Document Detail

Sympathoadrenergic mechanisms in reduced hemodynamic stress responses after exercise.
MedLine Citation:
PMID:  12783046     Owner:  NLM     Status:  MEDLINE    
PURPOSE: This study examines the acute effects of moderate aerobic exercise on 1) hemodynamic and sympathetic activity during behavioral stress and 2) beta-adrenergic receptor responsivity in a biracial sample of 24 sedentary adults. METHODS: Before and after exercise, blood pressure (BP), impedance-derived cardiovascular measures, and plasma norepinephrine (NE) and epinephrine (EPI) were assessed during mental arithmetic and active speech tasks, and beta-adrenergic receptor responsivity was assessed using a standard isoproterenol challenge procedure. RESULTS: After exercise, BP, NE, and EPI responses to stress were reduced (0.0001 < P < 0.08), preejection period (PEP) was elongated (P < 0.0001), and beta(1)- and beta(2)-receptor responsivity (P < 0.02) was enhanced. Approximately 65% of the prepost exercise mean arterial pressure response difference could be accounted for by changes in sympathetic factors, with change in NE and PEP being the single best predictors. CONCLUSIONS: Reduced BP responses to stress after acute exercise are strongly linked to a decrease in sympathetic drive, as evidenced by reduced NE responses and elongation of the PEP. Coincident with this overall dampening of the hemodynamic response to stress, increases in cardiac and vascular beta-adrenergic receptor responsivity occur. These findings may have important implications for future translational studies that seek to articulate the mechanisms through which regular aerobic exercise reduces the risks of hypertensive and coronary heart disease.
Kimberly A Brownley; Alan L Hinderliter; Sheila G West; Susan S Girdler; Andrew Sherwood; Kathleen C Light
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  35     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-06-03     Completed Date:  2003-09-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  978-86     Citation Subset:  IM; S    
Department of Psychiatry, University of North Carolina, Chapel Hill 27599, USA.
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MeSH Terms
Blood Pressure / physiology*
Coronary Disease / etiology,  prevention & control
Epinephrine / blood
Exercise / physiology*
Hypertension / complications,  etiology,  prevention & control
Norepinephrine / blood
Receptors, Adrenergic, beta / physiology*
Stress, Psychological*
Sympathetic Nervous System / physiology*
Grant Support
Reg. No./Substance:
0/Receptors, Adrenergic, beta; 51-41-2/Norepinephrine; 51-43-4/Epinephrine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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