RPE scale vs Fosters CP-10 RPE Scale

1

Just a quick question about the RPE-scale in intervals.icu. The descriptions for the individual numbers does not match up with the original scale from Foster (which Garmin utilizes).

Intervals.icu
1 - Nothing at all
2 - Very easy
3 - Easy
4 - Comfortable
5 - Slightly challenging
6 - Difficult
7 - Hard
8 - Very hard
9 - Extremely hard
10 - Max effort

Fosters:

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Where are the labels from intervals.icu from?

2

I hade a look back in the code (feature added 31st August 2021), Googled etc. and I cannot find out where I got those. They probably came from a coach blog or similar. They aren’t too much different from the original Foster version.