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HR issue

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 ran a half marathon pace 99% hr zone 4. After update ran intervals at faster paces and didnt even reach hr zone 4 and I was definately i zone 5...

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  • 0

    Another forum member said that the watches in the new software versions use an average heart rate over several seconds. This of course makes the evaluation of interval training worthless. I have no guarantee for this statement, but I have the same problem with my 255. Sprint inserts have recently been completely ignored by the heart rate monitor.

    Just buy a chest strap. Sincerely, your Garmin sales agent /s

  • +1

    I'm sorry to hear about that. Please see 18.20 HR bug still here for the main thread regarding this topic.