HR Runner, Pace Runner & HR Cycler

Hey,
I think your rTSS calculation is wrong. But the calculation from this site: https://www.trainingpeaks.com/blog/r...tss-explained/
is also not the same that trainingpeaks uses on its site.

I think you are using exactly the formula from the site.
But when you plan a training in trainingpeaks and you plan one hour with your threshold pace, the formula would calculate 100TSS. If you plan a swim or bike training with one hour and IF 1.0 it results correctly in 100TSS.
But trainingpeaks results in 111rTSS.
The only way to reproduce the values that trainingpeaks calculates, is to divide the FTP in the formula by 1.11.
Example:
FTP = 15km/h
NGP = 15km/h
IF = 1.0
s = 3600 (1hr)

(s * NGP * IF) / (3600 * (FTP/1.11)) * 100 = rTSS (real rTSS in trainingpeaks)

(3600 * 15 * 1.0) / (3600 * (15 / 1.11)) * 100 = 111
(3600 * 12 * 0.8) / (3600 * (15 / 1.11)) * 100 = ~71

These are exactly example values from my trainingpeaks.

I think the given formula from trainingpeaks is wrong at all. At least in front of the trainingpeaks calculation.
I already opened a ticket in trainingpeaks.
I don't understand why only the rTSS calculation is different to all other (sTSS, TSS). I always read on trainingpeaks, one hour on IF 1.0 (Threshold pace, power, heartrate whatever) should result in 100TSS. But only rTSS results in 111.

Do you know something about these calculations?

edit: and how do you calculate NGP? I couldn't find a formula anywhere.