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Med Sci Sports Exerc. 2014 Jul;46(7):1462-5. doi: 10.1249/MSS.0000000000000238.

Precision of the iDXA for visceral adipose tissue measurement in severely obese patients.

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1
1Department of Kinesiology and Physical Education, McGill University, Montreal, QC, CANADA; and 2Bariatric Surgery, McGill University Health Center, Montreal, QC, CANADA.

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.

PMID:
24389525
DOI:
10.1249/MSS.0000000000000238
[Indexed for MEDLINE]
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