At the beginning, in order to deliver blood to the moving skeletal muscle, the heart needs to speed up the heartbeat to increase blood supply to meet the blood supply demand of the muscles during exercise. So the reason why the heart rate rises faster at the beginning of skipping rope.

After a period of exercise and sufficient blood supply, the blood supply capacity of the heart is relatively stable, and the change of heart rate is relatively small, even slightly decreased. This is also the reason why the heart rate will drop after skipping rope for ten minutes.