Document Detail


Adaptation of the circulatory system to frequently repeated submaximal workloads in the light of left ventricular contraction analysis.
MedLine Citation:
PMID:  6679994     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In two groups of healthy men aged 20-22 years the left ventricular systolic time intervals were evaluated by the method of Weissler et al. during frequently repeated workloads and restitution. Each exercise was carried out on a Zimmerman cycle ergometer during 10 minutes, and was repeated five times at 50-minutes intervals from 8.00 o'clock a.m. Group I (15 subjects) performed the exercise at a stable workload which produced during the first exercise heart rate acceleration to 170/min, but gave a successive further rise in the heart rate during consecutive exercises. Group II (11 subjects) performed all exercises to a stable rise in heart rate to 170/min with decreasing workloads. It was found that successive exercises caused in both groups a similar decrease of the left ventricular ejection time index (LVETI), pre-ejection period (PEP), isovolumetric contraction time (ICT), and decrease of the PEP/LVET index (p less than 0.05). Each successive exercise began with higher values of LVETI, PEP, ICT and PEP/LVET than the first one. No significant differences were found in the values of left ventricular systolic time intervals in both groups (p greater than 0.05). The duration of restitution of normal values of the left ventricular systolic time intervals after successive exercises was not changing but the tolerance of these exercises measured by heart rate increase and work performed decreased successively.
Authors:
K Markiewicz; M Cholewa; Z Piotrowski
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta physiologica Polonica     Volume:  34     ISSN:  0044-6033     ISO Abbreviation:  Acta Physiol Pol     Publication Date:    1983 Sep-Dec
Date Detail:
Created Date:  1984-12-10     Completed Date:  1984-12-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985166R     Medline TA:  Acta Physiol Pol     Country:  POLAND    
Other Details:
Languages:  eng     Pagination:  581-93     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Cardiac Output
Cardiovascular Physiological Phenomena*
Heart Rate
Humans
Male
Myocardial Contraction*
Physical Exertion*
Systole
Ventricular Function

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


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