title: Ability of new octapolar bioimpedance spectroscopy analyzers to predict 4-component-model percentage body fat in Hispanic, black, and white adults.
abstract: BACKGROUND
  New, vertical, 8-electrode bioimpedance spectroscopy (BIS) analyzers provide detailed body-composition and nutritional information within 2 min. This is the first report on BIS's accuracy in predicting relative fatness [percentage body fat (%BF)] in a heterogeneous sample according to a multicomponent model criterion.
  
  
  OBJECTIVE
  We compared %BF measurements from 2 BIS devices with those from a multicomponent model in a sample of Hispanic, black, and white adults.
  
  
  METHODS
  Equal numbers of apparently healthy men and women (n = 75 of each) from each racial-ethnic group, diverse in body mass index and age, volunteered. Reference %BF (%BF(4C)) was computed by using a 4-component (4C) model with total bone mineral content obtained from dual-energy X-ray absorptiometry, body density from underwater weighing with measured residual lung volume, and total body water from traditional BIS. Estimations from InBody 720 (%BF(720)) and InBody 320 (%BF(320)) BIS analyzers were validated against %BF(4C).
  
  
  RESULTS
  The %BF(720) (r = 0.85, SEE = 5.19%BF) and %BF(320) (r = 0.84, SEE = 5.17%BF) correlations were significant (P < 0.05) in the men; main effects were nonsignificant. Correlations for %BF(720) (r = 0.88, SEE = 4.85%BF) and %BF(320) (r = 0.89, SEE = 4.82%BF) also were significant in the women (P < 0.05); there was a main effect for method but not race-ethnicity. There were no sex-specific overestimations or underestimations at the extremes of the distributions.
  
  
  CONCLUSIONS
  BIS estimates of %BF(4C) were well correlated in men and women. There were no significant methodologic differences in the men. The %BF(4C) was significantly underestimated by %BF(720) and %BF(320) in the women.
authors.affiliation: Human Performance and Leisure Sciences/Sport and Exercise Sciences, Barry University, Miami Shores, FL 33161-6695, USA. agibson@mail.barry.edu
authors.forename: Ann L
authors.initials: AL
authors.lastname: Gibson
authors.forename: Jason C
authors.initials: JC
authors.lastname: Holmes
authors.forename: Richard L
authors.initials: RL
authors.lastname: Desautels
authors.forename: Lyndsay B
authors.initials: LB
authors.lastname: Edmonds
authors.forename: Laura
authors.initials: L
authors.lastname: Nuudi
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue; D000328:Adult; D001741:Black or African American; D000368:Aged; D000369:Aged, 80 and over; D001823:Body Composition; D015992:Body Mass Index; D017097:Electric Impedance; D005260:Female; D006630:Hispanic or Latino; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012737:Sex Factors; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods; D044465:White People