The heart is a hybrid engine - just like all other muscles of the body. Here, J. Carter Ralphe tells it like it is! Fatty Acids and Glucose are the primary fuel substrates. Fatty Acids are the primary fuel substrate (percentage wise) at rest and during low to moderate exercise in 'fit' or 'trained' humans.

Loading more stuff…

Hmm…it looks like things are taking a while to load. Try again?

Loading videos…