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Euhydrated body mass was recorded. Participants consumed 1L (250\u00a0ml every 15\u00a0min) of water, fruit juice, a sports drink or low-fat milk in a randomized cross-over design. Urine and blood samples were obtained before and after the drinking period and every hour thereafter for 3-h. Samples were used to determine osmolality, electrolytes (Na<jats:sup>+<\/jats:sup> and K<jats:sup>+<\/jats:sup>), water clearance, and glomerular filtration rate.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Free water clearance was significantly higher in Young than Older at 1 and 2\u00a0h after the ingestion of W and S (p\u2009&lt;\u20090.05). Net Na<jats:sup>+<\/jats:sup> and K<jats:sup>+<\/jats:sup> balance were not different between Young and Older (p\u2009=\u20090.91 and p\u2009=\u20090.65) adults, respectively. At 3\u00a0h Na<jats:sup>+<\/jats:sup> balance was negative after ingesting water and fruit juice, but neutral after sport drink and milk. Net K<jats:sup>+<\/jats:sup> balance was neutral at 3\u00a0h after ingesting milk, but negative after water, fruit juice and sport drink.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Milk was retained longer than other beverages in Young, but not in Older, despite similar net electrolyte balance responses. Older had higher fluid retention in the first 2\u00a0h after the ingestion of all beverages, except for milk when compared to Young, indicating an age-related loss of ability to regulate fluid balance under current study conditions.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00421-023-05241-0","type":"journal-article","created":{"date-parts":[[2023,6,9]],"date-time":"2023-06-09T15:02:22Z","timestamp":1686322942000},"page":"2331-2340","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["A randomised trial to assess fluid and electrolyte balance responses following ingestion of different beverages in young and older men"],"prefix":"10.1007","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3960-5704","authenticated-orcid":false,"given":"Nidia","family":"Rodriguez-Sanchez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1622-3044","authenticated-orcid":false,"given":"Stuart D. 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