I have a concern:
My power output at around 220watts gives me on the mtb a heartrate of 130. Thats normal endurance pace.
But when I do the same amount of power on my roadbike, I have a heartrate of 140-160 beats.
This ramps up, the higher my power outbut becomes. I can definitly not put out the same power on my roadbike.
5min power on mtb in a vo2max interval = 420watts
5min power on roadbike = around 70watts less
Information: I train basically all my intervals on the mtb. Could this be a reason?