Echocardiographic assessment of myocardial performance after prolonged strenuous exercise.
Eur Heart J
; 12(11): 1183-8, 1991 Nov.
Article
em En
| MEDLINE
| ID: mdl-1782946
ABSTRACT
To determine the effect of strenuous prolonged exercise on systolic and diastolic left ventricular function, 11 non-elite marathon runners aged 37 +/- 7 years (mean +/- SD) were studied before and during early recovery from a marathon race. Cavity dimensions, wall thickness, and fractional shortening were computed from two-dimensionally guided M-mode echocardiograms. Doppler left ventricular inflow tract recordings were analysed for peak early and late velocities and their ratio. In seven subjects, heart frequency was recorded throughout the race. These subjects ran the marathon at 87 +/- 4% of their maximal heart rate. Left ventricular diastolic dimension was slightly reduced at the end of the race (49.4 +/- 4.2 mm to 47.3 +/- 5.1 mm; P less than 0.05). Fractional shortening remained unchanged, although blood pressure (P less than 0.001) and systolic wall stress (P less than 0.01) were decreased. The left ventricular filling pattern was unchanged, and the ratio of early to late velocities remained constant. These results suggest that the fractional shortening was a result of the opposing effects of changes in preload and afterload. However, the absence of a change in the end systolic dimension, despite a marked reduction in afterload and the occurrence of septal akinesia in one subject after the race could only suggest that strenuous prolonged exercise may alter myocardial performance.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sístole
/
Ecocardiografia
/
Exercício Físico
/
Função Ventricular Esquerda
/
Diástole
Limite:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Eur Heart J
Ano de publicação:
1991
Tipo de documento:
Article