[The cardiointervalogram indices of rats in relation to sex and estrous cycle phase].

Male rats manifested a lesser heart rate variability than the female animals. Optimal shifts of the heart rate mathematical parameters occurred in the dioestrus II and oestrus as compared with other phases of the ovarian cycle. Ovariectomy stabilised the heart activity, the effect being eliminated by administrations of estradiol.

[Behavioral "despair" in female rats and gonadal function].

In female rats various parameters and rhythmical structure of forced swimming underwent unsignificant fluctuations during estrus cycle. Ovariectomy changed the swimming time course and increased the rhythmical index of depression without other serious disturbances of the behavioural "despair" test. After chronic estradiol these shifts were partially eliminated.