Thanks for the reply, Scott. I have done an AnT test. One very recently and a number over the years. HR of ~185 has been pretty consistent. Most of my training over the years has been based off %LTHR or FTP. I’m finding that much of that long duration, low intensity was likely too high which is consistent with various illness and drops in performance during those periods. If only my coach at the time or myself had been more aware of the idea of AeT!
Being more of a hiker/skier/cyclist I am guessing my feelings during the treadmill test were more a result of ME and economy. When skinning for 45-60mins uphill, I will find myself comfortably breathing in the lower 150s. I’ve also noticed during easy runs that an HR of 140 feels more difficult or equally difficult to 150s when on a bike or skis.
Have you found that an overall lack of hunger when doing fasted workouts in Z1/2 is a decent sign that an athlete isn’t over reaching their AeT?