Document Detail


Chronotropic and pressor effects of water ingestion at rest and in response to incremental dynamic exercise.
MedLine Citation:
PMID:  23475823     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Water drinking attenuates the chronotropic response to submaximal exercise. However, it is not known whether this effect is equally manifested during dynamic exercise below and above ventilatory threshold (VT). We explored the effects of water ingestion on the heart rate response to an incremental cycle-ergometer protocol. In a randomized fashion, 19 healthy adults (10 men; 9 women, age: 20.9 ± 1.8 years) ingested 50 and 500 mL of water before completing a cycle-ergometer protocol on two separate days. The heart rate and oxygen uptake (VO2) responses to water ingestion were analyzed both at rest and during exercise performed below and above VT. The effects of water intake on brachial blood pressure were measured only at rest. Resting mean arterial pressure increased and resting heart rate decreased, but only after 500 mL of water (p<0.05). Compared with that seen post-50 mL of water, the 500 mL volume elicited an overall decrease in submaximal heart rate (p<0.05). In contrast, drinking 500 mL of water did not affect submaximal VO2. The participants' maximal heart rate, VO2max and VT were similar between conditions. Our results therefore indicate that, due to its effects on submaximal heart rate over a broad spectrum of intensities, water drinking should be recognized as a potential confounder in cardiovascular exercise studies. However, by showing no differences between conditions for submaximal VO2, they also suggest that the magnitude of heart rate reduction post-500 mL of water may be of minimal physiological significance for exercise cardiorespiratory capacity.
Authors:
Goncalo V Mendonca; Micael S Teixeira; Kevin S Heffernan; Bo Fernhall
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-8
Journal Detail:
Title:  Experimental physiology     Volume:  -     ISSN:  1469-445X     ISO Abbreviation:  Exp. Physiol.     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9002940     Medline TA:  Exp Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 Human Kinetics Faculty, Technical University of Lisbon - Portugal.;
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