Stimulants Dexamphetamine dosage and heart rate

[burn out]

I am just wondering about how much heart rate increase there is on dexamphetamine. The reason I ask is because I generally do not like being on any drug that significantly increases my heart rate, I find it uncomfortable and anxiety provoking. However tonight I have taken 20 mg dextroamphetamine and snorted 10 mg and so far I don't notice any increase in heart rate. The effects at this dosage are pleasant but mild. What dose would be good for a strong high and how much increase in heart rate would there be? Thanks.