OK, so I understand there will always be a difference between indoor and outdoor, but 10 beats per minute?
I tend to feel that workouts are easier outdoors, and now I have some good data to back it up. 13 days ago I did 4 x 8 minutes @ 100 % FTP (Mount Regan) outdoors, and it felt only moderately hard. Over the final four minutes of the last interval, I averaged 273 W and 167 bpm. Today I did the same workout indoors and got 271 W and 177 bpm. It felt much harder.
Outside I use an Assioma Uno power pedal, while inside I rely on the Tacx Neo 2T. When I compared these 9 days ago (ZwiftPower -Â Login), I found that they are within 2% of each other at about FTP.
I realize there are many variables, e.g. the outside ride was in week 1 of my autumn program, while today is in week 3. But I feel well and rested, and like I said, this is not the first time I feel that outside workouts are easier. Also, the temperature outside was only 11 C. But I have a decent fan indoors, and I didn’t feel overheated today.
I’m wondering if the power pedal is to blame. It’s supposed to have accurate temperature compensation between -10 and 60 C, but what about sudden changes, i.e. if I take the bike out of the house to ride?
I don’t always calibrate the pedal before each ride, but when I do, it almost always comes back with the number 0, which makes me think it doesn’t really vary from day to day.
Anything else to consider? Is 10 bpm normal, or is there something wrong here?
I can’t help but feel that now it will make a substantial difference whether I do a workout indoor or outdoor. And the adaptive training is going to be a bit pointless if the perceived effort is just going to depend on where I did the workout.