Effects of Dosed Physical Load on a Bicycle Ergometer on Electrocardiographic Parameters

Physical activity induces acute and chronic adaptations in cardiovascular function, which can be objectively evaluated using electrocardiography (ECG). The objective was to investigate changes in heart rate (HR) and R-R interval following primary and repeated bouts of dosed physical load using a bicycle ergometer. Four healthy male adults (22-27 years) underwent ECG recording at rest, immediately after a 10-minute cycling bout, after 5 minutes of recovery, and again following a second cycling bout after a 30-minute rest. Mean HR and R-R intervals were analysed using descriptive statistics and significance testing (p < .05). HR increased significantly after the first physical load and demonstrated a comparatively attenuated response during the second load, suggesting early cardiovascular adaptation. The R-R interval decreased with exercise and gradually returned toward baseline during recovery. Repeated aerobic physical load results in measurable autonomic and cardiac adaptations, reflected by moderated HR response and recovery of R-R intervals. These findings support the role of regular aerobic activity in promoting cardiovascular efficiency.