摘要：Dolezal BA, Lau MJ, Abrazado M, Storer T, Cooper, CB. Validity of Two Commercial Grade Bioelectrical Impedance Analyzers for Measurement of Body Fat Percentage. JEPonline 2013;16(4):74-83. The purpose of this study was to validate the assessment of %Fat measured by two commercial grade BIA devices against the gold standard of dual x-ray absorptiometry (DEXA). Twenty-one subjects were measured for %Fat using three devices: an octopolar, multi-frequency BIA device (BIA8, BioSpace InBody R20); a quadripolar, single frequency BIA device (BIA4, Tanita BC-590BT); and a whole body DEXA (Hologic 4500). Mean ± SD differences in %Fat between the devices and DEXA were 0.14 ± 0.04 (P=0.80) (BIA8) and 1.77 ± 0.54 (P=0.76) (BIA4). Correlations with DEXA were r=0.98 (BIA8) and r=0.92 (BIA4). Bland-Altman analyses revealed a systematic bias for both BIA instruments vs. DEXA in which %Fat was underestimated in leaner subjects and overestimated in fatter subjects. All subjects had individual differences of ≤±3.0 %Fat for BIA8 vs. DEXA while 43% had differences of ≤3.0 %Fat for BIA4 vs. DEXA. Our data suggest that the use of an octopolar BIA device yields more than twice as many subjects within a ±3% error compared with BIA4; a value that might be considered appropriate for clinical use.
