Why don't my CTL and ATL in WKO4 match my CTL and ATL in TrainingPeaks?

CTL and ATL are components of rolling TSS/day (2x your set constant), so any differences in CTL are likely happening in TSS. If you're seeing different CTL and ATL numbers between WKO4 and TrainingPeaks, here are a few things you can check to find out why.

  • Check the athlete's set FTP. You'll need to manually record the FTP history for each athlete and ensure it generally matches the settings in TrainingPeaks. This can be reviewed/completed on the Athlete Details tab; click the down arrow by FTP and select your desired time range in the RHE (right-hand explorer); we suggest reviewing the past 30-90 days. 

  • If the FTP matches, the next step is to check workout TSS in WKO4 against TrainingPeaks. For any particular date, the TSS numbers of the prior 90 days affect the calculation, with the most recent 30 days carrying the most weight. The TSS & IF Chart makes it simple to review TSS in WKO4 and TrainingPeaks, or you can simply create a report in WKO4 with one expression: tss. If TSS doesn't match on a particular workout, this is often because sFTP doesn't match, so give the sFTP history a quick check again.

  • If your workouts' TSS match TrainingPeaks, compare the daily IF numbers in WKO4 against TrainingPeaks. Again, the TSS & IF Chart is a simple way to do this. If the daily IF numbers are not the same in WKO4 and TrainingPeaks, check your sFTP history once more, as this is usually the culprit when IF doesn't match TrainingPeaks. If your IF values are different but your sFTP history is the same, review the normalized power numbers for your recent workouts to see if those numbers match between WKO4 and TrainingPeaks. There should be a slight difference, as WKO4 calculates Normalized Power in a slightly cleaner way (it handles pauses more accurately), but the difference shouldn't be more than 2%. If you find a time range where these are more than slightly different, check the sFTP history again for that time period.
  • Check the sport type that's selected. This doesn't affect the Hero Bar (the numbers at the top of the WKO4 screen), but it will affect some charts, so make sure you have all sport types selected in the top right selection tool, as these may cause charts to report CTL and ATL reflecting only files of the selected sport types (though many charts are built to include only the specific sport they're reporting, regardless of what sport type is selected).

  • Check to make sure the athlete's CTL and ATL constants match between WKO4 and the charts in TrainingPeaks.com. To see the constants in WKO4, simply click on the numbers in the Hero Bar (as shown below).


  • Check the number of workouts to make sure all of your workouts have synced successfully to both WKO4 and TrainingPeaks.
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