How much energy does it take to make a heart beat? And how much energy is given off when the heart beats?

Question

I'd like to know how many calories it takes to make the heart beat, or joules, whatever form of measurements would be appreciated. And if we were able to extract the energy from a heart beat, how much would it produce? Thanks ===

Answer 1

In a discussion as to the power of a heart (reference 1):

"When a person rests, the heart needs only 0.1 watt of power for adequate operation. When a person is excited, however, the power requirement jumps to at least 10 watts. A major problem is that most small-scale energy sources cannot deliver the 10 watts of power demanded by a normal heart."

As to the energy required: the sinoatrial node (SA node) is the "pacemaker" for the heart. Artificial pacemakers consume somewhere between 10 and 40 microwatts (reference 2), although some references put it as high as 60 microwatts. Any way you cut it, it's a tiny amount of electriticy.

Answer 2

kenitc energy might have the answer in it's formula