Heart Rate Zone is Wrong
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Hi all,
I recently wore the race s with the polar H10 chest strap to do some intervals.
Strangely the heart rate graph shows some believable heart rate trend, but the zones do not seem to correlate.
I was wondering if anyone knows why?
Thank you!

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Almost 2 years later and I see the same discrepancies. Might be a coincidence but I use the H10 as well. Suunto says I was in Zone 1 during 36% of the activity - I was constantly above, even when I started. The line chart (and the Laps section) seems to tell the true story here, despite some signal drop outs (was a hot day). In line with this Zone 1 haluzination, Suunto calculated an average heart rate of 127 which is absurd too given the line chart.
Any idea where this is coming from and when it will be fixed?
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@muellersjens I have a Vertical 2 ant there are two kind of HF Zones possible. An overall one and one for dedicated sports like running. Can you check if you see the same in training settings and if the HF zones match? Just an idea…
And the app also has MaxHR & RestHR settings, maybe they play a role as well…
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@johann.fuehrer thanks for your hint. The HF Zones are correct. I only use slightly different ones for cycling - this was a running activity just like any other. I had another run after this one and at least the error didn’t repeat.
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Any idea where this is coming from and when it will be fixed?
Same watch and same sensor and no issues here.
Is the H10 battery OK? Is the chest strap worn out? -
@snow happy to hear that
Yes all good. Maybe sweat and dropouts might play a role in this but this still doesn’t explain why Suunto interprets that one signal in different ways. Btw. I had two runs since then and the error didn’t repeat. -
@muellersjens
Did you check again your previous activity in the app?
HR is computed in the backend and sometimes it doesn’t appear good initially (if appearing at all).
After this, what is saying your watch logbook for zones duration for this activity? Correct or same discrepancy?
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