Document Detail


Left ventricular dynamics during early recovery from maximal exercise in boys and men.
MedLine Citation:
PMID:  12471301     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A transient increase in left ventricular emptying has been reported in adults during the early recovery from submaximal upright exercise. PURPOSE: To investigate whether this "overshoot" occurs also after maximal exercise, and whether it is an age-related phenomenon. METHODS: Ten healthy young men (mean age: 22.5 +/- 1.5 yr) and 17 healthy prepubertal boys (11.5 +/- 0.8 yr) performed an upright cycle test until exhaustion. Respiratory gas exchange, heart rate, left ventricular dimensions (two-dimensional echocardiography method) as well as blood pressures (manual sphygmomanometry) were assessed and systemic vascular resistances were calculated at rest, during the final minute of the test, and during a 10-min recovery period. RESULTS: An improvement of cardiac emptying, characterized by a decrease in left ventricular end-systolic diameter, was observed in adults only. Moreover, during the first minute of recovery, a larger decrease in heart rate -21.8 +/- 7.6% and -13.7 +/- 6.3 beat.min, respectively, in children and adults, P < 0.01) and a larger increase in systemic vascular resistance (+24.1 +/- 18.2% and +6.4 +/- 12.6%, P < 0.05) were observed in the boys rather than in the adults. CONCLUSION: Our results suggest that a higher increase in cardiac afterload and a more prominent decrease in heart rate may be responsible in part for the absence of cardiac overshoot in children.
Authors:
Stéphane Nottin; Agnes Vinet; Stéphane Mandigout; Long-Dang Nguyen; François Stecken; Fawzi Ounissi; Anne-Marie Lecoq; Philippe Obert
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  34     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-12-09     Completed Date:  2003-03-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1951-7     Citation Subset:  IM; S    
Affiliation:
Laboratoire de Physiologie des Adaptations Cardiovasculaires à L'Exercice, Faculté des Sciences, Département STAPS, 33 rue Louis Pasteur, 84000 Avignon, France. stephane.nottin@libertysurf.fr
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MeSH Terms
Descriptor/Qualifier:
Adult
Age Factors
Blood Pressure / physiology
Body Mass Index
Body Surface Area
Child
Diastole / physiology
Echocardiography
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Heart Ventricles / ultrasonography
Humans
Male
Oxygen Consumption / physiology
Recovery of Function / physiology*
Reference Values
Stroke Volume / physiology
Systole / physiology
Time Factors
Vascular Resistance / physiology
Ventricular Function*
Ventricular Function, Left / physiology*

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


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