[Dependence of the degree of cardiac stress damages on the change in the endogenous beta-endorphin level during preliminary adaptation].

It was found that simulation of stress of the white rats increases the myocardial uptake of Tc-99m-pyrophosphate (Tc-pyp). The before-adapted group of animals had a sufficiently lower content of Cc-PYP in myocardium, than the stress-control group. At that time, the before-adaptation led to a low rise in the plasma beta-endorphin and to a significant rise in its quantity. The authors discuss the role of endogenous beta-endorphin in the mechanisms of the protecting effect of adaptation.