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.
Another example:
5min power on mtb in a vo2max interval = 420watts
5min power on roadbike = around 70watts less
But why?
Information: I train basically all my intervals on the mtb. Could this be a reason?
I’ll be interested to read what the coaches write as physiology is so interesting.
Back of the napkin math and n=1 experience speaking, I know from the extremes of position between mountain and my TT bike the muscle recruitment is different enough to notice power/HR relationships like you experienced. What exactly is happening physiologically I can not say. I would think either: 1) pathways are not developed in muscle groups used more in a road position and therefore the heart needs to pump more frequently to supply O2; 2) more muscle is being recruited; 3) combination of 1 &2.
Also, lower cadence usually=lower HR for the same power, same position/bike. I’m reversed from you. I experience best power on the TT bike, then road, then mountain. Road being the predominant discipline.
hi there @jannik.wuester - do you happen to have two different powermeters on your bikes? As in two different brands?
Because I see this alot - its not you - its your powermeters reading different, thus causing the confusion. As in your road bike powermeter is reading lower…
Maybe the key point for my ability to put out more power with lower heart rate on my mtb is, that I basically train all my intervals on the mtb. What do you think? Should I change that, to train my muscles that are used on the roadbike?