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Differential effects of variation in athletes training on myocardial morphophysiological adaptation in men: Focus on (123)I-MIBG assessed myocardial sympathetic activity.
MedLine Citation:
PMID:  24627344     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: High intensity systematic physical training leads to myocardial morphophysiological adaptations. The goal of this study was to investigate if differences in training were correlated with differences in cardiac sympathetic activity.
METHODS: 58 males (19-47 years), were divided into three groups: strength group (SG), (20 bodybuilders), endurance group (EG), (20 endurance athletes), and a control group (CG) comprising 18 healthy non-athletes. Cardiac sympathetic innervation was assessed by planar myocardial (123)I-metaiodobenzylguanidine scintigraphy using the early and late heart to mediastinal (H/M) ratio, and washout rate (WR).
RESULTS: Left ventricular mass index was significantly higher both in SG (P < .001) and EG (P = .001) compared to CG without a statistical significant difference between SG and EG (P = .417). The relative wall thickness was significantly higher in SG compared to CG (P < .001). Both left ventricular ejection fraction and the peak filling rate showed no significant difference between the groups. Resting heart rate was significantly lower in EG compared to CG (P = .006) and SG (P = .002). The late H/M ratio in CG was significantly higher compared to the late H/M for SG (P = .003) and EG (P = .004). However, WR showed no difference between the groups. There was no significant correlation between the parameters of myocardial sympathetic innervation and parameters of left ventricular function.
CONCLUSIONS: Strength training resulted in a significant increase in cardiac dimensions. Both strength and endurance training seem to cause a reduction in myocardial sympathetic drive. However, myocardial morphological and functional adaptations to training were not correlated with myocardial sympathetic activity.
Authors:
Douglas Pinheiro Miranda; Marcelo José Dos Santos; Vera Maria Cury Salemi; Edmundo Pereira Caparelli de Oliveira; Hein J Verberne; Euclides Timóteo da Rocha
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-3-14
Journal Detail:
Title:  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology     Volume:  -     ISSN:  1532-6551     ISO Abbreviation:  J Nucl Cardiol     Publication Date:  2014 Mar 
Date Detail:
Created Date:  2014-3-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9423534     Medline TA:  J Nucl Cardiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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