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.
Ambulatory 24 hour ECG recordings were obtained, and time and frequency domain heart rate variability indices were computed.
In the cyclists, the mean of all RR intervals between normal beats (meanNN), the SD of the RR intervals, and their coefficient of variation were significantly greater than in control subjects (p<0.01, p<0.01, and p<0.05, respectively).
For cyclists and control subjects, only meanNN correlated with left ventricular mass (r=0.48, p=0.038).
The heart rate variability indices that correlated with functional or metabolic variables were :
meanNN v E/A peak (the ratio of peak early and peak atrial filling rate) (r=0.48, p=0.039) ;
the root mean square of successive differences in RR intervals among successive normal beats v E/A area (ratio of peak early and peak atrial filling volume) (r=0.48, p=0.040) ;
percentage of successive RR intervals differing by more than 50 ms v the phosphocreatine to ATP ratio at rest (r=0.54, p=0.017) ;
and the SD of the average RR intervals during all five minute periods v the phosphocreatine to ATP ratio during stress (r=0.60, p=0. (...)
Mots-clés Pascal : Ventricule gauche, Masse, Homme, Imagerie RMN, Exploration, Fonction ventriculaire gauche, Cyclisme, Athlétisme, Rythme cardiaque, Variabilité, Entraînement physique, Phosphate hautement énergétique, Electrocardiographie, Métabolisme, Fonction myocardique, Médecine sport, Imagerie médicale, Electrodiagnostic
Mots-clés Pascal anglais : Left ventricle, Mass, Human, Nuclear magnetic resonance imaging, Exploration, Left ventricle performance, Cyclism, Athletics, Heart rate, Variability, Physical training, High energy phosphate, Electrocardiography, Metabolism, Cardiac performance, Sports medicine, Medical imagery, Electrodiagnosis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0312774
Code Inist : 002B30A03B. Création : 16/11/1999.