Thanks for the reply Scott!
I believe my AnT is around 178-182. In 1-2 hour long trail races I would average around 180 to 182, reaching 188 on hard climbs, but that was back in 2016. I’ve yet to do a full hour-long AnT test as there aren’t any hills open right now in Vancouver that would take that long. However, in some shorter efforts, I’ve been up in that range for 20-30 min and it felt fairly sustainable. I’ve just assumed my AnT would have dropped a few BPM over the 4 years and used 178 as a conservative value.
Regarding decoupling at AnT. If doing a 1hr climb at AnT heart rate, would you not expect to decouple a bit over the hour despite the same AnT Hr? Or do you mean the rate of decoupling doesn’t increase, so still a slowing pace, but it’s at a fixed %.