What is the training effect and 'effective intensity' of a workout when you are pretty tired (and probably need a rest day). A typical example would be a day where your data (HR and/or power) says that you rode 2 hours in your endurance zone - typically a pretty easy ride. But your RPE was more like a relatively tough tempo ride session.

From a training effect perspective, does this ride stress your system like a hard tempo ride. And yes it will take an appropriate amount of rest to actually get a benefit from the training effect.

dave