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

2018-10-12

Dordevic, Aimee L

Bonham, Maxine

Ghasem-Zadeh, Ali

Evans, Alison

Barber, Elizabeth

Day, Kaitlin

Kwok, Alastair

Truby, Helen

adiposity

body composition

dual X-ray absorptiometry

visceral adipose tissue

Journal Article

0000-0002-0405-3164

0000-0003-3846-8568

0000-0002-1992-1649

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10.3390/nu10101484

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.

link

Nutrients 2018; 10(10): E1484

Nutrients