I’ll try to display my concerns using an example:
Yesterday I did one of those FTP training sessions one can find in the FTP Building Block. 5 x 8 min was it, to be precise. Well, during the workout I was given the following instruction:
“Your heart should be in zone 4. If it goes up, adjust accordingly.”
What I understand from that is that I must play with my cadence in order to keep at the target power (let’s let aside how this can affect the characteristics of the workout and the consequences low cadence has on the legs over time in terms of fatigue). This instruction leads me to think that the purpose of the session is to spend as much time as possible in Zone 4. OK then.
So how could I possibly discard my heart rate readings as some users suggest? Or, on the other hand, should I focus on hitting power and cadence targets no matter where my heart rate gets to? Is there a % cadence range around which we can move when needed?