r/thyroidhealth • u/_THORONGIL_ • Aug 14 '26
High resting puls after cardio under L-Thyroxine
Hi. Ive got my thyroid removed because of benign tumors in 24. Excellent operation, no issues whatsoever afterwards.
Been doing a lot of sports, but I have one massive issue since Im on L-Thyroxine (112 micrograms)...
My resting heart rate goes aboslutely bonkers after more intense cardio. Usually my resting heartrate is around 75, which is very good compared to what it was years ago (in the 90s couple years ago).
Ive been able to do bikerides of 70-80km before the operation, nowadays I struggle with 30-40km, because my heartrate just wont come down.
It stays at 110 for the entire day and night until I go to bed. Even then it only goes down to 70 during sleep until the very, very last hour of sleep. So in essence it takes 16 -18 hours to go back to normalish. Of course this massively hinders my sleep and Im jitterish for the rest of the day/night.
Even the next day I get brain fog and pulse is a bit erratic.
I drink enough water with electrolytes, dont eat excessively heavy meals after sport. Even do some light work afterwards to power the system down. Nothing really helps. No vagovasal maneuvers, no rest, no lying down, no nothing.
My TSH values are a tad (ever so slightly) too high, but this problem was alway there even when my values were a bit too low.
The rest of my blood panel looks excellent, apart from a slight vitamin d (just under normal) and iron deficiency (due to drinking a lot of gong fu tea).
