Hi Mark
Thanks for the advice
I think it worked it out now with that help. Aimed way too low initially. In case your interested in the process:
Had a go yesterday starting at 141bpm, and saw nothing
Then started at 150 today, and saw a negative drift to 141bpm in the first 30 mins.
That just annoyed me so I started progressively ramping up. And put the speed up 20%, HR stabilised at 153bpm, then saw a ~2.6% increase over the next 20 mins (Determined this after with TrainingPeaks).
I kept ramping up, and started to feel a bit of a Z3 effort around 163bpm, and blew up at ~170bpm
So I think I’m finally in the ballpark around 155bpm. I expected it to be lower I guess.
Thanks again