Reliability of Compartmental Body Composition Measures in Weight-Stable Adults Using GE iDXA: Implications for Research and Practice

Aimee L. Dordevic, Maxine Bonham, Ali Ghasem-Zadeh, Alison Evans, Elizabeth Barber, Kaitlin Day, Alastair Kwok, Helen Truby

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

The aim of this study was to explore the reliability and precision of body compartment measures, in particular visceral adipose tissue, in weight stable adults over a range of BMIs using GE-Lunar iDXA. Weight-stable participants aged 18⁻65 years had a total body composition scan on GE-Lunar iDXA either on three separate occasions over a three month period (n = 51), or on a single occasion for duplicate scans with repositioning (n = 30). The coefficient of variation (CV%) and least significant change (LSC) of body compartments were calculated. The CV was higher for all measures over three months (range 0.8⁻5.9%) compared with same-day precision-scans (all < 2%). The CV for visceral adipose tissue (VAT) was considerably higher than all other body compartments (42.2% three months, 16.2% same day scanning). To accurately measure VAT mass using the GE iDXA it is recommended that participants have a BMI ≥ 25 kg/m², or VAT mass > 500 g. Changes observed in VAT mass levels below 500 g should be interpreted with caution due to lack of precision and reliability. All other compartmental measures demonstrated good reliability, with less than 6% variation over three months.

Original languageEnglish
Article number1484
Number of pages14
JournalNutrients
Volume10
Issue number10
DOIs
Publication statusPublished - 12 Oct 2018

Keywords

  • adiposity
  • body composition
  • dual X-ray absorptiometry
  • visceral adipose tissue

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