Dynamics of changes of the reduction functionalits and mechanisms of its regulation in small laboratory animals during adaptation to muscle training

Studies have been conducted to study the peculiarities of the development of the pumping function of the heart of immature rat pups exposed to various modes of physical activity at earlier stages of individual development. It was established that in animals kept in the mode of unlimited motor activity from 14 to 70 days of age, the heart rate and stroke volume of blood and the mechanisms of their regulation will change to a greater extent in the age range from 42 to 70 days of life. With systematic muscle training organized at the earlier stages of postnatal development of rats, the pumping function of the heart and the mechanisms of its regulation undergo significant changes at the initial stage, i.e. in the age range from 14 to 42 days of animal life.