Document Detail


Influence of intensive cycling training on heart rate variability during rest and exercise.
MedLine Citation:
PMID:  14992127     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The current study examined whether changes in heart rate variability (HRV) following intensive cycling training contribute to the mechanism of training-induced bradycardia. Thirteen healthy untrained subjects, ages 18-27 years, underwent recordings of heart rate (HR) and VO2max before and after 8 weeks of cycling, 25-60 min/day, 5 days/week at > 80% maximum HR (HRmax). Heart rate recordings were obtained during supine rest and submaximal exercise and were analysed for the following components of HRV: low frequency (LF, 0.041-0.15 Hz); high frequency (HF, 0.15-0.40 Hz); LF/HF ratio and total power (TP, 0-0.40 Hz). At posttraining, VO2max was significantly increased while HR was significantly reduced at rest and all absolute exercise work rates. Training-induced lower HR was accompanied by significantly greater HF and TP during rest as well as LF, HF, and TP during all absolute exercise work rates. Posttraining HR and the majority of HRV measures were similar to pretraining values at the same relative exercise intensity (% HRmax). These results indicated that 8 weeks of intensive cycling training increased HRV and cardiac vagal modulation during rest and absolute exercise work rates but had little effect during relative exercise work rates. Increased vagal modulation resulting from intensive exercise training may contribute to the mechanism of training-induced bradycardia.
Authors:
Anthony S Leicht; Graham D Allen; Andrew J Hoey
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  28     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2004-03-02     Completed Date:  2004-04-06     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  898-909     Citation Subset:  IM    
Affiliation:
Institute of Sport and Exercise Science, James Cook University, Townsville, QLD 4811, Australia.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Bicycling / physiology
Female
Heart Rate / physiology*
Humans
Male
Oxygen Consumption / physiology
Physical Education and Training*
Rest
Statistics, Nonparametric

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


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