OBJECTIVE To examine the correlation between heart rate variability and left ventricular mass in cyclists with an athlete's heart. METHODS Left ventricular mass and diastolic function were determined at rest and myocardial high energy phosphates were quantified at rest and during atropine-dobutamine stress in 12 male cyclists and 10 control subjects, using magnetic resonance techniques. Ambul...

BACKGROUND Exercise training (ExT) improves exercise capacity in chronic heart failure, but the results of home-based training have been variable. We sought the predictors of favorable outcome using a telemonitoring approach. METHODS Exercise capacity and quality of life (QOL) were assessed in 30 patients (28 men, age 64 +/- 8 years) with symptomatic chronic heart failure and left ventricular...

background heart failure is a major cause of death in thalassemia. the study aimed to determine the diagnostic value of n terminal pro b type natriuretic peptide (nt-pro bnp), to early diagnose the cardiac involvement in beta- thalassemia major patients. materials and methods  80 thalassemia patients aged 7 to 18 years old (patients group), and 80 healthy age and gender matched controls were en...

background: to establish a balance between work (physical exercise) and human, the aerobic capacity (vo2max) could be used as a measure. assessing heart rate in association to physiological symptoms is the most commonly used tools for the assessment of fatigue during physical exercise. this study aimed to investigate the association between the aerobic capacity and the heart rate of workers fro...

We studied functional and intracellular calcium responses to treppe and extracellular calcium in spontaneously hypertensive rat (SHR) hearts during the transition from compensated pressure overload to failure. Intracellular calcium was measured using aequorin, a bioluminescent Ca2+ indicator. Experiments were performed with intact, isovolumically contracting, buffer-perfused hearts from three r...