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  • Level: GCSE
  • Subject: Science
  • Essay length: 2206 words

How does exercise affect your heart rate?

Extracts from this essay...

Introduction

Guillaume Wright 9C2 C/W How does exercise affect your heart rate? 10/6/00 (Page 1) Aim: To find out whether exercise affects the heart rate (beats per minute) of the body. Prediction: I think that the more exercise that is undertaken the higher the heart rate of the body will be. This is because when the body exercises the cells of the body need energy to make the muscles move and work properly. To get the energy the body takes in oxygen from the air and this oxygen is transferred to the blood through capillaries and this blood is pumped around the body to each cell so that the oxygen (and glucose) can be used in respiration to produce energy (and water and carbon dioxide) for the muscles to work and undertake the exercise in question. But as the exercise increases so does the need for energy to the muscles to make them work harder or longer. This means that more oxygen (and glucose) need to be transported to the cells for respiration to occur. This will then mean that the heart rate will increase because the heart has pump more blood containing the vital components of respiration to the different cells thus making the heart beat faster the more exercise is undertaken.

Middle

heart rate (1 min) heart rate (1 min) 2nd Average heart rate 30s 90 86 88 60s 118 122 120 90s 140 139 139.5 120s 154 157 155.5 150s 162 164 163 180s 167 168 167.5 Average - resting heart rate 64 beats per minute Exercise time (sec) heart rate (1 min) heart rate (1 min) 2nd Average heart rate 30s 78.6 75.3 77 60s 108 111.6 109.83 90s 123.3 126 124.6 120s 136 140.3 138.16 150s 142.6 146.3 144.5 180s 146.6 150 148.3 Guillaume Wright 9C2 C/W How does exercise affect your heart rate? 10/6/00 (Page 3) Conclusion: From our experiments that we done we have concluded that as the amount of exercise undertaken by a person increases the faster (higher) their heart rate will be. This is because when a person undertakes any movement or exercise they need oxygen to be taken in by the lungs and transferred to blood cells through the capillaries in the body and for the blood to transport the oxygen (and glucose) to all the body cells by being pumped around by the heart, so that they can use these two things in respiration (a reaction that takes place in every cell in the body)

Conclusion

We could improve the experiment that we have done by doing the above suggestions for improving the reliability and the accuracy of the results. We could improve the accuracy of the measuring of the experiment by doing it in milliseconds and also measuring the heart rate for only 10 seconds after they have done the exercise and multiplying this by 6 so that the heart does not get a chance to go back to it's normal resting rate and there is less room for inaccurate measure. We could also repeat the anomalous result to check whether its just a measuring error or in fact it is what we have mentioned above about the interference of another point. To extend our experiment we could also see if the same rule applies to other types of exercise and suggest why. We could also see what happens when we go to both extremes of the line graph and see what happens when the opposing force finally forces the heart rate to stay the same and if you can ever reach the maximum heart rate and what happens when or if you do. We could finally investigate further the mathematical formula behind the line and see why this is using science so that we could use this in estimating and draw up more complicated conclusions from it.

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