How is Training Stress calculated here?

[Gerald]

It depends if you use Power, HR (HRSS, Ave HR or TIZ) or Pace, and the order of priority set in /settings page.

Power is calculated the same way as TrainingPeaks, with non-moving time ignored. So that is:
TSS = (sec x NP x IF) / (FTP x 3600) x 100

Some previously discussed topics with response from David:

Load // Strava/Intervals

Tx. The Intervals.icu load for that run has been calculated from the HR data using HRSS and the number looks “good” (103 for a 1h17 run is 88% intensity which is reasonable). This is designed to produce numbers similar to what you might get from power data for the same activity (TSS formula). In general a 1hr max effort should get you load of about 100. I don’t know how Strava and Garmin calculate their numbers (165 and 162). They is clearly not on the same scale as TSS. Intervals.icu tries to…

How training load estimation from HR works

Intervals.icu has 2 ways to estimate training load from activities with only heart rate data and no power. You can change between them in /settings: [Screen Shot 2020-01-22 at 05.36.34] The default “Time in HR zones” model uses the moving time in each heart rate zone. Your previous activities with power and heart rate are used to build a linear regression model to estimate training load. If there are not enough activities then a general (not athlete specific) model is used. Essentially each H…

How is calculated Training Load?

I noticed that the training load value is an average between (heart rate tss and Tss of training peaks); how is it calculated? is the relative effort of Strava?