[The electrophysiological parameters of heart functioning and the Ca-pump activity of the sarcoplasmic reticulum membranes of the suslik and rat myocardia during prolonged hypothermia].

At the rat body temperature below 19 degrees C, their heart modifies its action and preserves physiological properties. The heart resistance against cooling during prolonged sleep seems to be due to a high stability of Ca-pump SR membranes.