among groups based were analyzed one-factor variance Bonferroni correction. Results: Correlations between DXA 0.88 for whole population, 0.78 men, 0.85 women. The mean determined (32.89 8.00%) significantly lower than that measured (34.72 8.66%). cutoffs specific. overestimated 3.03% 4.40% when 15% men 25% women, respectively, underestimated 4.32% 2.71% 33% respectively. Conclusions: a good alternative estimating subjects within normal fat range. tends overestimate lean underestimate obese subjects. Am J Clin Nutr 2005;81:74–8.