Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in severely obese Caucasian children and adolescents

Stefano Lazzer, Giorgio Bedogni, Fiorenza Agosti, Alessandra De Col, Daniela Mornati, Alessandro Sartorio

Research output: Contribution to journalArticle

Abstract

The objectives of the present study were to compare body composition assessed by dual-energy X-ray absorptiometry (DXA), air displacement plethysmography (ADP) and bioelectrical impedance analysis (BIA) in severely obese Caucasian children and adolescents and to develop and validate new equations for predicting body composition from BIA using DXA as the reference method. Body composition was assessed in fifty-eight obese children and adolescents (BMI 34.4 (SD 4.9) kg/m2) aged 10-17 years by DXA, ADP and BIA. ADP body fat content was estimated from body density using equations devised by Siri (ADPSiri) and Lohman (ADPLohman). In the whole sample, the Bland-Altman test showed that ADPSiri and ADPLohman underestimated percentage fat mass (%FM) by 2.1 (SD 3.4) and by 3.8 (SD 3.3) percent units ( P2/body impedance)+3.1) was developed on the pooled sample and cross-validated on an external group of sixty-one obese children and adolescents. The difference between predicted and measured FFM in the external group was -1.6 (SD 2.9) kg ( P

Original languageEnglish
Pages (from-to)918-924
Number of pages7
JournalBritish Journal of Nutrition
Volume100
Issue number4
DOIs
Publication statusPublished - 2008

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Keywords

  • Air displacement plethysmography
  • Bioelectrical impedance analysis
  • Body fat
  • Dual-energy X-ray absorptiometry
  • Fat-free mass
  • Obesity

ASJC Scopus subject areas

  • Medicine (miscellaneous)

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