[The action of strophanthin K and beta-acetyldigoxin in vitro on the energy transformation by the contractile protein system of the normal cardiomyocyte].

It was shown in experiments on myocardial fiber bundles (MGFB) from normal heart that strophantin K and beta-acetildigoxin in vitro in concentration of 10(-6) M sharply increased the value of force generated by contractile protein system and its ability to perform work. In this case strophantin K significantly increased energy transformation efficiency. It was concluded that in myocardial contractile protein system a regulator of qualitative and quantitative energy transformation is functioning (a kind of economizer).