Abstract：
BACKGROUND:Validated equations for body composition analysis using bioelectrical impedance (BIA) in morbidly obese (MO) subjects are scarce. Thus, our aim was todevelop new equations from physical and BIA parameters to estimate whole-body and segmental body composition inMO subjects, with dual-energy X-ray absorptiometry(DXA) as the reference method. METHODS:A cross-sectional study on 159 Caucasian MO subjects (female 78%, age 43.5 ± 11.8 years, BMI 45.6 ± 4.9 kg/m2) divided in two groups was conducted: model building cohort (n = 110) and model validation cohort (n 0 49). Stepwise regression analysis was used to develop specific fat free mass (FFM) and fat mass (FM) equations. RESULTS:Gender, body weight, and height2/impedance accounted, respectively, for 89.4% (p < 0.001) and 89.3% (p < 0.001) of the variability of DXA-total FFM in the two cohorts. Using the new equation, the mean difference between the DXA-FFM and BIA-FFM estimates was +0.180 kg (95% CI: -0.34 to +0.7 kg, p 0 NS), and the resulting limits of agreement were +6.76 and −6.40 kg. Similarly, good estimates of DXA truncal-, android-, and gynoid-FM from anthropometric and BIA parameters could be obtained from weight, height2/impedance, and waist and hip circumferences (respectively, R2 adjusted: 0.657, 0.776, and 0.770; p < 0.001). CONCLUSIONS:The new equations derived from physical and BIA parameters provide accurate estimates of body composition in MO subjects.
journal_name
Obes Surgjournal_title
Obesity surgeryauthors
Jiménez A,Omaña W,Flores L,Coves MJ,Bellido D,Perea V,Vidal Jdoi
10.1007/s11695-011-0570-3subject
Has Abstractpub_date
2012-04-01 00:00:00pages
587-93issue
4eissn
0960-8923issn
1708-0428journal_volume
22pub_type
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