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Never a high aerboic load in 4 week load focus on garmin FR745

I never get a high aerbobic load, but i am a 100% shure i am in that heart rate zone most of the times. it used to be the fullest bar on my watch, but since half a year or maybe even a year i can't get it filled up in any way (i also bought a  garmin edge 830 around that time and linked it to this account, don't know if that has anything to do with it. Does anybody know why this is happening? 

Garmin watch: FR 745  shows: 


Couple of the trainings in the last 2/3 weeks: 

Cycling training1

Cycling training 2 

A bootcamp training were connect garmin shows i was in high aerobic 

Watch settings:

  • i dont really understand your lasts sentance, but if you mean that if the training is not labeled tempo, high aerobic is stuck at 0. Then yes.  At least in my experience. 

  • no confusion.
    high aerobic was always stuck to 0
    anaerobic instead was filled

    after many tries, reset, firmware reflash, resetting zones ecc.. seems it was fixed to me, especially after resetting HR and WATT zones using % and leaving automatic calculations ON. 
    now high aerobic is filled and not stuck anymore to 0