Annual Electrocardiogram Cycle in Women of European North
We consider features of electrocardiogram (ECG) in 12 leads in the annual cycle in normotensive 20-59 year-old women living in the European North almost all their life (62°N). We demonstrate the modulating effect of the weather and climate conditions on the amplitude and time characteristics of the ECG. The periods of unfavorable influence of the weather conditions on the electrical activity of the heart muscle are revealed.