Heart Rate Reserve (Karvonen) and Power (Stryd)

[Pierre_L]

Hi.

I used to use the 5 Karvonen Zone for the HR based on HRR.
Z1 : 0-60
Z2 : 60/70
Z3 : 70/80
Z4 : 80/90
Z5 : 90/100

Idem for the power, I use the same distribution as Stryd based on Critical Power
Z1 : 0/80
Z2 : 80/90
Z3 : 90/100
Z4 : 100/115
Z5 : 115/130+

How can I configure them for my running activities ?

Thank a lot

[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]

[Pierre_L]

Thank you. It’s what I am still doing. I wonder if it’s possible to have a solution to have everything automatically but it seems to be unpossible for moment.

[CoachP]

There is a preset for Stryd Run 5-Zone in power zone FTP settings.

[Christian1]

I guess the answers don’t help so far, because it’s not only about setting up percentages per zone.

I have basically the same requirement using HRR (hear rate reserve) or Karvonen zones (only different names for the same).
The formular is the following:
restingHR + (maxHR - restingHR) * zonePercentage

So it should be easy to understand, why it’s currently not possible in intervals.icu to use it. @david would need to implement the calculation, so that the factor applies at the correct position.

Some background why it’s important for me:
after a longer recovery phase about 4 weeks I’m totally out of shape (always crazy to see, how fast detraining kicks in ). It doesn’t make sense to test myself for threshold HR - because I’m not fit enough.
So basic endurance is the key for building up fitness again. For that I usually take HR instead of pace/power, especially for Zone 1 efforts (3 Zone model)
My resting HR really went up by around 10 beats, so Karvonen reflects this and my Zone 1 got reduced, which is what I feel as well.
If I would use one of the templates in intervals.icu, I can just base on either maxHR or THR. maxHR is obiously the same like 4 weeks ago - and THR isn’t realistic, as I already pointed out.

That’s only an obvious use case, showing the difference of both approaches. When I’m back in shape (soon ) then the difference between Karvonen and a “classical” method is quite low.