| Urine color, osmolality and specific electrical conductance are not accurate measures of hydration status during postexercise rehydration. | |
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MedLine Citation:
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PMID: 10230169 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: The aim of the study was to determine whether urine color, osmolality and specific electrical conductance (SEC) provide an accurate index of hydration status and of fluid requirements during the recovery phase after an acute exercise-induced dehydration. METHODS: Experimental design: eight well-trained healthy males were dehydrated about 3% of body mass, 3 times, by cycling in the heat. To rehydrate after exercise, three types of drinks frequently consumed by athletes postexercise, i.e. a caffeinated soft drink (CC), a mineral water (MW), or a carbohydrate-electrolyte solution (CES) were ingested ad libitum and in randomized cross-over design during the first 2 hrs of an observation period lasting 6 hrs. Measures: urine was sampled each hour for determination of color, osmolality and SEC. Net rehydration was calculated from fluid intake and fluid loss by sweat and urine. RESULTS: Fluid intake amounted 2.6 +/- 0.2 kg for CC, 2.2 +/- 0.2 kg for MW and 2.8 +/- 0.3 kg for CES representing 116%, 96% and 127% of fluid lost by sweat. Urine output showed a negative correlation with color, osmolality and SEC (p < 0.001). These variables were highly interrelated (p < 0.001). However, the level of rehydration did not correlate with any of the measured urinary variables (p > 0.05). CONCLUSIONS: Urine color, SEC and osmolality are poor indicators of hydration status measured from the balance between fluid intake and urine output up to 6 hrs postexercise. |
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Authors:
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E M Kovacs; J M Senden; F Brouns |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of sports medicine and physical fitness Volume: 39 ISSN: 0022-4707 ISO Abbreviation: J Sports Med Phys Fitness Publication Date: 1999 Mar |
Date Detail:
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Created Date: 1999-05-19 Completed Date: 1999-05-19 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376337 Medline TA: J Sports Med Phys Fitness Country: ITALY |
Other Details:
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Languages: eng Pagination: 47-53 Citation Subset: IM |
Affiliation:
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Department of Human Biology, Maastricht University, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cross-Over Studies Dehydration / urine* Electric Conductivity Exercise / physiology* Humans Male Osmolar Concentration Urine / chemistry |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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