Energy Metabolism

Summary and Objectives of Energy Metabolism

The formation and breakdown of ATP, the energy currency of the cell, is essential for any type of body movement including exercise. Macronutrients (carbohydrate, fat and protein) are sources of energy that can be converted and stored as ATP in the cells. To understand how energy is provided for various types of exercise and movement, knowledge of how energy is stored and utilized by the cells is needed.

By the end of the self-study module, you will be able to:

1) Describe how ATP is hydrolyzed and resynthesized anaerobically within the muscle cell
2) Describe the anaerobic and aerobic breakdown of carbohydrate to form ATP
3) Describe the components of the electron transport chain
4) Describe the process of lipid oxidation
5) Compare the ATP output from carbohydrate, lipid and protein breakdown
6) Describe how the macronutrients are used to provide energy during exercise

At the end of the module, you can do a quiz to test your knowledge of energy metabolism (not for grades!) to assess which areas you know and which you need to review.


• McArdle, Katch & Katch. Chapter 6: Energy Transfer in the Body. Exercise Physiology: Energy, Nutrition & Human Performance. 6th Ed. Lippincott, Williams & Wilkins, Philadelphia