| Respiratory influences on non-linear dynamics of heart rate variability in humans. | |
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MedLine Citation:
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PMID: 9309859 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The goal of our study was to determine whether evidence for chaos in heart rate variability (HRV) can be observed when the respiratory input to the autonomic controller of heart rate is forced by the deterministic pattern associated with periodic breathing. We simultaneously recorded, in supine healthy volunteers, RR intervals and breathing volumes for 20 to 30 min (1024 data point series) during three protocols: rest (control), fixed breathing (15 breath/min) and voluntary periodic breathing (3 breaths with 2 s inspiration and 2 s expiration followed by an 8 s breath hold). On both the RR interval and breathing volume series we applied the non-linear prediction method (Sugihara and May algorithm) to the original time series and to distribution-conserved isospectral surrogate data. Our results showed that, in contrast to the control test, during both fixed and voluntary periodic breathing the variability of breathing volumes was clearly deterministic non-chaotic. During all the three protocols, the RR-interval series' non-linear predictability was consistent with one of a chaotic series. However, at rest, no clear difference was observed between the RR-interval series and their surrogates, which means that no clear chaos was observed. During fixed breathing a difference appeared, and this difference seemed clearer during voluntary periodic breathing. We concluded that HRV dynamics were chaotic when respiration was forced with a deterministic non-chaotic pattern and that normal spontaneous respiratory influences might mask the normally chaotic pattern in HRV. |
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Authors:
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J O Fortrat; Y Yamamoto; R L Hughson |
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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: Biological cybernetics Volume: 77 ISSN: 0340-1200 ISO Abbreviation: Biol Cybern Publication Date: 1997 Jul |
Date Detail:
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Created Date: 1997-10-23 Completed Date: 1997-10-23 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7502533 Medline TA: Biol Cybern Country: GERMANY |
Other Details:
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Languages: eng Pagination: 1-10 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, University of Waterloo, Ontario, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Female Heart Rate / physiology* Humans Male Nonlinear Dynamics* Periodicity Respiration / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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