# Treshold HR is not updating Zones automaticaly **URL:** \ **Category:** Bug Reports\ **Created:** [30 October 2021 01:39 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166 "2021-10-30T01:39:22Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Lukasz\_Pludowski](https://forum.intervals.icu/user_avatar/forum.intervals.icu/lukasz_pludowski/32/26142_2.png) [@Lukasz\_Pludowski](https://forum.intervals.icu/u/Lukasz_Pludowski)\ **Post date:** [30 October 2021 01:39 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/1 "2021-10-30T01:39:22Z")
Hi, If you change your tHR, the Zones stays the same unless you specifically enter the HR Zones settings menu and choose a preset. It’s very easy to forget about it and train with wrong HR Zones. The way it works with Power Zones (automaticaly calculates zones) is much more user friendly 😀 cheerz ---
**Author:** ![sakumatti](https://forum.intervals.icu/user_avatar/forum.intervals.icu/sakumatti/32/63306_2.png) [@sakumatti](https://forum.intervals.icu/u/sakumatti)\ **Post date:** [3 November 2021 18:25 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/2 "2021-11-03T18:25:31Z")
I noticed the same yesterday evening. It was unintuitive to me as well. ---
**Author:** ![thrstn](https://forum.intervals.icu/user_avatar/forum.intervals.icu/thrstn/32/26313_2.png) [@thrstn](https://forum.intervals.icu/u/thrstn)\ **Post date:** [12 December 2021 18:24 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/3 "2021-12-12T18:24:26Z")
Same here, i updated my tHR and found out, that not the Heart Rates updated. It updated the Percentage of the give values acc to the new tHR or HR max. That´s a big mistake. The definitions of the training zones should not changed. instead of this it have to change the HR´s acc to the planed zones (% of tHR/HRmax). Big problem is, if you don´t have saved the given values of %tHR or written down on a note you lost your zones definition. ---
**Author:** ![david](https://forum.intervals.icu/user_avatar/forum.intervals.icu/david/32/30189_2.png) [@david](https://forum.intervals.icu/u/david)\ **Post date:** [13 December 2021 18:04 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/4 "2021-12-13T18:04:36Z")
I understand the problem now. I will sort this out. Tx guys. ---
**Author:** ![david](https://forum.intervals.icu/user_avatar/forum.intervals.icu/david/32/30189_2.png) [@david](https://forum.intervals.icu/u/david)\ **Post date:** [13 December 2021 18:50 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/5 "2021-12-13T18:50:41Z")
HR zones will now automatically recalculate to keep the same percentages of LTHR when you change LTHR. I will deploy this change Tues AM (GMT+2). ---
**Author:** ![thrstn](https://forum.intervals.icu/user_avatar/forum.intervals.icu/thrstn/32/26313_2.png) [@thrstn](https://forum.intervals.icu/u/thrstn)\ **Post date:** [14 December 2021 06:32 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/6 "2021-12-14T06:32:27Z")
Great and fast support, thx ---
**Author:** ![barryl](https://forum.intervals.icu/user_avatar/forum.intervals.icu/barryl/32/26576_2.png) [@barryl](https://forum.intervals.icu/u/barryl)\ **Post date:** [9 June 2022 16:22 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/7 "2022-06-09T16:22:34Z")
Is there a way to update the tHR for a historic activity? I realized I’ve done a week of runs with my zones not updated, and I’d like to go back and fix them if possible. ---
**Author:** ![MedTechCD](https://forum.intervals.icu/user_avatar/forum.intervals.icu/medtechcd/32/40383_2.png) [@MedTechCD](https://forum.intervals.icu/u/MedTechCD)\ **Post date:** [9 June 2022 16:44 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/8 "2022-06-09T16:44:11Z")
You should be able to do that following this procedure for tHR iso HRmax: > [@Heartrate spikes now automatically fixed](https://forum.intervals.icu/t/heartrate-spikes-now-automatically-fixed/174/16): > > Would this work? Set your HRmax at higher value in settings and on the activity page of that older workout, choose “Update Zones”. Then set your HRmax back to todays value to reflect what it is now. If I interpret this correctly, only the older workout will have the higher HRmax set. On the activity list view, you could do this for a series of activities. ---
**Author:** ![Roberto\_Herradura](https://forum.intervals.icu/user_avatar/forum.intervals.icu/roberto_herradura/32/28478_2.png) [@Roberto\_Herradura](https://forum.intervals.icu/u/Roberto_Herradura)\ **Post date:** [11 June 2022 11:34 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/9 "2022-06-11T11:34:35Z")
Newbie here. Are HR zones based on tHR instead of mHR ? My last zone is over 100% Thanks ---
**Author:** ![david](https://forum.intervals.icu/user_avatar/forum.intervals.icu/david/32/30189_2.png) [@david](https://forum.intervals.icu/u/david)\ **Post date:** [12 June 2022 04:54 UTC](https://forum.intervals.icu/t/treshold-hr-is-not-updating-zones-automaticaly/5166/10 "2022-06-12T04:54:03Z")
Yes HR zones are displayed as percentages of LTHR.