HR and PwR zones

Spinning my wheels… my pwr and HR zones don’t make sense.

I’ve been doing a base training program for two months using training peaks. Requires many workouts in Z2. When I’m on the trainer I have a power meter. Based on my most recent FTP of 241, my Z2 is 135-182. When I set my my trainer to erg mode of 170watts, my HR hovers around 130 bpm plus or minus 5.

Now when I did my FTP test my Threshold HR was at 179… so when I set this up as my Threshold HR, my Z2 Heart Rate is supposed to be 145-157… a whole 15 bpm higher than what happens on my trainer at my PWR z2. Now, when I hit the road or trails with just my heart rate monitor, I have zero idea what zone I truly operating in.

Any advice? What am I missing here.

Thanks in advance!

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do a quick search in the forum. You will find a lot of threads covering this topic

Which HR system? Coggan has zone2 HR guidelines at 123-149 for 179 threshold HR:

HR has a lot of individual variation, and it also varies by whose system you follow.

Not unusual for power zone and HR zone to not agree.

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What test did you do for your LTHR?

That was totally it. Sticking with Coggan on both Threshold HR and Power made them line up. Thanks for the help!

I just used my twenty minute average HR from my FTP test. Is that accurate?

No it should be 95% of that number but it’s better to do a longer sustained effort. Friel says at least 30 mins and avg the last 20

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