| Human hydration indices: acute and longitudinal reference values. | |
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MedLine Citation:
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PMID: 20479488 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It is difficult to describe hydration status and hydration extremes because fluid intakes and excretion patterns of free-living individuals are poorly documented and regulation of human water balance is complex and dynamic. This investigation provided reference values for euhydration (i.e., body mass, daily fluid intake, serum osmolality; M +/- SD); it also compared urinary indices in initial morning samples and 24-hr collections. Five observations of 59 healthy, active men (age 22 +/- 3 yr, body mass 75.1 +/- 7.9 kg) occurred during a 12-d period. Participants maintained detailed records of daily food and fluid intake and exercise. Results indicated that the mean total fluid intake in beverages, pure water, and solid foods was >2.1 L/24 hr (range 1.382-3.261, 95% confidence interval 0.970-3.778 L/24 hr); mean urine volume was >1.3 L/24 hr (0.875-2.250 and 0.675-3.000 L/24 hr); mean urine specific gravity was >1.018 (1.011-1.027 and 1.009-1.030); and mean urine color was > or = 4 (4-6 and 2-7). However, these men rarely (0-2% of measurements) achieved a urine specific gravity below 1.010 or color of 1. The first morning urine sample was more concentrated than the 24-h urine collection, likely because fluids were not consumed overnight. Furthermore, urine specific gravity and osmolality were strongly correlated (r2 = .81-.91, p < .001) in both morning and 24-hr collections. These findings provide euhydration reference values and hydration extremes for 7 commonly used indices in free-living, healthy, active men who were not exercising in a hot environment or training strenuously. |
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Authors:
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Lawrence E Armstrong; Amy C Pumerantz; Kelly A Fiala; Melissa W Roti; Stavros A Kavouras; Douglas J Casa; Carl M Maresh |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sport nutrition and exercise metabolism Volume: 20 ISSN: 1526-484X ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-05-18 Completed Date: 2010-06-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
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Languages: eng Pagination: 145-53 Citation Subset: IM |
Affiliation:
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Human Performance Laboratory, University of Connecticut, Storrs, CT, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Body Water
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chemistry,
metabolism* Circadian Rhythm / physiology* Color Dehydration / diagnosis, urine Drinking* Humans Hydrogen-Ion Concentration Male Osmolar Concentration Reference Values Specific Gravity Urinalysis Urine / chemistry* Urodynamics / physiology Water-Electrolyte Balance / physiology* Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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