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View submission: ELI5:Why the heart doesn't get cramp ?
I can take a stab at this. From my understanding, the heart's preferred energy source are fatty acids. Two main reasons, provide the most calories per gram as well as allow for continuous oxidative metabolism. That is, the heart will not use anaerobic metabolism to regenerate the high energy intermediates needed to convert food to basic cellular energy, that is ATP. This will decrease lactic acid build up and thus reduce cramping.
There's nothing here!