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Consistent issue with HR spiking after approx 7 to 10 minutes on 935

My very fit and competitive 12-year old runner experiences a consistent issue where her Garmin 935's HR data show a dramatic bump up at around 7 to 10 minutes into what is an otherwise easy (5/10 effort) long run, and then stays high. It does not correspond to her perceived effort at all. Any ideas? This is happening both when worn by itself as well as when using a chest strap.

At the same time, the Performance data doesn't kick in until right after this big bump. Is that by design?

0 5432785 over 3 years ago in reply to martin_harris

Martin - I did find this article, but no solution. What we're experiencing is exactly what you're describing. So annoying! https://support.garmin.com/en-US/?faq=xQwjQjzUew4BF1GYcusE59

0 AlmaataKZ over 3 years ago

I have had similar behaviour, but using chest strap resolved the issue.

0 5432785 over 3 years ago in reply to AlmaataKZ

we've tried it with chest strap and it was still happening. However, I'm wondering if it toggled back to picking up from optical watch rather than chest strap or I never set it up correctly (I know it's picking up running dynamics that don't show up without the chest strap in use...). Have you seen any issues with the chest strap not consistently reading? (I should mention that my daughter is tiny and I even had to shorten the strap since even the smallest setting was too long for her; we're obviously doing all the regular stuff, properly wetting the sensors, etc. ).

0 Ollypsilon over 3 years ago in reply to 5432785

Well, did you check with a cardiologist? One mate had some additional "leads" (*) in his heart which caused this kind of readings in ECG, so also chest straps. A "catheter ablation" was made and then all was fine. His heart rate strap just discovered this, cause was something else and more serious.

(*) sorry, I don't know the correct english term.

0 nradov over 3 years ago in reply to 5432785

Try a totally different chest strap heart rate monitor from a different manufacturer to see if the problem is reproducible.