Document Detail

Interaction of cardiac and muscle mechanical afferents on baroreflex control of the sinus node during dynamic exercise.
MedLine Citation:
PMID:  19522750     Owner:  NLM     Status:  MEDLINE    
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.
L Vorluni; S Volianitis
Publication Detail:
Type:  Journal Article     Date:  2009-06-09
Journal Detail:
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:
Created Date:  2010-07-05     Completed Date:  2010-11-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  434-40     Citation Subset:  IM    
Centre for Sports Medicine and Human Performance, Brunel University, Uxbridge, Middlesex, UK.
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MeSH Terms
Baroreflex / physiology*
Blood Pressure
Cardiac Output / physiology
Exercise Test
Myocardium / metabolism*
Physical Exertion / physiology*
Sinoatrial Node / physiology*
Visceral Afferents / physiology*

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