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I've briefly athletics described all three energy pathways of the body athletics so that you will know what's going on. There are three energy pathways of the body, phosphocreatine shuttle, glycolysis, and oxidative metabolism. Phosphocreatine (PCr) yields low amounts of energy at a very high rate and is used in very high intense exercises such as sprinting. Glycolysis breaks down glucose for more energy than the PCr system, but athletics at a little slower rate. It is used as the next energy source when the PCr system runs out. Lactic acid production is a key characteristic of this pathway. That's right, when you're lifting weights, lactic acid is the burn you feel towards the end of a set. That is how you know that you are using glycolysis as the major pathway for fuel. Finally, oxidative metabolism can use fats, glucose, or proteins for energy. This pathway is the final energy pathway; it yields the highest amount of energy, but at the slowest rate.
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