title: Bioimpedance in 7-year-old children: validation by dual X-ray absorptiometry - part 2: assessment of segmental composition.
abstract: OBJECTIVE
  Segmental body composition in children was assessed using the bioimpedance analyzer (BIA) TANITA BC-418 and compared with dual-energy X-ray absorptiometry (DXA) values.
  
  
  METHODS
  A cross-sectional validation study in which 7-year-old children from the Spanish subsample of the EU Childhood Obesity Project were assessed through anthropometry, BIA and DXA. Main outcome measures were fat and lean masses of the trunk, left arm and left leg (in kg) assessed through BIA direct outputs (BIAoutputs) and DXA. Predictive equations for the composition of each segment were derived from raw impedance and anthropometric measurements; results obtained from these predictive equations (BIAregressions) were also compared to DXA.
  
  
  RESULTS
  One hundred seventy-one (84 boys) 7-year-old children were studied. BIAoutputs and DXA results showed small differences for leg lean mass (6.5%) and high differences for trunk fat and trunk lean masses (>30%). BIAregressions results showed differences of about 20% for trunk fat mass, 1.5% for trunk lean mass and 3.7% for leg lean mass compared to DXA.
  
  
  CONCLUSIONS
  Segmental body composition measures predicted by internal algorithms of the TANITA BC-418 were not valid for clinical or epidemiological use, except for leg lean mass. The assessment of segmental composition was improved using our own predictive equations combining segmental-specific anthropometric measurements with segmental impedances.
authors.affiliation: Universitat Rovira i Virgili, Institut d'Investigació Sanitària Pere Virgili, Reus, Spain.
authors.forename: Veronica
authors.initials: V
authors.lastname: Luque
authors.forename: Joaquin
authors.initials: J
authors.lastname: Escribano
authors.forename: Marta
authors.initials: M
authors.lastname: Zaragoza-Jordana
authors.forename: Carmen
authors.initials: C
authors.lastname: Rubio-Torrents
authors.forename: Natalia
authors.initials: N
authors.lastname: Ferré
authors.forename: Mariona
authors.initials: M
authors.lastname: Gispert-Llaurado
authors.forename: Ricardo
authors.initials: R
authors.lastname: Closa-Monasterolo
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D000273:Adipose Tissue; D001823:Body Composition; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D063766:Pediatric Obesity / Q000453:epidemiology*; D044465:White People