Abstract des Autors

The aim of our study was to evaluate the endurance training effect on the heart rate. Before and after a 5 weeks aerobic training, we subjected 8 volunteers to a stress test and to a 24 hours e.c.g. monitoring to analyse the heart rate variability. Through this analysis we obtained a spectrum characterized by a high frequency band 0,25 (HF) mostly represented by the vagal tone and by a low frequency 0,10 Hz (LF) represented above all by the sympathetic tone. The training induced a significant performance improvement leaving the heart rate unchanged. Moreover modifications of the variability's analysis occurred either in the time domain or in frequency one characterized by: a general decrease in the variability of heart rate; a decrease of day-night excursion of the majority of examined parameters; a night decrease of the component HF's area together with the ratio LF/HF increase. Verf.-Referat