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INVESTIGATING THE SHORT-TERM EFFECTS OF EXERCISE ON THE BODY Sahir Kara 10Hill Experiment Aim: To investigate the short-term effects of exercise on the body, by measuring and comparing the recovery rates after different intensities of exercise on the same person. Background Knowledge: When you begin your exercise your body responds to the orders of your brain to move your muscles in a more vigorous way. As soon as these movements begin, a number of rapid automatic changes also occur throughout your body. Firstly, the muscles immediately start to burn more energy to fuel their contractions. They do this by converting stored ATP chemicals (adenosine triphosphate) to the usable ADP energy (adenosine diphosphate) inside each individual muscle cell. (RESOURCE 1) During sustained, aerobic activity, like a brisk walk or steady running, your working muscles might use 15 to 25 times more energy than they do at rest, using much more oxygen that is inhaled. During an intense short...

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