Bioelectrical impedance analysis for predicting body composition: what about the external validity of new regression equations?
Autor: | Corinna Koebnick, H.-J. Franz Zunft, Ulrike Trippo, Holle Greil |
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Rok vydání: | 2004 |
Předmět: | |
Zdroj: | The American Journal of Clinical Nutrition. 79:335-336 |
ISSN: | 0002-9165 |
DOI: | 10.1093/ajcn/79.2.335 |
Popis: | In a recent issue of the Journal, Sun et al (1) emphasized the importance of bioelectrical impedance analysis (BIA) for large-scale epidemiologic studies. In their well-designed and detailed investigation, the authors combined several methods to assess different body compartments in 1474 whites and 355 blacks. In a multistep procedure, they used these results to develop a model for predicting total body water and fat-free mass (FFM) from BIA resistance. First, total body fat was calculated by using body weight, body volume derived from hydrostatic weighing, total body water calculated with the deuterium dilution method, and total-body bone mineral content determined with dual-energy X-ray absorptiometry (DXA). Second, in a regression analysis, these data were used to develop preliminary equations for calculating FFM from BIA resistance. After cross-validation, final equations were derived that were fitted to FFM calculated from the multicompartment model with a very high precision ( |
Databáze: | OpenAIRE |
Externí odkaz: |
Abstrakt: | In a recent issue of the Journal, Sun et al (1) emphasized the importance of bioelectrical impedance analysis (BIA) for large-scale epidemiologic studies. In their well-designed and detailed investigation, the authors combined several methods to assess different body compartments in 1474 whites and 355 blacks. In a multistep procedure, they used these results to develop a model for predicting total body water and fat-free mass (FFM) from BIA resistance. First, total body fat was calculated by using body weight, body volume derived from hydrostatic weighing, total body water calculated with the deuterium dilution method, and total-body bone mineral content determined with dual-energy X-ray absorptiometry (DXA). Second, in a regression analysis, these data were used to develop preliminary equations for calculating FFM from BIA resistance. After cross-validation, final equations were derived that were fitted to FFM calculated from the multicompartment model with a very high precision ( |
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ISSN: | 00029165 |
DOI: | 10.1093/ajcn/79.2.335 |