Not long ago, I tested my max heart rate at around 206 using a nice chest strap.
I just got a GPS watch with an optical heart rate measurement and thought I'd ditch the chest strap. It seems to be reasonably accurate when I'm running at a moderate pace, but any time I do hard intervals the rate often reads even slower than my moderate runs - it seems to have no accuracy whatsoever with faster running. Has this been the case with other people?
This seems to be the case with pretty much all the optical HRs out there. Great for easy aerobic days, pretty darn good for fast tempo, but changing paces quickly, no good.
For me this is totally fine as I run easy, long, and tempo days based mostly on HR, but I do intervals based either on effort or time, and I don't look at HR at all.
Thanks for your response. Yeah, for tempo I get what seem to be appropriate heart rate readings in the range of high 160s to mid 180s, but for my hard intervals - even mile repeats - I get in the 150s and 160s.
From everything that I hear, optical hr is unreliable.
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