Document Detail

Influence of prolonged exercise on myocardial distribution of 123I-MIBG in long-distance runners.
MedLine Citation:
PMID:  9362016     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: A study was conducted to determine if prolonged exercise could provoke sympathetic neuronal alteration in an athlete's heart through assessment of myocardial distribution of 123I-metaiodobenzylguanidine (MIBG) in nine ultramarathon runners at baseline and after a 4-hour race. METHODS AND RESULTS: After injection of 370 MBq of 123I-MIBG, the athletes ran for 4 hours, covering 45 +/- 8 km. Planar and single-photon emission computed tomography (SPECT) images of the thorax were acquired at the end of the race. Two weeks later, studies at baseline were performed. A heart:mediastinum ratio (HMR) was calculated to quantify MIBG uptake. Basal MIBG studies showed normal myocardial tracer uptake, on both planar and SPECT images, and the HMR was 1.84 +/- 0.16. After the 4-hour race, MIBG studies showed decreased myocardial uptake in all athletes, and the HMR was 1.70 +/- 0.18 (p < 0.005). A positive correlation between the percentage of decrease of HMR after the race and the distance covered was observed (r = .910, p < 0.001). CONCLUSIONS: Myocardial MIBG activity is decreased by prolonged exercise in long-distance runners. The degree of reduction of myocardial MIBG activity is related to the distance covered. Prolonged exercise, as sustained sympathetic stimulus, may alter myocardial distribution of MIBG.
M Estorch; R Serra-Grima; I Carrió; A Flotats; A Lizárraga; L L Bernà; T Prats; R Segura
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology     Volume:  4     ISSN:  1071-3581     ISO Abbreviation:  J Nucl Cardiol     Publication Date:    1997 Sep-Oct
Date Detail:
Created Date:  1997-12-19     Completed Date:  1997-12-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9423534     Medline TA:  J Nucl Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  396-402     Citation Subset:  IM    
Department of Nuclear Medicine, Hospital de Sant Paul, Barcelona, Spain.
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MeSH Terms
3-Iodobenzylguanidine / diagnostic use*
Heart / innervation,  radionuclide imaging*
Middle Aged
Radiopharmaceuticals / diagnostic use*
Sympathetic Nervous System / physiology
Tomography, Emission-Computed, Single-Photon*
Reg. No./Substance:
0/Radiopharmaceuticals; 77679-27-7/3-Iodobenzylguanidine

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