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    Heart Rate Zone is Wrong

    Scheduled Pinned Locked Moved Suunto Race S
    heart ratechest strap
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    • Jordan ThetJ Offline
      Jordan Thet
      last edited by

      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!

      1000125011.jpg

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      • M Offline
        muellersjens
        last edited by

        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? Screenshot 2026-07-27 at 23.13.17.png.

        J S 2 Replies Last reply Reply Quote 1
        • J Offline
          johann.fuehrer Bronze Member @muellersjens
          last edited by johann.fuehrer

          @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…

          M 1 Reply Last reply Reply Quote 0
          • M Offline
            muellersjens @johann.fuehrer
            last edited by

            @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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            • S Offline
              snow* @muellersjens
              last edited by

              @muellersjens said:

              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?

              Race S Titanium
              SA on Android 17

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              • M Offline
                muellersjens @snow*
                last edited by

                @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.

                Mff73M 1 Reply Last reply Reply Quote 0
                • Mff73M Offline
                  Mff73 @muellersjens
                  last edited by

                  @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?

                  SSU (retired), SV1, SV2
                  Wife : S9PP
                  SA: Always the latest beta :)
                  Android + Galaxy S205G

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