| Effect of acute hypoxia on heart rate variability at rest and during exercise. | |
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MedLine Citation:
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PMID: 15162245 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to investigate sympathovagal balance as inferred from heart rate variability (HRV) responses to acute hypoxia at rest and during exercise. HRV was evaluated in 12 healthy subjects during a standardized hypoxic tolerance test which consists of four periods alternating rest and moderate exercise (50 % V.O (2)max) in normoxic and hypoxic conditions. Ventilatory responses were determined and HRV indexes were calculated for the last 5 min of each period. In well-tolerant subjects, hypoxia at rest induced a decrease of root-mean-square of successive normal R-R interval differences (RMSSD) (p < 0.05) and of absolute high frequency (HF) power (p < 0.001). All absolute HRV indexes were strongly reduced during exercise (p < 0.001) with no further changes under the additional stimulus of hypoxia. A significant increase (p < 0.05) in the HF/(LF+HF) ratio (where LF is low frequency power) was found during exercise in hypoxia compared to exercise in normoxia, associated with similar mean changes in ventilation and tidal volume. These results indicate a vagal control withdrawal under hypoxia at rest. During exercise at 50 % V.O (2)max, HRV indexes cannot adequately represent cardiac autonomic adaptation to acute hypoxia, or possibly to other additional stimuli, due to the dominant effect of exercise and the eventual influence of confounding factors. |
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Authors:
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M Buchheit; R Richard; S Doutreleau; E Lonsdorfer-Wolf; G Brandenberger; C Simon |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article |
Journal Detail:
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Title: International journal of sports medicine Volume: 25 ISSN: 0172-4622 ISO Abbreviation: Int J Sports Med Publication Date: 2004 May |
Date Detail:
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Created Date: 2004-05-26 Completed Date: 2004-09-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: Germany |
Other Details:
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Languages: eng Pagination: 264-9 Citation Subset: IM |
Affiliation:
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Laboratoire des Régulations Physiologiques et des Rythmes Biologiques chez l'Homme, Strasbourg, France. Martin.Buchheit@physio-ulp.u-strasbg.fr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology Adult Anoxia / physiopathology* Exercise / physiology* Heart Rate / physiology* Humans Male Pulmonary Ventilation / physiology Respiration Rest / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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