Document Detail


Resting bradycardia of exercise training: a concept based on currently available data.
MedLine Citation:
PMID:  1108127     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The classic view that the resting bradycardia of exercise training is due to an increase in the tonic discharge of the vagi is no longer tenable; If it were true, full doses of atropine would accelerate the heart to a greater extent in the athletic animal. All investigators agree that the reverse is the case. Some workers report a decrease in cardiac sympathetic influence after training. This would cause a preponderance of vagal influence which may decrease to a lesser extent than the sympathetics or may not change at all. Several studies have demonstrated that training causes a distinct slowing of the intrinsic rate of the pacemaker. It is concluded that two factors operate to lower the resting heart rate after athletic training: 1) slowing of the intrinsic rate of the pacemaker, 2) Increase in cholinergic predominance on the pacemaker frequency as a result of a decrease in adrenergic influence. Vagal influence per se seems either to remain the same or to decrease slightly in the athlete compared to the nonathelete. It appears that slowing of the intrinsic rate plays a more important role, a factor that has been hitherto overlooked. The mechanisms underlying these changes remain obscure.
Authors:
H S Badeer
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Recent advances in studies on cardiac structure and metabolism     Volume:  10     ISSN:  0363-5872     ISO Abbreviation:  Recent Adv Stud Cardiac Struct Metab     Publication Date:  1975  
Date Detail:
Created Date:  1976-04-01     Completed Date:  1976-04-01     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0325677     Medline TA:  Recent Adv Stud Cardiac Struct Metab     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  553-60     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acetylcholine / metabolism
Animals
Atropine / pharmacology
Heart Atria / metabolism
Heart Rate* / drug effects
Humans
Male
Muscle Denervation
Physical Education and Training*
Physical Exertion*
Propranolol / pharmacology
Vagus Nerve / physiology
Chemical
Reg. No./Substance:
51-55-8/Atropine; 51-84-3/Acetylcholine; 525-66-6/Propranolol

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


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