My wife did a a ramp test and her ftp was something like 58. The power never really changed for her during the ramp. I did a test ride and the power did change for me on a workout. I manually set her ftp to 100 and then I saw real changes on the trainer and she noticed the intensity changing too.
So, is there a bottom that would make te not really change intensity and just be a flat line. I have the feeling that if this is true is somewhere in the 60w range