Influence of 2G-hypergravity on the right atrium secretory cardiomyocytes of rats

To elucidate the adaptation of secretory cardiomyocytes to the prolonged and repeated influence of changed gravity, a ultrastructural and morphometrical analysis of right atrium cells was made in rats after they were exposed to primary and repeated 2G centrifugation in a ground-based experiment. It was found that prolonged 2G hypergravity resulted in hypertrophy of right atrium cardiomyocytes and stimulated their mitochondrial associative activity and granular secretion; repeated influence-induced changes differed from those after single-influence changes.