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# An experiment to find the effect of exercise on pulse rate

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Introduction

Claire Weller An experiment to find the effect of exercise on pulse rate PLAN Aim: To conduct an experiment to find out what the effect of exercise is on pulse rate. Equipment: Skipping rope, stopwatch/clock, cd player. Method: I am going to conduct an experiment to find out what the effect of exercise is on pulse rate. I will use a skipping rope to skip for different amount of times, but at the same speed. I will then record my heartbeat by counting how many beats I have in 30 seconds, and multiply this by two, to get a number of beats per minute, which is my heart rate. I am going to do 7 tests for each experiment, from 0 seconds to 180 seconds (3 minutes). I will do the experiment 1 time only, as I am unlikely to get any anomalous results. If I happen to find an anomalous result, I will do that particular timing of exercise again, until I get a better and more accurate result. I will record the results on a table, and plot them on a graph to show any patterns or correlations in the results. ...read more.

Middle

Extra carbon dioxide is produced by your muscles at this time, and this starts to build up in your bloodstream. The brain senses this is happening, and it sends nerve impulses to the heart making it beat faster, which is an automatic reflex. Due to this happening, more blood can then be sent to the muscles. The arteries attached to the muscles open up, whilst the arteries attached to other less needy organs get narrower. This way extra blood is diverted to the organs that need it most. I am expecting my graph to look like this As you can see, my heart rate increases at a steady pace, corresponding to the increase in exercise, so my graph has been drawn as a smooth curve. ANALYSIS In carrying out my experiment, I found that I had no anomalous results and I therefore did not need to repeat any measurements. I recorded my results on the table below: Duration of exercise/ seconds Beats per 30 seconds Beats per minute (bpm) Difference in heart rate to standing rate/bpm to standing rate/bpm 0 = standing rate 36 72 0 30 74 148 76 60 87 174 102 90 97 ...read more.

Conclusion

After this stage, it is constant. I drew up a table of results, then produced a graph. Using the points plotted on the graph, I managed to draw a smooth curve which is evidence that my results were reliable. There were no anomalies in my experiment, but there are ways of improving the experiment to make the results more reliable. You could use a machine to monitor heart rate, instead of feeling for it yourself, as you may miss out a few beats or add a few on accidentally. You could also use a treadmill instead of skipping as your exercise, so that you get even amounts of exercise. If I could conduct my experiment again, I would do it all in one day, to make sure that my starting pulse is always the same, which would make my results more reliable and accurate. Also, to extend the experiment, I could measure how long it took for my heart rate to get back to its normal standing rate, which would be an indication of how efficient my muscles were. ...read more.

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