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? 

Parents
  • I just discovered this forum.  I have experienced similar problems with HR ramping up around the time I get warmed up.  Sometimes it goes really high and stays that way even though I'm trundling along at 2-4RPE.  It's annoying as VO2 max gets busted down and I'm told to take several days off training.  I have wondered if something like light, sweat, strap tightness or arm movement affected this but have not found any obvious reason or reliable method to seemingly correct this.  Depending on length of run I sometimes see HR drop down to what I would expect a way into the run.  has anyone heard from Garmin on this?

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  • I just discovered this forum.  I have experienced similar problems with HR ramping up around the time I get warmed up.  Sometimes it goes really high and stays that way even though I'm trundling along at 2-4RPE.  It's annoying as VO2 max gets busted down and I'm told to take several days off training.  I have wondered if something like light, sweat, strap tightness or arm movement affected this but have not found any obvious reason or reliable method to seemingly correct this.  Depending on length of run I sometimes see HR drop down to what I would expect a way into the run.  has anyone heard from Garmin on this?

Children