Originally Posted by Machka

I'm sorry ... HOURS????
When I finish a ride, even a really intense one, my HR is back to normal within minutes.
You might want to seek medical attention.

Originally Posted by Machka

I'm 52 years old.
My fitness level has dropped a lot in the last couple years, but nevertheless, I did my first Zwift race a couple weeks ago.
Over 44 minutes, my average HR was 167bpm and max was 175bpm. I gave it all I had!!

In about 200 metres, my heart rate dropped from 170 to 136, and when I got off the bicycle, it was below 100 bpm several minutes later.

If my HR stayed high for hours, I would certainly be worried!!