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Lactate Threshold not auto detecting for cycling?

What are the requirements for the watch to auto detect my LTHR for cycling?

I only do indoor cycling with Zwift. I record with Zwift and it auto sends the workout file to Garmin Connect. So I don't actually record anything with the watch directly. What's strange is that VO2 Max seems to update just fine.

0 oBuTTuSo over 2 years ago

I'm pretty sure your heart rate must be recorded by a Garmin device to have that calculated