I have huge differences in my heart rate based on external conditions, but I’ve seen an even larger gap this year as my fitness and volume has increased considerably. My heart rate is so much lower across the board in cool and non-humid conditions that you would almost think I’m 2 different people. I’ve seen a similar trend in running too, but it’s no where near as pronounced as in cycling.
As an example, below are my heart rates in different zones from doing outdoor workouts in hot/humid summer conditions.:
Recently have done a couple workouts with temps in the 50s and low humidity- here’s about the HR splits that I saw. I almost give Lionel Sanders a run for the money with low HR:
Max: 155 (I rarely crack 150)
I’ve also seen a similar split indoors as well performing workouts with no fan/cooling vs with the AC lowered and a big fan pointed right at me!
I know that it’s fairly common to have swings in heart rate based on external conditions, but I’m curious as to how others’ threshold and max heart rates vary based on temperature.