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Good evening everyone, I have a question regarding my maximum heartrate which I wondered whether anyone could answer.
I know the formula of 220 - age, 46 for me gives me 174. Last summer though, my Garmin measured me a max figure of 185 (although to be fair I was trying to run up a mountain at the time!). I have downloaded a HR half-marathon schedule off this site and I put in 185 as my max HR. I have to do intervals at 97-99% max HR and I just cannot seem to get my HR up to 185 now. When I hit 170 I really really feel the need to stop! Is this because I'm getting fitter so my max is lowering or am I just being lazy?
I started running in feb last year and have gone from 30 secs of running at a time to being able to run for a couple of hours so I guess you could say I've improved some (looks around proudly )
If it helps, my resting HR is 47.