I'm trying to pay more attention to my heart rate. Though I've never had any coronary incident and have been asymptomatic a coronary artery base had a stent implanted. Long story how I arrived at that.

I'm 73, have been cycling seriously, for me, for three years. Averaged 40-60 mi per week, had a few 100 mi weeks, longest single ride 42 mi, etc.

Anyway, according to the rule of thumb, my max heart rate is 149 (220-age). My resting heart rate is 47-49. My question, does my fairy low resting heart rate alter any of the other heart rate zones such as, per FitBit which is very accurate, fad burn, cardio, peak, etc?