Ventricular ectopy frequency and complexity not altered by exercise training in coronary disease patients

To assess the effect of exercise training on ventricular ectopy in coronary artery disease patients, 21 patients with coronary disease had 24-hour ambulatory electrocardiograph recordings done at entry into a cardiac rehabilitation program and after 6 months' exercise training. Mean frequency of premature ventricular contractions was not significantly changed, being 9.7 ± 33.0/h before and 13.2 ± 94.3/h after training. 9 demonstrated an increased, 9 a decreased, and 3 an unchanged frequency. Low grade of ventricular ectopy was similarly not consistently changed with training.