2 doctors weighed in:

What is it that increases or decreases heart rate?

2 doctors weighed in
Dr. Michelle Zetoony
Internal Medicine - Sleep Medicine
1 doctor agrees

In brief: Lots of things

The major contributor to whether or not your heart rate will be up or down relates to sympathetic and parasympathetic hormones (adrenaline and noradrenaline, etc).
Add on top of that many medications or drugs that can affect this including caffeine, betablockers, alcohol, etc) and you can see dramatic effects on heart rate.

In brief: Lots of things

The major contributor to whether or not your heart rate will be up or down relates to sympathetic and parasympathetic hormones (adrenaline and noradrenaline, etc).
Add on top of that many medications or drugs that can affect this including caffeine, betablockers, alcohol, etc) and you can see dramatic effects on heart rate.
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