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Sounds feasible. When I was last in the habit of using HR data, my highest observed max was 202, hard intervals would get me to low-190, and low-170 would be somewhere between marathon and HM intensity - probably not far from "moderately hard 10k" intensity.
Not that I would use HR during interval training, cos it's too variable. But useful to look at afterwards, e.g. HR coming down at a quicker rate between reps being a potential indicator of improved fitness.
I'm pretty confused by the data from my interval training. It was also hard to follow the instructions from my watch as I was doing it.
My top heart rate was 192. If I add 10, then my moderately hard 10k at 173 average would be 86% of max heart rate, can that be right?