I have noticed over the past several weeks, my Fitbit Charge 4 reporting longer times in my peak heart rate zone, than it used to, for the same types/calibers of workouts. I can’t find any reason for this change. Also, my RPE does not match with a peak heart rate for the amount of time it’s reporting. Maybe some of the minutes were peak, maybe none felt like peak. I don’t understand what changed. Ideas please? I am 45, very fit, and would say my max heart rate is 175, but my watch is claiming 155 and up is peak.
