Energy Use Breathing and Heart Rate

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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; therefore we breathe in oxygen twice as fast.

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Method

  • Firstly set out the apparatus with a bench on the floor and a safety mat beside it for safety.

  • Now measure your resting heart rate for one minute. Using a stopwatch to time a minute and a counter to click every time you feel your pulse to keep it a fair test. Also measure your resting breathing rate for one minute; also using a stopwatch and a counter for fairness.
  • Next take off your shoes to keep it a fair test and do 10 step-ups and make sure a partner is stood next to you with ...

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