TSS estimated on calender incorrect


#1

I think there is an issue with the TSS estimation calculator when inputting a manual entry in the calender. As you increase the time, the TSS per hour reduces for the same effort ie. 1 hour easy is 36 TSS therefore, you would think 2 hours would be 72 TSS and 10 hours would be 360 TSS but it is not. It shows as 67 for 2 hours and 260 for 10 hours. This shows the calculations are wrong and are only exacerbated the longer the exercise period. A case in point, once you get to 36 hours plus it estimates TSS as a minus figure.


#2

Wanted to add one more thing to comment above.
TR ‘gives’ the estimate of 100 TSS for All-out effort (scale 10) for 1h bike activity
TR%20intensity


#3

Hi there TR :slight_smile:

Is there any particular reason of this non-linear relationship between TSS value and the duration?

Thank you!
Ernest


#4

That’s simply part of the formula. I’ll try my best to explain this one, but it’s a little tricky so bear with me!

A 3-hour ride at “race pace” cannot be completed as fast as a 1-hour “race pace” ride. The non-linear relationship between TSS and Duration is a function of how the longer you go, the “harder” it is at a slower pace.

For example, 1 hour at race pace (RPE 9) is 90 TSS, but 3 hours at RPE 2 is still 98 TSS. It might not be as extreme of a ride, but it’s just as hard. To put it in other words, your TSS/hour is lower but it feels hard because you rode for three hours.

The negative TSS issue on rides past 36 hours is a bug, we’ll get that fixed soon (hopefully before anyone needs to estimate TSS on a ride that long :wink: ).


#5

Larry, thank you for your answer. I get that one about the feeling ’ harder’ as the times goes by, because of the fatigue, but what about the short activities like 5min Level 10. I see an 8TSS/5min (rate of 96TSS/h)?

Thanks,
Ernest