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How exercise affects heart rate

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Introduction

How exercise affects heart rate Aim: My aim is to find out how exercise affects heart rate. Research: The heart is made almost entirely of muscle. It is a hollow organ which pumps blood around the body. The heart is enclose in a sack of tissue called the pericardium. The heart is thought to have evolved from a muscular region of an artery. It is divided up into four chambers: Two atria or auricles situated in the upper part of the heart, whose function is to receive blood. Two ventricles, situated in the lower part of the heart whose function is to pump blood. The right side of the heart receives deoxygenated blood through the Venae Cavae. The blood is then pumped to the lungs were it picks up a new oxygen supply. The left side of the heart receives oxygenated blood from the lungs and is pumped out around the body. The left and right sides of the heart do not communicate. The average human heart beats around 70 times a minute. With each beat 5 ounces of blood is pumped, or approximately 4,000 gallons a day. The heart rests in between beats so it rests more then it works, ie. in a 70 year lifetime the average human heart works for about 30 years and rests for about 40 years. When we exercise our heart rate increases. ...read more.

Middle

I believe that if I had chosen a more strenuous exercise I could not only have supported my prediction but taken my investigation further. I will, in my actual experiment, use a more strenuous exercise such as step-ups. I also think my experiment could have been improved if I had looked at more peoples heart rates and then compared them, I will also do this in my actual experiment. There were no anomalous results, and I think taking an average of my resting rate helped this. Actual experiment Method: I will look at three different people's heart rate's. I will do this by taking an average of their resting rates, this will be measured in beats per minute or BPM. Each person will then do 2 minuets of step-up's and will take their heart rate straight after exercise. They will all exercise at the same time, going at the same rate, to make it a fair test. Their heart rates will then be taken 2 minutes, 3 1/2 minuets and 5 1/2 minuets after exercise. If their heart rates have not returned to normal by this time their heart rates will be taken at intervals until it has reached resting rate. I will also record their heart rates 10 minuets after exercise to make sure the original resting rates were correct. They will all be taking their heart rates at the same time to make the test fair. I will record my results in a table and then graph them. ...read more.

Conclusion

This could have been because of human error when counting their pulse rate or a natural occurrence that happens after exercise. I believe my results are good enough to draw these conclusions as the experiment was carried out fairly and there are no anomalous results. Evaluation: I think that my experiment went well. I do not believe that anything I did was done unnecessary or done badly. I would have liked to have repeated my experiment more times as this would have made my results more accurate. There were no anomalous results which suggest that my results were accurate. I could have improved my experiment by researching further into each of person A, B and C's lifestyle's. I could have then looked at the question 'How does lifestyle affect heart rate?' Instead of 'How does exercise affect heart rate?' This would have taken my investigating further. If I were to do this I could also use a fitness chart to compare fitness levels given from this and fitness levels drawn from my experiment. I could also have used more people to see if the patterns I have found from this experiment were correct.. If I had extended the time of exercise, the patterns I found would have been likely to be more pronounced. To make the whole experiment fairer I could have used a heart rate monitor to have more accurate results. This also would have cut out the human error and I could see if peoples heart rates do go lower then their resting rates, before returning to normal, after exercise. ...read more.

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