The phase analysis of cardiac activity in a person under gradual increase of intrapulmonic pressure

The dynamics of phases and periods of cardiac cycle in a group of young women have been studied under dosed gradual increase of intrapulmonic pressure. It has been shown, that under the given conditions the phase of asynchronous contraction dose-dependently increases, whereas phases of isometric contraction, ejection period and the duration of cardiac cycle decrease. Possible mechanisms of mentioned shifts are discussed.