I have a question about heart rate relating to training fasted in the morning.
I am currently in my recovery week after 3 weeks of build. My training plan this week was Tuesday and Wednesday Pettit (https://www.trainerroad.com/app/cycling/workouts/21542-pettit) and Thursday(today) Whorl (https://www.trainerroad.com/app/cycling/workouts/21534-whorl). These workouts are very similar. Pretty much all in zone 2.
I usually workout in the evening after work. This morning I did Whorl first thing after getting up and my heart rate is through the roof.
Here are the 3 workouts data for comparison:
These workouts have roughly the same Intensity Factor (0.64) and are all in zone 2 so I would expect avg HR to be roughly the same for all of them. My max heart rate is 199.
As you can see for the first 2 (done in the evening with some carb intake during the day) my avg HR was around 131. For the ride I did this morning it was 151.
I had noticed this before when I have been training in the morning but a 20 bpm difference seems rather substantial.
Have any of you experienced this? Is this to be expected?