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GCSE Coursework- Energy Use Breathing and Heart Rate Introduction I must plan an experiment to investigate the link between energy use, breathing rate and heart rate. My experiment should enable me to say whether doubling the energy use doubles the breathing or heart rates. Apparatus Bench, Number counter, Stopwatch, Mat. Diagram Prediction & Reason I predict that when you double the energy used initially the heart rate will increase rapidly maybe even double; but then it will increase at a slower rate. This is because as the working muscles need more oxygen and glucose from the blood the heart's stroke volume will increase so the heart rate will not have to increase rapidly. I predict that the breathing rate will double as the energy used doubles. This will happen because as the muscles energy used doubles they will need double the oxygen and need to get rid of double the carbon dioxide to respire;...

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