[Energy homeostasis and natural biological models].

Phase analysis of cardiac cycle was performed in normal subjects of both sexes aged 18-20 years at winter and summer seasons. It was found that the energy dependent systolic phases (isometric contraction, period of expulsion) have a definite continuance in connection with energy background, typological and sexual features of the homeostasis. The data evidence that the systolic phases can be considered as informative model for the study of energy homeostasis.