Originally Posted by
asgelle
In what way is blood pressure equivalent to stroke volume? It should be obvious that the two are different just by looking at the units. The first is measured in force per unit area and the second as volume or length cubed.
Think of it this way, keep heart rate and stroke volume the same - will the amount of blood circulating change with the elasticity of the heart or diameter of the aorta?
Oh, we are going off on a related technical subject, eh? I never said it was the equivalent. Although the heart has only Rate and Pressure to work with stroke volume, of course, is affected by external factors such as Preload, Contractile Force and Afterload. So, although it is true that the ultimate technical stroke volume is the result of all the forces for this sub-set discussion on the heart alone it is Rate and Pressure.
The OP and subsequent discussion focused on Heart Rate as a reflection of fitness. That is where I'm focusing my comments.