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Association between sodium excretion and hydration status by Free Water Reserve: a cross-sectional analysis in adolescents

2015Journal article Open access
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dc.contributor.authorGonçalves, Carla
dc.contributor.authorAbreu, Sandra
dc.contributor.authorPadrão, Patrícia
dc.contributor.authorPinho, Olívia
dc.contributor.authorGraça, Pedro
dc.contributor.authorBreda, João
dc.contributor.authorSantos, Rute
dc.contributor.authorMoreira, Pedro
dc.date.accessioned2015-10-09T14:50:21Z
dc.date.available2015-10-09T14:50:21Z
dc.date.issued2015
dc.description.abstractBackground: Excessive sodium intake is excreted through urine and could affect hydration status. This study aims to describe hydration status in adolescents and to assess the association between hydration status by free water reserve (FWR) and urinary sodium excretion. Methods: Two hundred participants (118 girls), aged 13–18 years completed the study. Median urinary sodium excretion was measured in one 24-hour collection and was used as a proxy for sodium intake. FWR (measured urine volume minus the obligatory urine volume) was used for characterization of hydration status, and linear regression models were used to evaluate the association between urinary sodium excretion and FWR, adjusted for water and energy intake in boys and carbohydrate, fiber, and water intake in girls. Results: The participants median urinary sodium excretion was 3645.5 mg/d for boys and 2702.5 mg/d for girls (p < 0.001). Median FWR was positive in both sex groups; however, 40.2 % of boys and 31.4 % of girls (p = 0.195) were at risk of hypo-hydration status. Linear regression models showed that urinary sodium excretion was a significant predictor of FWR for both sexes (Crude Model β = 0.114, p = 0.003 for boys and β = 0.160, p < 0.001 for girls; Adjusted Model β = 0.120, p = 0.002 for boys and β = 0.142, p < 0.001 for girls). Conclusions: Nearly one third of subjects were at risk of hypo-hydration. Higher sodium excretion was associated with a better hydration status obtained by FWR. However, as the majority of subjects consume sodium above recommendations, preventive measures to promote better hydration status should focus in increasing the level of total water intake.pt_PT
dc.description.sponsorshipBPD/102381/2014
dc.identifier.doiDOI 10.1186/s40795-015-0013-y
dc.identifier.urihttp://hdl.handle.net/10400.26/9901
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherBioMedCentralpt_PT
dc.relation.publisherversionhttp://www.biomedcentral.com/2055-0928/1/17pt_PT
dc.subjectSalpt_PT
dc.subjectAlimentaçãopt_PT
dc.subjectNutriçãopt_PT
dc.subjectAdolescênciapt_PT
dc.titleAssociation between sodium excretion and hydration status by Free Water Reserve: a cross-sectional analysis in adolescentspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FDES%2F116586%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/COMPETE/PTDC%2FDES%2F116586%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FDTP%2F00617%2F2013/PT
oaire.citation.titleBMC Nutritionpt_PT
oaire.citation.volume1pt_PT
oaire.fundingStream5876-PPCDTI
oaire.fundingStreamCOMPETE
oaire.fundingStream5876
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublication589e5f3b-5a25-4c80-998e-c328a136857a
relation.isProjectOfPublication3117c361-ebb6-4b29-9d90-13ae15443671
relation.isProjectOfPublication84b0e30f-a297-49bb-814c-f014f3c40e21
relation.isProjectOfPublication.latestForDiscovery589e5f3b-5a25-4c80-998e-c328a136857a

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