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Assessment of fat mass and fat-free mass in Portuguese adults: calibration of single-frequency leg-to-leg bioelectrical impedance with dual-energy x-ray absorptiometry

2026-01Artigo de investigação Acesso embargado
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dc.contributor.authorFarias, Fernanda
dc.contributor.authorSevero, Milton
dc.contributor.authorRamos, Elisabete
dc.contributor.authorLopes, Carla
dc.contributor.authorNogueira, Luísa
dc.contributor.authorAraújo, Joana
dc.contributor.authorNogueira, Luisa
dc.date.accessioned2026-05-29T14:21:28Z
dc.date.available2026-05-29T14:21:28Z
dc.date.issued2026-01
dc.description.abstractBioelectrical impedance analysis (BIA) is more commonly employed in outpatient evaluations and epidemiological studies as it is cheaper and less time-consuming. Therefore, we aimed to compare fat mass (FM) and fat-free mass (FFM) estimated by BIA and dual-energy x-ray absorptiometry (DXA) in Portuguese adults, and to calibrate BIA estimates. We analyzed data from two population-based cohorts: EPIPorto (n = 391; <65 y) and EPITeen (n = 973; 27 y). Both completed single-frequency leg-to-leg BIA (Tanita TBF-300) and DXA (QDR 4500A Hologic). Agreement between BIA and DXA (FM/FFM) was evaluated by Bland and Altman. To calibrate the BIA estimates, the coefficients were estimated by linear regression using univariate (FM or FFM, separately) and multivariate models (FM and FFM in the same model). The correlation between BIA and DXA was high for FFM and for FM (FFM: r = 0.946/r = 0.954; FM: r = 0.926/r = 0.921, for EPIPorto and EPITeen, respectively). However, BIA underestimated FM (19.4% EPIPorto; 24.3% EPITeen) and overestimated FFM (11.3% EPIPorto; 14.4% EPITeen). Using the multivariate constrained model to have an absolute equal intercept for FFM and FM, the following calibration equations for BIA measurements were obtained for EPIPorto: FFMcalibrated =-5.119 + 0.995 £ FFMBIA;FMcalibrated = +5.119 + 0.980 £ FMBIA; and for EPITeen: FFMcalibrated =-5.707 + 0.984 £ FFMBIA;FMcalibrated = +5.707 + 0.975 £ FMBIA. FM assessed by single-frequency leg-to-leg BIA was largely underestimated and FFM overestimated in comparison to DXA, suggesting the use of BIA model-specific calibration equations to calibrate FM and FFMestimates in clinical settings and research studies.eng
dc.description.sponsorshipCEECIND/01271/2018
dc.identifier.citationFarias, F., Severo, M., Ramos, E., Lopes, C., Nogueira, L., & Araújo, J. (2026). Assessment of fat mass and fat-free mass in Portuguese adults: Calibration of single-frequency leg-to-leg bioelectrical impedance with dual-energy x-ray absorptiometry. Nutrition, 141, 112926. https://doi.org/10.1016/j.nut.2025.112926
dc.identifier.doi10.1016/j.nut.2025.112926
dc.identifier.eissn1873-1244
dc.identifier.eissn1873-1244
dc.identifier.urihttp://hdl.handle.net/10400.22/32471
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationUIDB/04750/2020; 2022.11852.BD
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0899900725002448
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBioelectrical impedance
dc.subjectAbsorptiometry
dc.subjectAdults
dc.subjectCalibration
dc.subjectBody composition
dc.titleAssessment of fat mass and fat-free mass in Portuguese adults: calibration of single-frequency leg-to-leg bioelectrical impedance with dual-energy x-ray absorptiometryeng
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.titleNutrition
oaire.citation.volume141
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameNogueira
person.givenNameLuisa
person.identifier.orcid0000-0002-1291-9490
relation.isAuthorOfPublicationc2991b07-7696-4d2b-ad5d-863790e33130
relation.isAuthorOfPublication.latestForDiscoveryc2991b07-7696-4d2b-ad5d-863790e33130

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