Originally Posted by
DaveLeeNC
Per Training Peaks
Lactate Threshold (LT) is also referred to simply as threshold. Lactate Threshold Power is also referred to as functional threshold power (FTP). For most trained athletes this is similar to the maximum effort they can maintain for an hour.
So ftp is actually a lab measured metabolic thing and the 'one hour max steady effort' measure is an approximation. So some folks probably can do 105% of their actual ftp for an hour.
dave
The original point of FTP was that it was a relatively simple measurement to make in the field. It was never a lab based metabolic measurement. I don't think there has ever been a definition of FTP that would support riding at 105% for an hour. People that ride over 100% for an hour simply have their FTP set too low which is not uncommon as FTP is not constant over time.