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Sudden pulse jumps

Yesterday, my wife's and mine heart rate suddenly jumped to over 160 at the same time. For no reason whatsoever. A high pulse alarm has sounded. We did nothing at the time except sitting on the couch. We measured the heart rate with a blood pressure monitor and it was normal, and the watch only after taking off and waiting a few minutes began to show a normal heart rate. Today the situation has repeated itself. We both have Forerunner 945. What can this result from and why is it happening on both watches at the same time?

0 Zenginerd over 5 years ago

Happens to me almost everyday. No idea why. Different times, always sitting.

0 2goBeyond over 5 years ago

Well, just for clarity, optical heart rate monitors, of any kind, are not reading your pulse. They are guessing your HR based on blood flow under your skin.

Could you maybe been sitting where the circulation of blood to the area was cut off, only to have flooding of blood back to the area (like having your arm pinned under you for an elongated amount of time?)

How tight you have the watch on could be a factor since having it too loose and allowing external light to flood in could give you odd results. Dirt could play a factor, or it may have a crack in it.

0 6338356 over 3 years ago

I know this is an old post but I respond in case someone else finds it useful. Do you use a chest strap at all? The only time I've had simultaneous changes for both me and my partner was where by mistake both of our watches locked onto the same chest strap signal. And last night I was awakened by a pulse-too-high alarm that shot from resting to over 195 almost instantly-- after confirming my actual pulse was at rest, It took a restart of the watch and putting on the chest strap to get the spike to stop. I'm thinking some sort of residual signal may have come from the chest strap brick sitting by itself on a shelf though I can't imagine how-- vibration from a passing truck? Here's hoping it doesn't happen again.