Heart Rate Zone 3 in % of Lactate Threshold seems too narrow

Hi Folks

With a fenix 6s Pro and HRM-Pro I let Garmin detect my running LT and set HRZs accordingly. Zone 3 is set 88-89% (150-152bpm). Doesn't this seem too narrow for a zone to make sense? Or do I misunderstand something? The whole picture looks as follows (as created automatically by Garmin):

I know I can just overwrite it, but I'm hoping for some information if this makes sense or not. Please let me know if you have any experience with this. Thanks a lot, Daniel

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+1 Etupes25 over 1 year ago

Indeed, your zones are off. Can you reset them on Garmin Connect Web, or mobile or on the watch?

FYI: my default Garmin settings for % of LTHR are

Z1: 65-79%

Z2 80-88%

Z3 89-94%

Z4 95-99%

Z5 100- [HRMax / LTHR in %]

0 huerdan over 1 year ago in reply to Etupes25

Thanks a lot for your help. I probably should have tried that myself before posting, appreciate your reply even more so! After reset, my zones are very similar to yours:

Z1: 65-80%

Z2: 81-89%

Z3: 90-95%

Z4: 96-100%

Z5: 101-113%

This makes so much more sense. Thanks again and all the best, Daniel

0 huerdan over 1 year ago

Just as a follow up, after my Fenix 6 determined a new value for my running threshold, which I accepted, it automatically reset my % of LTHR and it again set Z3 very narrow at 85-87% of LT (147-149 bpm). If anyone has an explanation I'd be very interested. Thanks, Daniel

+1 Etupes25 over 1 year ago in reply to huerdan

I have seen cases on my watch where the heart zones get jumbled after a new threshold, or a change of heart zone method. It looks like there is some software bug.

So now I always reset my zones after making a change (eg LTHR or HR Max) and I leave the default %.

0 huerdan over 1 year ago in reply to Etupes25

Ok, thanks for letting me know, very helpful, probably a bug indeed, I'll do the same as you and just always reset manually afterwards.