Lactate Threshold

Quick question on this. I did a 2 mile brick run last night having cycled for an hour beforehand. I'm not the best of runners, wasn't going all that fast, and tried keeping my heart rate below 165 (I think my max is around 185).

Anyway when I finished, I noticed the F5 saying it had detected my LTHR as 165 @8:15m/mile. I've read about doing the correct 20 mins faster pace test to determine this value, so because I wasn't stressing myself as much as I could be, is it likely this number (and the zones) the watch has now set are wrong and probably reading a bit low?

I'd imagine I would be at 175bpm doing approx 7:45m/mile at a sustained 20 minute pace if I retested and sped up.

In the user profile my max is set to 185bpm, LTHR 165 and resting HR is empty. I haven't set any of these on the watch.

0 C966 over 7 years ago

Also just noticed this bug - my LTHR was set to 165 as expected but I decided to change the zones to be calculated using my max HR and once this saved my LTHR had changed to 74 and resting 30 :-D

I've since set manually on F5 and GC and kept the zones to use max HR and after a few syncs the numbers are still there. Great success. Does anyone know if Garmin are aware of the LTHR/Resting HR bug? If not, I'll fire them over an email.

I would think they do since it has been discussed before here but would not hurt to send them an email, the more people the more importance they give it.

0 psymon over 7 years ago

Guys just did a guided lthr test on my fenix 5 using an hrm run and got very strange results. The lhtr shown on the device is 74 bpm! The pace is a more reasonable 5:27 min/km. Am 38, with a max heart rate of 184, and a vo2max of 47. HELP!

Sorry for the update of the old thread, did you ever get a resolve to this, as it's just happened to me?

thanks