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% of the zones are de-adjusted when a new lactate threshold is detected.

User Profile > Heart Rate and Power Zones > Heart Rate

Auto Detection: Yes

Threshold: Yes

Race zone: %LTHR

The percentages become unset when, after a workout, it detects a new lactate threshold and you click to accept it on the watch. You have to click on reset zones so that the percentages are adjusted again. Is it a bug?

0 Narziss over 1 year ago

Same here.

0 jambongris over 1 year ago

It’s been this way since I got my watch ~14 months ago.

I think it’s an intentional design decision so that users have to make an intentional decision to modify their HR zones.

While your LTHR pace should improve over time, your LT heart rate shouldn’t move around all that much so even if you forget to manually update your zones it shouldn’t make much of a difference.