Two Pathways:
The ATP-PC system
Aerobic Energy System
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Food Fuels
Carbs, fats and proteins are the only food fuels that produce energy Phosphocreatine (PC) is a chemical fuel source Carbohydrates are our preferred exercise fuel either as blood glucose or muscle glycogen (2/3rd) & liver glycogen (1/3rd). <Power Decreases> Fats in the body protect body organs, maintain body temperature, add as protection, hormone production and energy storage and supply. Triglycerides are broken down to free fatty acids, which are broken down aerobically to provide energy. Fats are used at rest, require more oxygen to produce energy, and produces more ATP than carbs, produce energy slowly. <Power Decreases> Proteins are mainly consumed for growth and repair of body cells and tissues. All enzymes are made up of proteins Proteins are used as last resort fuels, have a very high oxygen cost and produce energy slowest of all food fuels Not only one energy system is used in most physical activities - there is generally an interplay between the three energy pathways |