How much of a change in the heart rate of the frog did you see after the addition of calcium chloride?

A lot of 'racing heartrate' drugs are Calcium Blockers, designed to block calcium. So i guessing calcium must cause a racing heart or palpitations in some people. I myself am on them. If having to take calcium, see if you can also take a combo of potassium and magnesium phosphate. Apparently the heart is a potassium muscle.