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Automatic LTHR detection does not work

Thom@s
over 1 year ago

Hi everybody,

     I have the following issue:


     For the last three training days I have been doing intervals where I have gotten close to my max heart rate. I'm using a Polar H10 chest strap, the time spent in each heart rate zone across the spectrum up to near maximum heart rate was sufficient to determine LTHR, I think. But there was no automatic lactate threshold detection during any of the workouts. The watch just didn't offer anything.

     Basically, I had no LTHR updates for a month. The last time the watch offered and Garmin Connect saved was 6/25/2023. Nothing since then!

     So I ask, does the automatic LTHR detection and updates work for you now?

Thank you in advance for the answer!

  • 0 over 1 year ago in reply to Thom@s

    I don't think it's as simple as x min in zone 5  or how close you get to max HR.

    If it doesn't change every time, it doesn't mean it's broken. But if you're training regularly and improving, I would expect it to occasionally trigger and give you a new LTHR (higher). Actually, if your performance compared to your current LTHR differs by a lot, I would also expect a new LTHR (lower). 

  • 0 over 1 year ago

    I finally got an LTHR autodetection today; my first in a while (although I only wear my chest strap for structured workouts, not for every run).

    Fearing that the newly accepted value would get stuck in limbo during syncing and not appear in Garmin Connect, I took the following steps that someone else had suggested :

    • I had been running without my phone. 
    • I stopped the run, accepted the new LTHR, and saved the run. 
    • I turned off my watch before getting within Bluetooth distance of my phone. 
    • Got home and turned off my phone.
    • Turned the watch back on and forced a sync over wifi directly from the watch. 
    • Checked Garmin Connect via my laptop and saw the new LTHR. 

    And it worked! Avoiding a sync over Bluetooth via my phone and forcing the watch to sync directly over wifi allowed the newly auto detected LTHR to make it to Garmin Connect!

    Baby steps.

  • 0 over 1 year ago

    For me it updates too often. 

  • 0 over 1 year ago in reply to jambongris

    Ahm.. You did not fulfill the essential point - you did not dance the shaman's dance with a tambourine. 

    Without a joke - No one step was really needed.  ;) Excluded wearing chest strap.

    It works every time if you stay in each HR zone for a min. 10 min.

  • 0 over 1 year ago in reply to global_local

    “It works every time if you stay in each HR zone for a min. 10 min.”

    Even in zone 5?! Can you post a link on where you found this info?

  • 0 over 1 year ago in reply to global_local

    I’m not sure why you think these steps weren’t necessary. The last 3 or 4 autodetected LTHR updates that I got on my watch never made it to Garmin Connect when I synced the runs over Bluetooth. Syncing directly from the watch over wifi is the only method that appears to work for me. 

  • 0 over 1 year ago in reply to kalamarios

    Simply do a guided lthr test. You'll see Slight smile May be not 10, but 6 surely. In the 5th zone.

  • 0 over 1 year ago in reply to jambongris

    Are you mean - was not transferred to the Garmin cloud from the watch? It was detected, displayed and acknowledged on the watch? But not transferred with a GC functionality? I fear there were some GC/cloud problems, not from frX55. For me there are only maybe the last 2 weeks, that were synced and displayed real data. 

  • 0 over 1 year ago in reply to global_local

    Correct. It’s been a known issue on the forums for quite a while now.

    There have been reports of two distinct issues:

    -autodetect LTHR stopped working 

    -autodetected LTHR values were not being synced to Garmin Connect after having been accepted on the watch.

    I can’t say for sure if I experienced the former but I think I did and I definitely still have issues with the latter. 

  • 0 over 1 year ago in reply to jambongris

    In my last run with the 955 ot detected LTHR. The problem is after that my Quatix7 stopped detecting LTHR!