I had this same experience the last 3 weekends, my perceived exertion was zone 1-2 but my garmin-recorded HR was bottom of zone1 or below. HR was about 15 bpm off where I would expect based on feel. It was greatest (HR difference) this past weekend; I would think as I become more acclimated, HR would start to creep back up toward normal level. So in TP it looks like I was slacking, but I think you’re saying that even with the lower avg. HR, I’m still getting the right training effect.
I live at sea level and was hiking at 7-9.5k.
Does having a depressed HR while hiking at elevation having any correlation to experiencing AMS?
Jennifer