Am I correct in thinking that if the intensity factor for a very long ride is very high it could be a sign that FTP is set too low? If so, what kind of # would lead you to re-test FTP? I noticed umd's ride report about his race being intense and noting that he was at nearly 0.9 IF for a few hours. I did a hard group ride today and ended up with an IF of 0.93 (TSS 329) for just about 4 hours in the saddle (including more than 1 hour above what I think is my threshold and more than 30 minutes at more than 60 watts above threshold). I'm wondering if this might mean I need to redo my FTP test.
Thoughts?