Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2004-09-01

AUTHORS

A Sartorio, M Malavolti, F Agosti, P G Marinone, O Caiti, N Battistini, G Bedogni

ABSTRACT

Objective: To measure body water distribution and to evaluate the accuracy of eight-polar bioelectrical impedance analysis (BIA) for the assessment of total body water (TBW) and extracellular water (ECW) in severe obesity.Design: Cross-sectional study.Setting: Obesity clinic.Subjects: In all, 75 women aged 18–66 y, 25 with body mass index (BMI) between 19.1 and 29.9 kg/m2 (ie not obese), 25 with BMI between 30.0 and 39.9 kg/m2 (ie class I and II obese), and 25 with BMI between 40.0 and 48.2 kg/m2 (ie class III obese).Methods: TBW and ECW were measured by 2H2O and Br dilution. Body resistance (R) was obtained by summing the resistances of arms, trunk and legs as measured by eight-polar BIA (InBody 3.0, Biospace, Seoul, Korea). The resistance index at a frequency of x kHz (RIx) was calculated as height 2/Rx.Results: ECW : TBW was similar in women with class III (46±3%, mean±s.d.) and class I–II obesity (45±3%) but higher than in nonobese women (39±3%, P<0.05). In a random subsample of 37 subjects, RI500 explained 82% of TBW variance (P<0.0001) and cross-validation of the obtained algorithm in the remaining 38 subjects gave a percent root mean square error (RMSE%) of 5% and a pure error (PE) of 2.1 l. In the same subjects, RI5 explained 87% of ECW variance (P<0.0001) and cross-validation of the obtained algorithm gave a RMSE% of 8% and a PE of 1.4 l. The contribution of weight and BMI to the prediction of TBW and ECW was nil or negligible on practical grounds.Conclusions: ECW : TBW is similar in women with class I–II and class III obesity up to BMI values of 48.2 kg/m2. Eight-polar BIA offers accurate estimates of TBW and ECW in women with a wide range of BMI (19.1–48.2 kg/m2) without the need of population-specific formulae.Sponsorship: Progetti di Ricerca Corrente, Istituto Auxologico Italiano. More... »

PAGES

155-160

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/sj.ejcn.1602049

DOI

http://dx.doi.org/10.1038/sj.ejcn.1602049

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037953040

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15340370


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