Level 6 Valued Member
I didn't think about this in particular, but it does make sense. My thoughts behind my "HR isn't the only thing that matters" statement were more along the lines of the body's response to blood flow restriction. With a set of three deads, I'm remaining very tense for 10-15 seconds. During that time my body is breaking down PCr, and producing some waste products that require oxygen, and just blood flow in general, in order to deal with properly. After the set is over, I have all this junk that needs to be redistributed, in addition to PCr that needs to be restocked. The increase in HR is not only due to a need for oxygen, but also the fact that my tissues weren't adequately perfused with blood for 10-15 seconds. It's worth noting, as above, that this increase in HR is likely going to be mediated by adrenaline (as are most increases in HR).When you're lifting, the heart rate goes up for a completely different reason. You're releasing catecholamines, i.e. adrenaline.
With KB ballistics, I think the tense/relax cycle allows the body to circulate blood more effectively during the exercise, so the HR one gets in response to it has less to do with compensating for temporarily restricted blood flow and more to do with the actual oxygen demand.
I think we can safely say that the need to get rid of waste and take in oxygen is a driver for increased HR with regard to both ballistics and grinds. We could theorize that, relative to each other, the increase in HR from ballistics is more from the need for oxygen, and the increase in HR from grinds is more from the need to clear out waste. Of course, that's hard to prove. Muscle biopsies, anyone?definitely think the HR goes up to provide fuel and remove waste.
But yes, @Anna C I would agree that a straight across comparison of the two using just HR, though not useless, is of limited usefulness.