I look at the TrainingPeaks TSS as well as the Training Effects score on the Garmin Connect after long rides.
A comparison shows that they are not coherent. Here is one frequent example: I did an endurance ride a couple of days ago, 3 hours plus, close to 4, with a TSS of 188. Garmin’s Training Effect score is 198. I don’t expect them to be the same, that’s fine, different measurement metrics.
Today I did an endurance session on my trainer for a little less than 90 minutes. HR average was 3 higher than the longer ride. TSS shows 92. Which is about half of the longer ride of two days ago of TSS’ 188: 49%
For today’s ride, Garmin’s Training Effect score is 120. Substantially higher than the 92 TSS, but the importance of that to me that it is at 64% versus TSS’ 49% of the longer ride. This happens often.
It is quite a bit of a discrepancy. Which should I rely on as a more accurate indicator of effort? I understand that TSS has been knocked a bit when it comes to measuring endurance level efforts.