Hi - I have a set of workouts built based on % FTP and the workout shows the ‘expected’ stress score (TSS)… but when I change my FTP the workout stress score does not change like I would expect it to.
If a workout has some intervals at 100% FTP and that equals 250w and then I increase my FTP so 100% is now 260w the stress score of that workout should also increase but I can not seem to make that happen - bug, user error or miss-understanding?
Misunderstanding 
If % of FTP (intensity) stays the same the stress is the same.
Intensity or IF (is basically % of FTP)
Ah ok so that does make sense as I guess the new higher FTP suggests I can take more stress and therefore therefore the stress of the ‘harder’ ride is actually the same.
Not sure TD is displaying the workout TSS correctly though. This example shows the workout as 74 but executed using ERG mode it was actually 83?
Separately how should I think about entering increased FTPs in TD then as if I performed this ‘harder’ ride the day before I changed my FTP it would have had a higher TSS as TD didn’t know my FTP was higher and therefore calculated the stress as higher - or put another way last week this ride was too easy? In order to increase intensity between FTP tests should I increase my FTP as an assumed increase?
ps here is that exact same workout completed pre FTP increase
2X20, you love punishment I would not worry about these small stress differences of 10 tss on a day… it’s more the mid to longer term trends that are benefit if CTL/ATL/TSB… FTP is not really FTP Meaning it’s just the result of a test and again it’s the trends and the relative intensity that matters. It’s also good as if you believe your FTP is a certain value, then you say “I can finish this 2X20.” But technically yes if your FTP is actually higher and you did the workout I guess you should use the higher FTP for the workout TSS calculation but again, all this stuff is not that accurate. (human physiology vs simple mathematical modeling)
I will review these two workouts on your account though and see about this 83 vs 74…
We do have an FTP history and you should be able to add a value for the day before that workout and re-calculate it and it should be corrected but I don’t know that this has been super well tested.
