Document Detail

Effects of physical conditioning on cardiac autonomic function in healthy middle-aged women.
MedLine Citation:
PMID:  11880688     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine whether moderate exercise training affects heart rate variability (HRV) and spontaneous baroreflex (SBR) function in healthy middle-aged women. Thirty-two sedentary women aged 40-59 yr were divided into four groups depending on reproductive state (premenopausal, PrM or postmenopausal, PoM, and training group (exercise or sedentary control group). The electrocardiographic R-R interval and systolic blood pressure (finger plethysmograph) were measured at rest during paced breathing at 16 breaths/min in the left lateral decubitus, sitting, and free standing postures, and during upright cycling at 40% maximal heart rate reserve (MHRR). After initial testing, the exercise groups underwent a 12 week walking program. After training, both exercise groups (PrM and PoM) had a longer R-R interval in all conditions, a higher SBR slope in the sitting and standing posture and lower sympathetic modulation in the standing posture, than the control groups and pre-training levels. During exercise, vagal modulation was higher and sympathetic modulation was lower in both exercise groups compared to pre-training values. Vagal modulation is increased following moderate intensity aerobic conditioning in middle-aged women.
Paula R Myslivecek; C Ann Brown; Larry A Wolfe
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  27     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-03-06     Completed Date:  2002-04-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-18     Citation Subset:  IM    
School of Physical and Health Education, School of Nursing and Department of Physiology, Queen's University, Kingston, ON, Canada, K7L 3N6.
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MeSH Terms
Analysis of Variance
Autonomic Nervous System / physiology*
Baroreflex / physiology
Blood Pressure / physiology
Exercise Test
Heart Conduction System / physiology*
Heart Rate / physiology
Middle Aged
Walking / physiology*

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

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