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Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis.
Eur J Clin Nutr. 2005 Feb; 59(2):155-60.EJ

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/m(2) (ie not obese), 25 with BMI between 30.0 and 39.9 kg/m(2) (ie class I and II obese), and 25 with BMI between 40.0 and 48.2 kg/m(2) (ie class III obese).

METHODS

TBW and ECW were measured by (2)H(2)O 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 (RI(x)) was calculated as height (2)/R(x).

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, RI(500) 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, RI(5) 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/m(2). Eight-polar BIA offers accurate estimates of TBW and ECW in women with a wide range of BMI (19.1-48.2 kg/m(2)) without the need of population-specific formulae.

Authors+Show Affiliations

Malattie Metaboliche III e Laboratorio di Endocrinologia Sperimentale, Istituto Auxologico Italiano IRCCS, Piancavallo, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15340370

Citation

Sartorio, A, et al. "Body Water Distribution in Severe Obesity and Its Assessment From Eight-polar Bioelectrical Impedance Analysis." European Journal of Clinical Nutrition, vol. 59, no. 2, 2005, pp. 155-60.
Sartorio A, Malavolti M, Agosti F, et al. Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis. Eur J Clin Nutr. 2005;59(2):155-60.
Sartorio, A., Malavolti, M., Agosti, F., Marinone, P. G., Caiti, O., Battistini, N., & Bedogni, G. (2005). Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis. European Journal of Clinical Nutrition, 59(2), 155-60.
Sartorio A, et al. Body Water Distribution in Severe Obesity and Its Assessment From Eight-polar Bioelectrical Impedance Analysis. Eur J Clin Nutr. 2005;59(2):155-60. PubMed PMID: 15340370.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis. AU - Sartorio,A, AU - Malavolti,M, AU - Agosti,F, AU - Marinone,P G, AU - Caiti,O, AU - Battistini,N, AU - Bedogni,G, PY - 2004/9/2/pubmed PY - 2005/5/6/medline PY - 2004/9/2/entrez SP - 155 EP - 60 JF - European journal of clinical nutrition JO - Eur J Clin Nutr VL - 59 IS - 2 N2 - 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/m(2) (ie not obese), 25 with BMI between 30.0 and 39.9 kg/m(2) (ie class I and II obese), and 25 with BMI between 40.0 and 48.2 kg/m(2) (ie class III obese). METHODS: TBW and ECW were measured by (2)H(2)O 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 (RI(x)) was calculated as height (2)/R(x). 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, RI(500) 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, RI(5) 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/m(2). Eight-polar BIA offers accurate estimates of TBW and ECW in women with a wide range of BMI (19.1-48.2 kg/m(2)) without the need of population-specific formulae. SN - 0954-3007 UR - https://www.unboundmedicine.com/medline/citation/15340370/Body_water_distribution_in_severe_obesity_and_its_assessment_from_eight_polar_bioelectrical_impedance_analysis_ L2 - https://doi.org/10.1038/sj.ejcn.1602049 DB - PRIME DP - Unbound Medicine ER -