[Differences in the redistribution of cardiac output during hyperthermia in waking rats and guinea pigs]

The heat stress induced common responses in rats and guinea pigs: an increase in the blood flow at the sites of heat radiation and in the diaphragm, and its decrease in splanchnic area's organs and in kidneys while cardiac output remained constant. The species differences occurred in the responses of intestine and skeletal muscles' vessels. The differences seem to be due mainly to the differences in behavioral responses to the heat stress in these animals.