: Redline heart rate running Just started to use HRT monitor on runtastic. My max heart rate I think should be 179. I am 41 and my resting HR is 45. Just ran 15k this morning and according to the data I was in redline (defined

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220 - Age for maximum heart rate is one of the worst myths in sports. Your maximum heart rate may be less than 179, or it may be much more. For example, I am currently in my late 40's, and I regularly hit in the high 190's on hill sprint cycling workouts.

There are various step tests and self administered tests that you can do outlined on the web, I would encourage you to do one of these to see where you might fall.

I would say that with a resting heart rate of 45 and history of running 30-40k per week that 179 is probably not anywhere near your true maximum. It does suggest that you had some factors that were raising your heart rate, I would "expect" your heart rate to be in the 140's for a typical 15k effort, but that's a wild stab as everyone is very different in exercise response.

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I agree with doing a self-administered test. The tough ones aren't fun, but you'll know the truth.

Run a 5k race or time trial hard, running the last 1k-800m increasingly faster. Sprint hard to the end.
Find a long, hard hill (e.g., ~2 minutes from bottom to top). Run up it 2-3 times. Push hard as you get to the top.
Run 2km on a track, increasing pace with each lap. On the last lap, try to accelerate with each 100m section until you're running a full-out maximum sprint.

Obviously it helps if you have a training group or partner to help push you with one of these efforts. You should be able to take the max HR from a workout like this and add a few bpm to get a "true" max. (Let's assume that it's really hard to truly max out in a workout vs. a race.)

I'm 37 with a resting HR of ~40 bpm and found my max was probably around 175 bpm.

But I've used the various "training zone" percentage ranges and they match up really well with perceived effort. Take your real max HR and subtract your resting HR to get the "heart rate reserve" (HRR):

Zone 1: 60 to 70%; very comfortable effort; use this for warmup and cooldown
Zone 2: 70 to 80%; comfortable enough to hold a conversation; most training is done here
Zone 3: 81 to 93%; “comfortably hard” effort; you may be able to say short, broken sentences.
Zone 4: 94 to 100%; hard effort; the pace is sustainable, but conversation is a few words at a time. For most people this is around 5-K pace.

The key for me is that these threshold and tempo ranges match up really well with tempo and threshold workouts.