Tss is a nice way of monitoring power over time. That’s it. It often correlates with long term stress, but not from ride to ride. I disagree that the “stress” term is accurate though. I don’t think it would be hard to argue that RPE on a 20 minute sweet spot pull in the first 30 minutes of your ride would be less than the same pull 3 hours into your ride. On the 2nd example, your RPE, hr and respirations are probably higher, or more stressful, than the first. But based on tss, that was the exact same effort
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