What’s this thing, “Functional” Threshold Power

blown

I’ve been thinking about FTP more and more as I gear up for a century next weekend. I’m not saying anyone is wrong, just some food for thought

I teach indoor cycling at a big box gym. I have several certifications, most notably training with watts. I am not an aerobics instructor. I don’t teach at SoulCycle or any of that ilk. I teach using sound cycling principles, not push-ups on the handlebars.
 
The past two weeks I’ve taken my classes through 20-minute functional threshold tests. I’ve done this myself using Trainer Road and Sufferfest and both apps have increased my FTP based on my virtual watts. I’ve also watched many in my virtual communities go as hard as they can for 20 minutes and the apps call it their FTP.  In my education, this is incorrect.
 
FTP means ‘functional’ threshold power, an estimation of what you can function at for 60 minutes, not 20. It’s not balls to the wall, hard as you can, throw up at the end effort. One of my group called it her ‘forever pace.’ The rate of perceived exertion is 6-7 out of 10 – you’re breathing hard; you can recite a line of Mary Had a Little Lamb but need to take a breath. Train at too high an effort consistently and you will feel the effects of overtraining.
 
I have this problem myself – I get all jacked up about the numbers and go hard, hard, hard, but only end up feeling like complete carp halfway through the season. I was training at too high an effort when I should be at my ‘forever’ pace.
 
My FTP on both Trainer Road and Sufferfest is 220w. My indoor FTP on the Keisers at the gym is 240w. Which is right?
 
It doesn’t matter. 220w on my bike on the trainer feels the same as 240w at the gym: sustainable (rpe 7) for one hour. What matters is that I have a concrete number to work with, just like that evil number on the scale.
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