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  • Level: GCSE
  • Subject: Science
  • Document length: 2521 words

How does exercise affect pulse rate?

Extracts from this essay...

Introduction

How does exercise affect pulse rate? Planning: I am doing an investigation to find out how exercising affects peoples pulse rate. Your pulse is the rate at which blood is pumped around the body by the heart. We measure this in bpm (beats per minute) because this is the most practical way to measure it. The variables that can have an effect are how long a person exercises for, whether the exercise is high or low impact and how fit the person is. The input variable is how much/little the person exercises and the output variable is the persons pulse rate. I am going to investigate if exercising for different periods of time affects somebody's pulse rate. I will do this with a group of five people (including me), each person will exercise for periods of 2, 4, 6, 8 and 10 minutes. We chose these times because we felt that exercising over a 10 minute period will show more changes in pulse rate, exercising for less than 10 minutes may not produce as good results as your pulse rate may not vary as much. People may not be able to exercise constantly for more than 10 minutes so we thought that 10 minutes was an adequate time. Also, we chose to take the pulse every two minutes, rather than every minute so that we can see a bigger change.

Middle

We will measure the output variable and control the input variable. So we will control how much exercise the person does (by controlling the amount of time they do it for) and count how many beats per minute their pulse does. To make sure that the method is safe if anyone gets to tired we will make them stop and rest. Here are the results for each person that took part in the experiment: My results: (Resting pulse- 64bpm) Length of time exercising (mins) 1st 2nd 3rd Average 2 103 106 102 103.7 4 121 126 124 123.7 6 131 136 132 133 8 137 139 133 136.3 10 134 136 133 134.3 Jen's results: (Resting pulse- 89bpm) Length of time exercising (mins) 1st 2nd 3rd Average 2 142 145 143 143.3 4 151 154 159 154.7 6 160 161 162 161 8 165 164 162 163.7 10 163 162 164 163 Ruth's results: (Resting pulse- 74bpm) Length of time exercising (mins) 1st 2nd 3rd Average 2 100 118 144 120.7 4 137 136 134 135.7 6 140 142 144 142 8 149 147 150 148.7 10 150 151 148 149.7 Kayleigh's results: (Resting pulse- 76bpm) Length of time exercising (mins) 1st 2nd 3rd Average 2 106 102 103 103.7 4 125 130 129 128 6 135 136 133 134.7 8 134 136 135 135 10 137 138 137 137.3 Claire's results: (Resting pulse- 68bpm)

Conclusion

produced the same kind of curve that everybody else's did, but it was just a bit higher. Therefore, although we may have counted a few beats out we could still come up with the same conclusions from the people tested with or without the heart monitor on. I think that the graph would look different if everybody in the group wore a heart monitor because the lines on the graph would be a lot higher up, but the curves would still be the same. The only problem we came across was it being hard to count (ad sometimes locate) your pulse, as just after you exercise it beats very fast so it is hard to count the beats. You can also loose count easily if you get distracted. I think that our experiment went well as we got the results we wanted. If I did the experiment again I would make it so that everybody in the group wore a heart monitor so that we could get a true pulse reading instead of quite a rough count. If a heart monitor was not available to everybody though, to make the results more accurate I would make sure that everybody counts their pulse rate after the 5 minute resting period just to check that it had decreased back down to normal (there was not enough time available to do this in the first experiment). I would also experiment with different types of exercise (high and low impact) to try and find out exactly when your heart rate cannot increase anymore.

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