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- W2495434925 abstract "BACKGROUND Exercise training-induced hemodynamic and electrophysiological changes in the myocardium lead to physiological left ventricular (LV) hypertrophy with preserved cardiac contractility and function, which differentiates it from hypertrophic cardiomyopathy, the latter being responsible for a third of sudden deaths in young athletes. The extent and mechanisms of cardiac adaptation to aerobic training are still poorly understood, which is of concern given the increasing involvement of young athletes in intensive training regimens. OBJECTIVE The purpose of this study was to determine the effect of sports training on LV morphology and function at rest in adolescent boys. METHODS Anthropometric measurements, estimation of body composition and resting M-mode 2-D echocardiography were performed in twenty-four boys (aged 15-16 years), 12 swimmers and 12 soccer players. LV systolic and diastolic function were evaluated by pulsed wave Doppler measurements in four-chamber apical view. RESULTS The swimmers were significantly heavier and had greater fat-free body mass (p 54 mm) but no indication of ventricular hypertrophy. The swimmers had greater LV end-systolic and end-diastolic dimension than the soccer group (53.62 +/- 2.38 mm and 32.73 +/- 1.70 mm vs. 47.59 +/- 3.32 mm and 28.68 +/- 2.52 mm respectively). The differences between the groups persisted after allometric correction for body dimensions. The soccer group displayed significantly greater mean values for relative end-diastolic wall thickness (p < 0.01) but both groups showed eccentric LV enlargement (< 0.44 mm), especially the swimmers (p < 0.01). CONCLUSIONS Both groups showed an eccentric LV hypertrophy pattern. The swimmers, in particular, revealed high levels of chamber dilatation and systolic volume at rest, consistent with better venous return due to greater frequency and intensity of aerobic training." @default.
- W2495434925 created "2016-08-23" @default.
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- W2495434925 date "2008-07-01" @default.
- W2495434925 modified "2023-10-01" @default.
- W2495434925 title "Effects of chronic exercise training on left ventricular dimensions and function in young athletes." @default.
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