I'm trying to understand watt related to heart rates and have two questions, please only answer if you are sure of what you are writing is true, so no guesses ;-)
After having ridden 1 hour my power is n Watt and my heart rate is x bpm, now a hour later my power output is still n Watt, is my heart rate still x bpm? (assuming same course conditions)
I ride a course with an average of n Watt. Later being more fit, I ride the course again with an average of n Watt, my average heart rate is lower on the second ride, right?