Comparison of DXA and BIA in obese women indicated a sleeve gastrectomy – pilot study

Czech version

Authors: V. Zavadilová; M. Bužga; Z. Jirák; A. Chroboková
Authors‘ workplace: Ostravská univerzita v Ostravě, Lékařská fakulta, Děkan: doc. MUDr. Arnošt Martínek, CSc., Ústav fyziologie, Vedoucí: doc. RNDr. Pavol Švorc, CSc.
Published in: Prakt. Lék. 2011; 91(12): 723-726
Category: Of different specialties

Overview

Introduction:
Measurement of body fat is very important for assessing the severity of obesity, monitoring the effectiveness of its treatment and for motivating patients. There are various methods of body composition measurement that differ in accuracy, cost and time demands.

Methods:
The aim of this study was to compare body fat measured by Dual X-Ray Absorptiometry (DXA, device Hologic Discovery W) and by Bioelectrical Impedance Analysis (BIA, the device Nutriguard M) in obese women with indicated sleeve gastrectomy. The investigated individuals underwent

body weight,
height,
waist, and
hip measurement

and their BMI was calculated. A correction equation for the conversion of body fat percentage determined by BIA was created from selected monitored parameters, so that the results of this method were comparable to the results of the DXA reference method.

Results:
The sample consisted of 67 women aged 27 to 68 years. Average BMI was 42.3 ± 5.6 kg/m². Subjects average amount of fat was 48.8 ± 4 % (DXA). Fat determined by BIA was on average 3.8 % lower (p <0.001). The correction formula for the conversion of body fat percentage observed by BIA, correlated with the method of DXA (r = 0,791 and showed on average, the same results in surveyed subjects as the method of DXA (p = 0.808).

Conclusion:
The results of body fat obtained by BIA in obese women were on average 3.8 % lower when compared with the DXA method. A correction equation for the conversion of body fat percentage determined by BIA and DXA was created. The correction equation created for this group of women gave the same results in body fat percentage as the DXA reference method.

Key words:
bioelectrical impedance analysis, DXA, sleeve gastrectomy, body composition, body fat percentage.

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