just another gosling
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Mentioned: 18 Post(s)
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MMM. My Polar predicts my MHR 4 beats too low. Still, that's close. Some days I can't get it over the Polar prediction. The only way I can reach MHR is to climb really hard at about 95% of MHR for at least 10 minutes, then come out of the saddle and really blast it. I can't come anywhere near that on the trainer. That said, my MHR and LT vary all over the place depending on my training load and where I am in the cycle. After a really hard double, my MHR and LT are about the same, about 90% of normal LT.
So like Bici3 said, I try not to obsess about it. Still, one wants zones. I use my "fresh" LT, which is 92% of my "fresh" MHR. That works out. When I'm feeling good, I can climb for an hour at that LTHR. And using zones based on that HR doesn't seem to overtrain me.
This works out for me, even when my systems are shot after a major ride. I'm mostly doing recovery and endurance rides during the next week, and those lower HRs seem fine to use for those purposes, even though the higher HRs are not available to me - unattainable.
As far as running and cycling MHRs are concerned, I'm not a runner. No experience.