| Fluid ingestion attenuates the decline in VO2peak associated with cardiovascular drift. | |
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MedLine Citation:
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PMID: 16672844 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION/PURPOSE: This study investigated whether manipulation of cardiovascular drift (CV drift) by changing exercise duration or by fluid ingestion is associated with altered peak oxygen uptake VO(2peak). METHODS: VO(2peak) was measured in 11 trained men immediately after they cycled at 60% control VO(2max) in 30 degrees C, 40% relative humidity for 15, 60, and 120 min with no fluid (15 NF, 60 NF, 120 NF) or 120 min with fluid (120 F). Stroke volume (SV), heart rate (HR), and related measures were measured in 120 NF and 120 F at 15, 60, and 120 min. RESULTS: Body mass decreased 0.7, 2.3, and 3.7% in 120 F, 60 NF, and 120 NF. SV at the end of submaximal exercise and VO(2peak) measured immediately thereafter were reduced significantly (P < 0.05) from 15-min values in 120 NF (13.8 and 8.7%) but not in 60 NF (4.6 and 1.2%) or 120 F (2.1 and 1.9%). CONCLUSIONS: The progressive decline in SV during prolonged, constant-rate submaximal exercise in a warm environment, reflective of increased cardiovascular strain associated with hyperthermia, dehydration, and other changes that occur over time, reduces VO(2peak). Fluid ingestion improves performance in prolonged exercise, in part, by mitigating the decline in SV and its determinants, and preserving VO(2peak). |
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Authors:
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Matthew S Ganio; Jonathan E Wingo; Candace E Carrolll; Mia K Thomas; Kirk J Cureton |
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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: Medicine and science in sports and exercise Volume: 38 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2006 May |
Date Detail:
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Created Date: 2006-05-04 Completed Date: 2006-10-12 Revised Date: 2006-11-15 |
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: 901-9 Citation Subset: IM; S |
Affiliation:
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Department of Kinesiology, University of Georgia, Athens, USA. matthew.ganio@uconn.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling Cardiac Output* Dehydration Drinking* Heart Rate / physiology* Humans Male Monitoring, Physiologic / methods Oxygen Consumption / physiology* Stroke Volume United States |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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