Myocardial perfusion and perfusion reserve in endurance-trained men.

Full Abstract

PURPOSE:
This study was undertaken to determine whether endurance training is associated with changes in myocardial perfusion in humans.

METHODS:
Myocardial perfusion was measured in eleven trained and nine sedentary men at rest and during adenosine-stimulated hyperemia using positron emission tomography (PET). Left ventricular (LV) dimensions and mass were measured using echocardiography. Myocardial work per gram of tissue was calculated as (cardiac output. mean arterial blood pressure)/LV mass.

RESULTS:
LV mass was significantly higher and myocardial work per gram of tissue lower in the trained than in the untrained subjects. Basal (0.78 +/- 0.10 and 0.76 +/- 0.15 mL. min-1. g-1, P = NS) and adenosine-stimulated perfusion (3.46 +/- 0.91 and 3.14 +/- 0.70 mL. min-1. g-1, P = NS) were similar between trained and untrained men, respectively. Consequently, myocardial perfusion reserve was similar in both groups (4.4 +/- 1.2 and 4.1 +/- 0.7, P = NS). In addition, coronary resistance at baseline (115 +/- 17 vs 119 +/- 22, mm Hg. mL. min-1. g-1, P = NS) and during adenosine infusion (28 +/- 8 vs 30 +/- 8, mm Hg. mL. min-1. g-1, P = NS) were similar in both groups. Resting myocardial work correlated with resting myocardial perfusion in both groups, but the relationship between perfusion and work was different between the groups so that perfusion for a given myocardial work was significantly higher in trained subjects (0.56 +/- 0.04 and 0.34 +/- 0.05 mL. (mm Hg. L)-1, P < 0.001).

CONCLUSIONS:
These findings suggest that endurance trained subjects do not have different resting or adenosine-stimulated myocardial perfusion. However, the relationship between myocardial perfusion and work appears altered in the athletes.

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Author information

Author/s: Kalliokoski, Kari K (KK); Nuutila, Pirjo (P); Laine, Hanna (H); Luotolahti, Matti (M); Janatuinen, Tuula (T); Raitakari, Olli T (OT); Takala, Teemu O (TO); Knuuti, Juhani (J);

Affiliation: Turku PET Centre, Turku, Finland. Kari.Kalliokoski(-atsign-)pet.tyks.fi

Journal and publication information

Publication Type: Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't

Journal: Medicine and science in sports and exercise (Med Sci Sports Exerc), published in United States. (Language: eng)

Reference: 2002-Jun; vol 34 (issue 6) : pp 948-53

Dates: Created 2002/06/05; Completed 2002/07/17; Revised 2006/11/15;

PMID: 12048320, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adenosine - administration & dosage
Adult
Coronary Circulation - physiology
Echocardiography
Exercise - physiology
Humans
Life Style

Male
Myocardium - metabolism
Physical Education and Training - methods
Physical Endurance - physiology
Rest - physiology
Tomography, Emission-Computed
Ventricular Function, Left - physiology

Associated Chemicals: Adenosine (58-61-7)

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