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Alan J. McCubbin, Bethanie A. Allanson, Joanne N. Caldwell Odgers, Michelle M. Cort, Ricardo J.S. Costa, Gregory R. Cox, Siobhan T. Crawshay, Ben Desbrow, Eliza G. Freney, Stephanie K. Gaskell, David Hughes, Chris Irwin, Ollie Jay, Benita J. Lalor, Megan L.R. Ross, Gregory Shaw, Julien D. Périard and Louise M. Burke

reliable if not well rested and after recent large changes in fluid balance, or with intake of water-soluble vitamin supplements Urine specific gravity Simple for practitioners to operate provides quantitative result Equipment cost, some level of expertise required to operate, indirect measure, may not be

Open access

. Hydration status was assessed to determine if participants were euhydrated using urine specific gravity (Usg). Male specific prediction equations (Durnin and Womersley (D&W), Evans, Lohman, Reilly, Withers and Zemski) were selected to estimate %BF. Spearman’s correlation was used to assess the relationship

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Ricardo J.S. Costa, Beat Knechtle, Mark Tarnopolsky and Martin D. Hoffman

valuable as it results in plasma volume expansion. • Oliguria (limited urine output) is not necessarily a sign of dehydration. Avoid using urine measures of hydration (e.g., urine color, urine specific gravity, and urine osmolality) as a method of monitoring hydration status during ultramarathon running