You kind of lost me there Chris.Even using 220 - age, which my Polar HRM is set to by default, that still leaves me with a MHR of 163. That is sufficiently anaerobic that I am panting after a few hundred yards of that level of exertion!
I've yet to find a way to adjust the MHR setting on the Polar to reflect my reality rather than some arcane formula!
I'm intrigued by the difference in recorded energy expenditure based what "MapMyRun" guesstimates and the reading off the Polar. The Polar will typically be between 50% and 70% of the MMR number for any given run with my LSD runs being the lower percentage.
Just curious, why are you keeping track of this? You seem to know your way around your paces and distances, and that's all that really matters, right? All the numbers, formulas, monitors, and measures are just an aid to help us internalize a good feeling for our paces, so we know how far we can run. That is, at x pace, I can go y distance. Or I can go y distance at x pace. That's all running really is, it seems to me. Everything else derives from that. For example, why is good form important? So you can run the same distance faster, or the same pace farther, because you're more efficient. OK, it also helps prevent injuries, but why is that important? So that you can train consistently so that you can run x pace or y distance. You seem like you've already got this stuff down. For me, this is my goal for the coming year, beside improving my running fitness generally. I want to know what my 1 mile pace feels like, what my 5 k pace feels like, what my 10 k pace feels like, adjusting, of course, for temps and terrain. When I can say, OK, here's my 8mm or 9mm pace, or, in more subjective terms, here's my fast or medium pace, and I know I can run distance x at this pace, I will feel like a more accomplished runner. Just as right now I can tell you, OK, this is my max bench, or this is my max deadlift, or I can do x reps at y weight. Once you control these factors, you start to gain a certain mastery over what you're doing, which seems to improve the experience and may translate a bit into other areas of life. Previously when I ran I just did the same distance, gradually improving, but had no real concept of pace. Is it necessary for recreational running? No, but it seems to be enriching the experience for me, just as barefoot running has.