just started mid-volume build. using ERG mode Kickr 50/17 combination for gear.
While I finished the intervals (very tough: as they should be) I noticed that while my HR was appropriately high, the muscular strain seemed more of my perceived limitation for pain rpe. In other words, the interval was relatively tougher on my muscular system versus my cardiovascular system. I generally try to hold 100-103 for these. In fact, that’s the RPM I instinctively hold. Once fatigue sets in, my RPM can drop to 95 and it becomes too hard- then I spin faster to get to 98-100.
Any insight on this? Is this normal? Do I need to work more on strengthening my legs via weights?