[Autoregulation and dilatory reserves of the rat coronary arteries upon limiting their motor activity]

The influence of 6-hr immobilization stress on the autoregulation reserve of coronary vessels was studied in 45 isolated hearts of white female rats. The ability of coronary vessels to resist against intravascular pressure decreased in early post-stress period, the relationship between the coronary flow and the contractile activity being disturbed. The stress seems to decrease the basal tone of coronary vessels, thus leading to a superfusion and a decline in coronary reserve.