... data from ectothermic and endothermic vertebrates, at rest and during exercise, with the goal of identifying key variables that may have contributed to the role of the cardiovascular system in supporting high rates of O 2 transport associated with endothermy. Vascular conductance, cardiac power...

... realistic assumptions of stroke volume and heart rate. This range of in vivo cardiac power output compares with the in vitro values of Smith (1985b) , who found the highest power output to be about 70x10∼ 6 Wg −1 , with an afterload pressure of 10 cmH 2 O and a preload pressure of between 4...