I think something must have got lost in your understanding of the article, if indeed it was written by someone sensible.
As several contributors have pointed out, the heart is a muscular organ that needs an energy supply. This is because the heart does
mechanical work, by pumping the blood through the body against the resistance to flow that the blood vessels impose. Work is a form of energy, so something that does work needs to get energy from somewhere, to turn it into work. In the case of the heart, the energy comes from the blood, as it does for all other organs of the body. The blood supplies the fuel (glucose etc) and the oxygen to enable the cellular respiration reactions to occur:
http://en.wikipedia.org/wiki/Cellular_respiration
This is clearly an
open process, since the oxygen in the blood comes from the lungs, while the fuel in the blood comes from the digestive system. When part of the heart muscle is deprived of its blood supply, it stops working - and a heart attack ensues.
So this thing about the heart being "made up of energy that doesn't change" can't be right.