Does heart rate increase when ft4 gets high in range even if ft3 stats low in range?

[lisan1]

Or is it only when you get higher ft3 levels that the heart rate increases?

Anyone who knows?

[Warrior75]

This is a really good question I'm afraid I don't know but I'm really interested to find out the answer x

[Ralph1985]

Are you asking this because your heart rate increased all of the sudden?

[lisan1 in reply to Ralph1985]

No, just wondering how it works.

[startagaingirl]

Hi - it is t3 that drives your metabolism and all bodily functions, not t4, So if ft3 is low in range it is extremely unlikely that your heart rate will increase, presuming we are talking about the slower than normal heart rate caused by hypo.

[TimD250172]

This is exactly what I was thinking myself recently.

My heart rate is around 55bpm at the moment and It isn't really any different than when my T3 was low even though i have ft3 in the upper quarter of the range now.

PS I'm not athletic.