Heart Rate Reserve (Karvonen) and Power (Stryd)

[Gerald]

Hope this helps you.
My post (second last) explains how to use a custom setup in Hr and Power zones.

Custom Heart Rate

I would appear that the 0 value, as well as the maxHR is not editable; at least from my attempt. The zone value is based on your maxHR, while the % would be against your LTHR. I would use the 80/20 rule, and set up your 5 zone setup using those 5 fields labelled 2-6. You can rename them as I have in this example: [image]