Skip Navigation LinksHome > July 2014 - Volume 46 - Issue 7 > Precision of the iDXA for Visceral Adipose Tissue Measuremen...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0000000000000238
SPECIAL COMMUNICATIONS: Methodological Advances

Precision of the iDXA for Visceral Adipose Tissue Measurement in Severely Obese Patients

CARVER, TAMARA E.1; COURT, OLIVIER2; CHRISTOU, NICOLAS V.2; REID, RYAN E. R.1; ANDERSEN, ROSS E.1

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Abstract

A new measurement tool, the automated software CoreScan, for the GE Lunar iDXA, has been validated for measuring visceral adipose tissue (VAT) against computed tomography in normal-weight populations. However, no study has evaluated the precision of CoreScan in measuring VAT among severely obese patients.

Purpose: The purpose of the study was to evaluate the precision of CoreScan for VAT measurements in severely obese adults (body mass index > 40 kg·m−2).

Methods: A total of 55 obese participants with a mean age of 46 ± 11 yr, body mass index of 49 ± 6 kg·m−2, and body mass of 137.3 ± 21.3 kg took part in this study. Two consecutive iDXA scans with repositioning of the total body were conducted for each participant. The coefficient of variation, the root-mean-square averages of SD of repeated measurements, the corresponding 95% least significant change, and intraclass correlations were calculated.

Results: Precision error was 8.77% (percent coefficient of variation), with a root-mean-square SD of 0.294 kg and an intraclass correlation of 0.96. Bland–Altman plots demonstrated a mean precision bias of −0.08 ± 0.41 kg, giving a coefficient of repeatability of 0.82 kg and a bias range of −0.890 to 0.725 kg.

Conclusions: When interpreting VAT results with the iDXA in severely obese populations, clinicians should be aware of the precision error for this important clinical parameter.

© 2014 American College of Sports Medicine

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