| Saliva parameters as potential indices of hydration status during acute dehydration. | |
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MedLine Citation:
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PMID: 15354035 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Firstly, to identify whether saliva flow rate, osmolality, and total protein are potential markers of hydration, we compared changes in these parameters with changes in plasma osmolality during progressive dehydration. Secondly, we compared the sensitivity of saliva parameters to track hydration changes with the sensitivity of urine osmolality. Thirdly, to test the hypothesis that dehydration, rather than neuroendocrine regulation, is responsible for the decrease in saliva flow rate during prolonged exercise, we compared flow rate and catecholamine responses to prolonged exercise with and without fluids. METHODS: colon; Fifteen males (plasma osmolality 289 +/- 4 mOsmol x kg(-1); mean +/- SD) exercised (30 degrees C, 70% RH) with no fluid intake (NFI) until body mass loss (BML) of 1.1, 2.1, and 3.0% and on another occasion with fluid intake (FI) to offset losses. RESULTS: colon; Plasma and urine osmolality increased during NFI (plasma osmolality 3.0% BML: 298 +/- 4 mOsmol x kg(-1); P < 0.01). Saliva flow rate decreased (P < 0.01), saliva total protein increased (P < 0.01), and saliva osmolality increased from preexercise (50 +/- 11 mOsmol x kg(-1)) to 3.0% BML (105 +/- 41 mOsmol x kg(-1)) during NFI (P < 0.01). Saliva osmolality, urine osmolality, and saliva total protein correlated strongly with plasma osmolality during dehydration (r 0.87, 0.83, and 0.91, respectively; P < 0.01). During the FI trial, saliva flow rate and osmolality remained unchanged. Plasma catecholamine concentration increased during exercise (P < 0.01) with no difference between trials. CONCLUSIONS: colon; Saliva osmolality and total protein appear to be as sensitive as urine osmolality to track hydration changes during hypertonic-hypovolemia. These results also suggest that dehydration has a greater involvement in the decrease in saliva flow rate during prolonged exercise than neuroendocrine regulation. |
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Authors:
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Neil P Walsh; Stewart J Laing; Samuel J Oliver; Joanna C Montague; Robert Walters; James L J Bilzon |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 36 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2004 Sep |
Date Detail:
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Created Date: 2004-09-08 Completed Date: 2004-12-09 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 1535-42 Citation Subset: IM; S |
Affiliation:
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School of Sport, Health and Exercise Sciences, University of Wales, Bangor, United Kingdom. n.walsh@bangor.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acute Disease Adult Catecholamines / blood Dehydration / diagnosis* Exercise Great Britain Humans Male Osmolar Concentration Oxygen Consumption Plasma Saliva / chemistry*, secretion Salivary Proteins and Peptides / analysis Urine Water-Electrolyte Balance |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 0/Salivary Proteins and Peptides |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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