Stidierea ritmului cronobiologic al activităţii cardiace la femei sănătoase cu evoluţie fiziologică a sarcinei s-a efectuat prin metoda electrocardiografiei timp de 24 ore la ora 7, 11, 15, 19, 23, 2. Ritmul 24 ore a activităţii electrice a cordului în perioada sarcinei fiziologice se caracterizează prin scădere dimineaţa (ora 11), seara (ora 19) şi noaptea (ora 2), iar după masă (ora 15) şi seara (ora 23) – prin sporire a funcţiei cardiace.

The study of the chronobiological rhythm of the cardiac activity in healthy women with a physiological pregnancy evolution was performed through the method of electrocardiogram during 24 hours at 7, 11, 15, 19, 23, 2 hours. The rhythm in 24 hours of electrical activity of the heart during the physiological pregnancy is characterized by the declining in the morning (11 hour), evening (19 hour), and at night (2 o’clock at night), and in the afternoon (3 o’clock in the afternoon) and in the evening (11 o’clock) through the elevation of the cardiac function.