| Fluid replacement and heat stress during exercise alter post-exercise cardiac haemodynamics in endurance exercise-trained men. | |
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MedLine Citation:
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PMID: 19491249 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It has been reported that endurance exercise-trained men have decreases in cardiac output with no change in systemic vascular conductance during post-exercise hypotension, which differs from sedentary and normally active populations. As inadequate hydration may explain these differences, we tested the hypothesis that fluid replacement prevents this post-exercise fall in cardiac output, and further, exercise in a warm environment would cause greater decreases in cardiac output. We studied 14 trained men (VO2,peak 4.66 +/- 0.62 l min(-1)) before and to 90 min after cycling at 60% VO2,peak for 60 min under three conditions: Control (no water was consumed during exercise in a thermoneutral environment), Fluid (water was consumed to match sweat loss during exercise in a thermoneutral environment) and Warm (no water was consumed during exercise in a warm environment). Arterial pressure and cardiac output were measured pre- and post-exercise in a thermoneutral environment. The fall in mean arterial pressure following exercise was not different between conditions (P = 0.453). Higher post-exercise cardiac output (Delta 0.41 +/- 0.17 l min(-1); P = 0.027), systemic vascular conductance (Delta 6.0 +/- 2.2 ml min(-1) mmHg(-1); P = 0.001) and stroke volume (Delta 9.1 +/- 2.1 ml beat(-1); P < 0.001) were seen in Fluid compared to Control, but there was no difference between Fluid and Warm (all P > 0.05). These data suggest that fluid replacement mitigates the post-exercise decrease in cardiac output in endurance-exercise trained men. Surprisingly, exercise in a warm environment also mitigates the post-exercise fall in cardiac output. |
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Authors:
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Brenna M Lynn; Christopher T Minson; John R Halliwill |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2009-06-02 |
Journal Detail:
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Title: The Journal of physiology Volume: 587 ISSN: 1469-7793 ISO Abbreviation: J. Physiol. (Lond.) Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-07-15 Completed Date: 2009-10-15 Revised Date: 2010-09-24 |
Medline Journal Info:
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Nlm Unique ID: 0266262 Medline TA: J Physiol Country: England |
Other Details:
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Languages: eng Pagination: 3605-17 Citation Subset: IM |
Affiliation:
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Department of Human Physiology, University of Oregon, Eugene, OR 97403-1240, USA . |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Volume / physiology* Cardiac Output / physiology* Exercise / physiology* Fluid Therapy / methods* Heat-Shock Response / physiology* Humans Male Physical Endurance / physiology* Physical Fitness / physiology* Young Adult |
| Comments/Corrections | |
Comment In:
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J Physiol. 2009 Jul 15;587(Pt 14):3419-20
[PMID:
19602633
]
J Physiol. 2010 Jan 1;588(Pt 1):27-8 [PMID: 20045905 ] |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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