[rutgervanderzee]

It seems to me you have been trying to test your AnT using something that resembles a ME workout. To ever get close to your AnT on a course that incredibly steep you would need to do some very specific training or at least use poles efficiently.

Remember that all heartrate based thresholds are sport and terrain specific. It will be different on flat terrain compared to steep terrain, as they are completely different movement patterns. Just as it will be different on a bike or XC skis.

So you need to find the theshold heartrate zones for the training environment(s) that are relevant to your goals. If that´s the VK of Fully than you know what you need to work on 😉