After a long winter on the turbo and making some FTP gains, I have started to ride outside with the warmer weather. After a week off for a skiing holiday and 2 weeks of illness, I started easy with a couple of endurance rides with the focus on riding power Z2. with an FTP of 280W just before the break, my endurance zone is 150-210ish which i expect to have a heart rate of 125-140bpm. I knew I would have lost some fitness, but to maintain a lower heart rate, I had to ride 50/50 between power Z1 and Z2. I ended with a NP of 146W, which I expected to be more like 170-180W.
So, should I continue to do these easy aerobic rides according to power or keep a focus on trying to keep my HR down to? I know I have lost some fitness, and will need to retest soon, but I can’t have gone backwards that much in such a short period of time.