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    Heart rate strap pairing failure and incorrect zones before and after app reinstall

    Scheduled Pinned Locked Moved Suunto app and other software services
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    • Cassandra RempelC Offline
      Cassandra Rempel
      last edited by

      I’ve been using a Suunto Smart Heart Rate Strap for about 18 months.

      From early on, the app calculated heart rate zones incorrectly, setting Zone 2 at ~134 bpm. Zone 2 should be ~60–70% of true max HR, which for me is around ~112 bpm. I contacted Suunto support multiple times but received no useful guidance or explanation.

      Eventually, uninstalling and reinstalling the app was suggested as a fix. After doing this, my heart rate strap can no longer be paired or synced at all.

      Before the reinstall, the zones were wrong but the strap worked and I could manually calculate correct zones.

      After the reinstall:
      The strap will not sync or pair
      The zones are still incorrect with no way to correct them
      I lost 18 months of data

      There is no visible way in the app to re-pair or reset the strap. I know the strap itself works; this appears to be an app-side issue with zone calculation and pairing state. Is there any way to fix this? Or, should I give up, purchase from a different company and be more cautious about software and interface design.

      Brad_OlwinB sky-runnerS 2 Replies Last reply Reply Quote 0
      • Brad_OlwinB Offline
        Brad_Olwin Moderator @Cassandra Rempel
        last edited by

        @Cassandra-Rempel Can you provide a bit more information? Are you using a watch or only the Suunto App? The HR values are set in the watch and then propagated to the app.

        Vector/T6c/Vertical 2 Ti

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        • sky-runnerS Online
          sky-runner Platinum Member @Cassandra Rempel
          last edited by sky-runner

          @Cassandra-Rempel said in Heart rate strap pairing failure and incorrect zones before and after app reinstall:

          Zone 2 should be ~60–70% of true max HR,

          This isn’t true. Zone 2 should be where the aerobic threshold is, and for different people it can be at different percentage of max HR. For example, for me the top of zone 2 is at about 80% of my max HR. The more aerobically fit a person is the higher aerobic threshold is.

          Suunto: Ambit, Ambit 3 Peak, 9 Baro, Race S, Race Ti, Vertical 2 Ti
          Garmin: Forerunner 210, Forerunner 610, Fenix 6X, Fenix 7X Ti

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          • 2 Online
            2b2bff Silver Members @sky-runner
            last edited by

            @sky-runner Max HR is irrelevant, lactate threshold is. And as Max HR doesn’t change, but thresholds are, your statement is correct…

            https://www.suunto.com/de-de/sports/News-Articles-container-page/Figure-out-your-training-zones-and-supercharge-your-fitness/

            Zone 5: Above your anaerobic threshold. Zone 5 ends at your max heart rate
            Zone 4: 94–99 % of your anaerobic threshold. The upper limit of zone 4 is your anaerobic threshold
            Zone 3: 89-93 % of your anaerobic threshold
            Zone 2: 83-88 % of your anaerobic threshold. The upper limit of zone 2 is your aerobic threshold
            Zone 1: <82 % of your anaerobic threshold. Zone 1 starts at your resting heart rate.

            Race S

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