Originally Posted by
guachi
Combining a PM and HRM has shown me that I can put out far more power inside on a trainer than I can outside for a given heart rate
Interesting that this is your experience.
I've heard the opposite from many people that first start on the trainer; in fact, I was listening to the trainer road podcast and they were talking about this.
Their hypothesis was that on the bike, you get a lot more cooling than on the trainer so you could put out more power.