BUG: resetting HR zones overrides real max HR, too

From your description it does not look like the resetting of the HRZ changes your Max HR, or does it really? The Max HR value is on another screen, up the HR menu, so check the true Max HR value there.

From what I see it only changes the upper limit of Z5 to the default of 102% of LTHR, which gives 168 bpm in your case. I do not think it has any impact on anything, since on my mind the upper limit of Z5 is not being used at all, and everything above the lower limit (100% of LTHR) is simply Z5. However, on my watch, the upper limit of Z5 is set to 123% of LTHR, but it could be also 500% or whatever else.

So the reset in your case works as designed - sets the default values, and since the upper limit of the Z5 is set to 102% of LTHR, on your device, and the LTHR is 165 bpm, the result is correctly 168 bpm. The upper limit of your LTHR based table is not the 100% of Max HR, it is 102% of LTHR. Why it is so, I do not know - best you ask on the forum for your device(s), since the HRZ settings are device-specific, so you can ask there whether other owners have the same value of 102% as the upper limit of Z5 of the LTHR based table. However, as I wrote, I do not think this upper limit is being used at all, so you can quietly just ignore it.

From your description it does not look like the resetting of the HRZ changes your Max HR, or does it really? The Max HR value is on another screen, up the HR menu, so check the true Max HR value there.

It does change Max HR in GCM, but not in the watch.

I dont understand your second sentence, because all I wrote was about GCM, and in GCM in Heart Rate menu there is no absolute Max HR value, just the daily, weekly etc Resting and High HR values.

I changed the method from LT based to Max HR based to demonstrate what happens.

Before reset:

After reset:

From what I see it only changes the upper limit of Z5 to the default of 102% of LTHR, which gives 168 bpm in your case

So the reset in your case works as designed - sets the default values, and since the upper limit of the Z5 is set to 102% of LTHR, on your device, and the LTHR is 165 bpm, the result is correctly 168 bpm.

Unfortunately it is not the case. For your sake I played with my LT and iif I change it to any number less than 167, like 120 or 150, after the reset my max became 168 from 188.

If I set my LT in GCM to 168 or above, but less than 188, my max hr of 188 does not change.

So no rule of 102% exists in this case.

Btw since my OP my LTHR increased from 165 to 166, so 102% would be 169, and not 168

However, as I wrote, I do not think this upper limit is being used at all, so you can quietly just ignore it.

It may be true if you follow the based on  LT method, but if you follow the based on Max HR or HRR method than it does have an effect on all of the 5 zones.

What do you see on all three devices, when you go to the following path, before and after the reset? Do all of them contain 188 bpm before the reset and 168 after the reset?

GC app Menu » Garmin Devices Devices » device XY » User Profile » Heart Rate & Power Zones » Heart Rate » Max. HR 

(not the same screen as the HR Zones!!!)

BTW, just curious: why do you permanently need to reset the zones? I've set them once years ago, and did not need to reset them, since.

GC app Menu » Garmin Devices Devices » device XY » User Profile » Heart Rate & Power Zones » Heart Rate » Max. HR

Sorry, but you seem to confuse the menu structures. We both speak about  GCM IOS app, dont we?

In GCM IOS app the path you wrote is correct only to >> device XY, because after there is no User Profile, just User Settings >> HR Zones etc.

On my watches in the menu there is indeed User Profile >> HR & Power Zones >> etc.

And yes, after the reset and the proper syncs  both on my 2 watches and on my Edge MAX HR  value is ruined, it changes to 168 a in line with the new fake MAX HR is shown in Heart Rate Zones in GCM IOS app.

Can you send me screenshots where else you can change the max hr in GCM IOS than in HR zones? Because in my GCM IOS I never faced any other option just there.

I dont need to reset it regularly, but  sometimes I forget which are the original proposed % values of the zones.

My original, my primary sin :-) is that  play with the lower hr zones for the sake of  getting intensity minutes as correctly as I can manage it.

Alas my primary wearable, Enduro definitely underestimates OHR versus  the real and also  compared to my other watch (F6X), so occasionally I make some tests using a HRM-3 strap to see what offset there is approximately around the lower threshold of moderate and that of the vigorous IM zone. I use this standard “According to the Centers for Disease Control and Prevention, moderate-intensity exercise is 64% to 76% of your maximum heart rate and vigorous-intensity exercise is 77% to 93% of your max.”  evidently without using any upper threshold for vigorous. 

I am sure what my real max hr is since I made some real max hr tests, both for run and cycle, so I can properly calculate its 64% and 77%.

I put them as lower thresholds of Z1 and Z2, and tell GCM to use these two zones for IM (sidenote: my observation is that certainly not just Z2, but every other zones above will be part of vigorous IM calculation, sidenote 2: earlier when I used F6X as primary I used  Z2 and Z3 for IM zones).

Then the Enduro OHR offset test happens around the lower Z1 and lower Z2 values, thus I canmake the finetuning. 

When I have finished I am happy with it. :-)

But some time later I am just simply curious how much I distorted these hr values due to my abnormal wish to have correct IMs :-), so I push reset without (!!!) saving it. Just to see it.

I hope I could explain clearly. So this bug-wise thing is not a catastrophe for me, but from time to time I am facing it.

Tisztul_A_Visztula said:

Sorry, but you seem to confuse the menu structures. We both speak about  GCM IOS app, dont we?

Yes, we do, and I do have User Profile on the app. It may slightly differ according to the device you use. However, that's unimportant. What is important that you look up the Max HR value in the device settings of all devices that you own. One of them is apparently pushing back the wrong value to the others, so you need to find which of them it is.

On my Instinct 2 it is as follows:

I see, you have the same watch as user trux.

So  you can configure Instinct 2 in the same way as Fenix 6x and Enduro, but the structure and the name of those menus are different: