What Are FFAs?
Free Fatty Acids are not bound or attached to other molecules, like triglycerides or phospholipids. The uncombined fatty acids or “free” fatty acids may come from the breakdown of a triglyceride into its components (fatty acids and glycerol). Free fatty acids are an important source of fuel for many tissues since they can yield relatively large quantities of ATP. Typically many cell types can use either glucose or fatty acids for this purpose. However, heart and skeletal muscle prefer fatty acids. On the other hand, brain cannot use fatty acids as a source of fuel, relying instead on glucose, or on ketone bodies produced by the liver from fatty acid metabolism during starvation. This is my suggestion, as HIIT implements the usage of carbohydrates and glucose to fuel the session. Lactate production also increases, which decreases the FFA mobilization rate and increases the re esterfication rate (SP?). This is where glucose/carbs become vital and your body turns directly to glycogen/gluc
