[The effect of opiate receptor ligands on emotional cardiovascular reactions in lower primates].

Intravenous naloxone injection (0.1 mg/kg) facilitated blood pressure increase in response to conditioned sound stimulus followed by electrocutaneous shock in conscious chair-restrained baboons (Papio hamadryas). Naloxone at a dose of 1.

[Participation of the endogenous opioid system in the formation of the body's response to stress].

Autonomic responses to acute stressors in unanesthetized, chair-restrained baboons and macacas include elevations in heart rate, blood pressure and respiratory rate. Naloxone, in a dose of 1.0 mg/kg intravenously, as well as morphine (1.

Blood pressure in monkeys chronically exposed to psycho-emotional stress.

The influence of experimental neurosis due to repeated conflict situations on blood pressure was studied in male monkeys. All animals developed hypertension demonstrable in the conscious state but which disappeared under pentobarbital anaesthesia. Both in conscious and anaesthetized animals, the pulse pressure was in-elevated.

[Beta-endorphin-like immunoreactivity of the blood plasma of hamadryas baboons and its changes].

It was established that plasma level of beta-endorphin-like IR in baboons (Papio hamadryas) was 8 +/- 1 fM/ml, and of beta-lipoprotein-like IR- 9 +/- 1 fM/ml. Ratio between beta-endorphin-like and beta-lipoprotein-like IR was 0.9 +/- 0.

[Effect of motor activity on the development of arrhythmia in experimental emotional stress].

Studies on monkeys and rabbits have shown that the experimental emotional stress can produce various disorders of cardiac rhythm: sinus tachycardia, atrial fibrillation, ventricular extrasystoles and paroxysmal ventricular tachysystoles. In these conditions the adrenaline content in the blood and myocardium is increased 3-4 times, the noradrenaline level is raised in the blood and decreased in the myocardium. Moderate motor activity leads to a relative decrease of adrenaline in the myocardium and arrest of cardiac arrhythmias.

[Cardiac contraction frequency in Macaca rhesus monkeys occupying different position in a group hierarchy].

Four variants of heart rate ratio were revealed in 8 groups of the monkeys of different hierarchic positions. Dependence of the heart rate in low-ranking monkeys on the character of their interrelationships with the dominant individual, was shown. The lowest heart rate was revealed in the monkeys protected by the drominand individual.