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energy can be defined as the capacity or ability to perform. energy comes from the breakdown ATP

• adenosine triphosphate • ATP is a chemical that serves as the immediate source of energy • it is made up of 1 adenosine and 3 phosphates which are linked by high energy bonds.

when there’s high energy bonds and one is released it powers muscular contractions

CP, PC, - creatine phosphate is a molecule similar to ATP that its a chemical that splits releasing energy. • ADP + P = ATP

complex (low GI) - bread, grains, pasta simple (high GI) - white bread, lollies, fizzy, chocolate when CHO is digested they are converted to glucose and stored as glycogen carbs are the main fuel source for energy

• fats are obtained from dairy products, nuts, meats and oils • fats are broken down to fatty acids, which circulate in the blood and triglycerides which are found in the muscles

protein contains amino acids which are vital for growth and repair • it come from meats, fish, eggs and dairy • amino acids can be used aas energy in extreme circumstances such as starvation or prolonged activity.

during prolonged physical activity such as a marathon the body will use up all its carbohydrates resulting in it using the fats and that will require more oxygen making the body work harder this puts strain on the body and is known as hitting the wall

glycogen sparing is the process in whereby glycogen stores are not used early in exercise

at rest the body doesn’t need much energy so the ATP production is low, whereas when the body the body is exercising its in demand for more energy requiring a higher rate of ATP