Document Detail


Myocardial performance during progressive exercise in athletic adolescent males.
MedLine Citation:
PMID:  19657299     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The extent that enhanced ventricular function contributes to superior aerobic fitness of trained athletes is unclear. This study compared cardiovascular responses to progressive cycle exercise in 12 adolescent soccer players and 10 untrained boys with assessment of ventricular inotropic and relaxation properties by Doppler ultrasound techniques. METHODS: Resting cardiac dimensions were measured by M-mode echocardiography. Stroke volume was estimated by the Doppler technique, and systolic function by peak aortic flow velocity and ejection flow rate. Diastolic transmitral pressure gradient was assessed by pulse wave peak E-wave velocity, ventricular relaxation properties by tissue Doppler imaging (E' velocity, adjusted for ventricular size), and ventricular filling pressure by E/E' ratio. RESULTS: Size-adjusted cardiac dimensions were significantly greater in the athletes. Peak V O2 values for the athletes and nonathletes were 57.4 +/- 4.8 and 44.4 +/- 6.6 mL.kg.min, respectively. Maximal cardiac index and stroke index were greater in the athletes (11.10+/- 1.52 vs 9.02 +/- 2.05 L.min.m; 59 +/- 8 vs 46 +/- 10 mL.m). Athletes and nonathletes demonstrated similar maximal peak aortic velocity (231 +/- 20 and 208 +/- 45 cm.s, respectively) and ejection rate (13.3 +/- 1.0 and 12.5 +/- 2.8 mL.s.cm x 10, respectively). No significant group differences were observed in Emax (155 +/- 17 and 149 +/- 23 cm.s for athletes and nonathletes, respectively), adjusted E'max (5.9 +/- 1.2 and 5.8 +/- 1.2 cm.s.mm for athletes and nonathletes, respectively), and E/E'max (265 +/- 40 and 262 +/- 56 for athletes and nonathletes, respectively). CONCLUSIONS: This study revealed no differences between young trained athletes and nonathletes in myocardial functional responses to progressive exercise, implying that greater aerobic fitness in these athletes reflected volume expansion of the cardiovascular system without contribution of enhanced systolic or diastolic ventricular function. Such findings should be considered limited to the context of young athletes with limited duration of athletic training.
Authors:
Thomas W Rowland; Max Garrard; Simon Marwood; Miriam E Guerra; Denise Roche; Viswanath B Unnithan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  41     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-08-18     Completed Date:  2009-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1721-8     Citation Subset:  IM; S    
Affiliation:
Department of Pediatrics, Baystate Medical Center, Springfield, MA, USA. Thomas.rowland@bhs.org
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Blood Pressure / physiology
Exercise / physiology*
Exercise Test / methods
Heart Function Tests / methods*
Humans
Male
Oxygen Consumption
Physical Fitness / physiology*
Stroke Volume / physiology
Ultrasonography, Doppler
Ventricular Function / physiology

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


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