Originally Posted by
kukusz
Is the 20-30 Watts loss primarily due to the heat and motion of the trainer?
I will be doing this to set my training levels, so it sounds like doing it outside is the best bet. I was having a hard timing finding an 8 mile stretch on which to do my 20 minute FTP test, but I'll manage something.
Almost all due to the rider overheating.
Even with my garage door most of the way open when the temperature was about 35F, I was only able to manage 310w for 12minutes a while back.
Riding outside, I can do that for most of an hour, and 325-330 for 20min.
That, and the complete lack of anything to distract you sucks too. I watch DVDs on my laptop and I still can't take my mind off of the pain.