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dc.contributor.authorStewart, Ian B
dc.contributor.authorDias, Brittany
dc.contributor.authorBorg, David N
dc.contributor.authorBach, Aaron JE
dc.contributor.authorFeigl, Beatrix
dc.contributor.authorCostello, Joseph T
dc.date.accessioned2019-12-04T00:47:16Z
dc.date.available2019-12-04T00:47:16Z
dc.date.issued2017
dc.identifier.issn1664-042X
dc.identifier.doi10.3389/fphys.2017.00036
dc.identifier.urihttp://hdl.handle.net/10072/389473
dc.description.abstractCurrent hydration assessments involve biological fluids that are either compromised in dehydrated individuals or require laboratory equipment, making timely results unfeasible. The eye has been proposed as a potential site to provide a field-based hydration measure. The present study evaluated the efficacy and sensitivity of intraocular pressure (IOP) to assess hydration status. Twelve healthy males undertook two 150 min walking trials in 40°C 20% relative humidity. One trial matched fluid intake to body mass loss (control, CON) and the other had fluid restricted (dehydrated, DEH). IOP (rebound tonometry) and hydration status (nude body mass and serum osmolality) were determined every 30 min. Body mass and serum osmolality were significantly (p < 0.05) different between trials at all-time points following baseline. Body mass losses reached 2.5 ± 0.2% and serum osmolality 299 ± 5 mOsmol.kg−1 in DEH. A significant trial by time interaction was observed for IOP (p = 0.042), indicating that over the duration of the trials IOP declined to a greater extent in the DEH compared with the CON trial. Compared with baseline measurements IOP was reduced during DEH (150 min: −2.7 ± 1.9 mm Hg; p < 0.05) but remained stable in CON (150 min: −0.3 ± 2.4 mm Hg). However, using an IOP value of 13.2 mm Hg to predict a 2% body mass loss resulted in only 57% of the data being correctly classified (sensitivity 55% and specificity 57%). The use of ΔIOP (−2.4 mm Hg) marginally improved the predictive ability with 77% of the data correctly classified (sensitivity: 55%; specificity: 81%). The present study provides evidence that the large inter-individual variability in baseline IOP and in the IOP response to progressive dehydration, prevents the use of IOP as an acute single assessment marker of hydration status.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherFrontiers Research Foundation
dc.publisher.placeSwitzerland
dc.relation.ispartofpagefrom36: 1
dc.relation.ispartofpageto36: 8
dc.relation.ispartofjournalFrontiers in Physiology
dc.relation.ispartofvolume8
dc.subject.fieldofresearchMedical Physiology
dc.subject.fieldofresearchPhysiology
dc.subject.fieldofresearchPsychology
dc.subject.fieldofresearchcode1116
dc.subject.fieldofresearchcode0606
dc.subject.fieldofresearchcode1701
dc.titleIntraocular Pressure Is a Poor Predictor of Hydration Status following Intermittent Exercise in the Heat
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationStewart, IB; Dias, B; Borg, DN; Bach, AJE; Feigl, B; Costello, JT, Intraocular Pressure Is a Poor Predictor of Hydration Status following Intermittent Exercise in the Heat, Frontiers in Physiology, 2017, 8, pp. 36: 1-36: 8
dc.date.updated2019-12-02T23:35:37Z
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2017 Stewart, Dias, Borg, Bach, Feigl and Costello. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
gro.hasfulltextFull Text
gro.griffith.authorBorg, David
gro.griffith.authorBach, Aaron J.


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