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How exercise affects your heart rate?

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Introduction As a part of my coursework, I have been asked to monitor the heart rate of a person before and after a certain length of exercise. And see how much of a difference it makes on their heart rate. I have found the heart rate of a human adult varies from 150 beats per minute. Whereas in young children the heart rate averages about 60 B.P.M. Prediction From what scientific knowledge I know I am predicting that the rate of respiration in the body will increase as a result of exercise. I also think that there will be a gradual increase in the heart rate to begin with, but then will increase quite dramatically as the body if forced to work harder. After the exercise has been completed what I predict will happen is that the heart rate will decline steadily to the resting pulse rate. Form what I have already learnt in class, what I think what will happen is that the level of oxygen in the blood and the muscles will reduce causing the heart rate to go up. ...read more.


* When the exercise is complete, the current heart rate will be recorded every minute until it returns to its normal heart rate. Results Table Time (min) Heart Rate (per minute) 1 2 3 Average 0 64 64 64 64 1 68 68 70 69 2 100 94 92 95 3 116 120 122 119 4 140 142 140 141 5 140 148 146 145 6 116 120 122 119 7 76 102 84 87 8 68 84 66 73 9 64 74 64 67 10 64 64 64 64 Analysis From what the graphs below shows that the heart rate didn't increase a large amount for the first minute but then it increased very steeply and rapidly for most of the rest of the exercises. Whereas, in the final minutes the heart rate did not increase much at all. I think this is due to the lack Oxygen in the muscles, also a lot of energy was used up during the exercise, this was because the body was not able to continue with aerobic respiration and anaerobic respiration took its place instead. ...read more.


For example, I cannot be sure that the step-up exercise that my brother has done was done at the same rate throughout that experiment. Likewise, I am not really sure that a 30-second interval was kept to the same this timing. If I were going doing this experiment again, I would probably have to look more closely at the method of exercise I used. I think that if I used a piece of equipment like a running machine that it would produce more accurate results because then I would be able to guarantee that the exercise would have remained constant throughout the whole experiment. Finally, if I had been able to use an actual 'pulse-meter' which might have helped the experiment to be more accurate. This equipment would have simply been strapped round the chest of the person involved in the exercise and would have measured your current heart rate. I think this because it would have produced a more accurate heart rate reading and it would not have been necessity to have to take a 30-second break during the exercise. ...read more.

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