| Interaction of cardiac and muscle mechanical afferents on baroreflex control of the sinus node during dynamic exercise. | |
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MedLine Citation:
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PMID: 19522750 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of cardiopulmonary baroreceptors and muscle mechanoreceptors stimulation on cardiac baroreflex sensitivity (BRS), and heart rate variability (HRV) were evaluated by measuring continuously and non-invasively systolic blood pressure (SBP) and pulse interval (PI) during upright and supine passive cycling. BRS and HRV were evaluated with the cross-correlation method (xBRS) and in the frequency domain, respectively. At rest, the shift from upright to supine posture enhanced xBRS from 16.4+/-12.1 to 23.4+/-12.9 ms/mmHg, and the high frequency (HF, 0.15-0.4 Hz) power of HRV from 48.9+/-18.6 to 55.1+/-14.7 normalized units (NU), while it attenuated the low-frequency (LF, 0.04-0.15 Hz) power from 51.1+/-18.6 to 44.9+/-14.7 NU (P<0.05), respectively. During both upright and supine passive exercise, xBRS and the HF power were attenuated (10.0+/-8.0 and 12.5+/-9.0 ms/mmHg; 41.1+/-21.2 and 41.5+/-12.7 NU, respectively; P<0.05) and the LF power increased (58.8+/-21.2 and 58.5+/-12.7 NU, P<0.05), compared with rest. The effect of mechanoreflex activation overrides that of the cardiopulmonary baroreceptors loading resulting in decreased cardiac vagal outflow and reduced BRS during supine passive exercise. |
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Authors:
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L Vorluni; S Volianitis |
Publication Detail:
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Type: Journal Article Date: 2009-06-09 |
Journal Detail:
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Title: Scandinavian journal of medicine & science in sports Volume: 20 ISSN: 1600-0838 ISO Abbreviation: Scand J Med Sci Sports Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-07-05 Completed Date: 2010-11-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9111504 Medline TA: Scand J Med Sci Sports Country: Denmark |
Other Details:
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Languages: eng Pagination: 434-40 Citation Subset: IM |
Affiliation:
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Centre for Sports Medicine and Human Performance, Brunel University, Uxbridge, Middlesex, UK. luigi.vorluni@brunel.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Baroreflex / physiology* Biomechanics Blood Pressure Cardiac Output / physiology Exercise Test Female Humans Male Myocardium / metabolism* Physical Exertion / physiology* Pulse Sinoatrial Node / physiology* Visceral Afferents / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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