Bioenergics can be defined as "the flow of energy in a biological system, and it concerns primarily the conversion of macronutrients into biologically usable forms of energy." In other words, it is how our body utilizes energy. There are 3 main energy systems available: the phosphagen system, glycolysis, and the oxidative system. Based on the needs of a specific activity (aerobic, anaerobic, or mixed), our body selects which energy systems are required for the activity. The contribution of each system is dependent on the intensity and duration of the activity at hand. With specific exercise, each system can become more efficient and effective for a specific activity. It is for this reason, that physical therapists must understand these systems in relationship to intervention selection, dietary requirements, amount of rest, specific injury, and more to best return your client to their prior level of function (or even higher!). Part 1 is going to provide you with the background information on the physiology of each of these systems.
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