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Coursework Investigation: Plan experiments to determine the effects of exercise on the pulse rate/heartbeat

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Introduction

Plan experiments to determine the effects of exercise on the pulse rate/heartbeat PLANNING I plan to carry out an experiment where I will test the affects of exercise on the pulse. To make sure that all the results are clear, I will ensure my experiments are simple yet effective. In order to get a general idea of the answer to the question, I am going to start by: * Testing someone with an average body frame and body-fitness. * Carrying out two experiments; (i) Measure the heart beat before, during and after one minute of slow jogging on the spot. (ii) Measure the heart beat before, during and after one minute of fast jogging on the spot. This will give me an idea as to how exercise affects the pulse rate as well as seeing if results change by different degrees of difficulty. I will keep all factors in the experiment the same apart from the varying types of exercise in each experiment. There will be minimal equipment needed to carry out the experiment: 1. A stopwatch 2. A stethoscope 3. A suitable table to record results in. Using my own scientific knowledge on the subject, I have made a couple of predictions. When the person starts the exercise, their pulse will not dramatically increase (initially), because this is anaerobic exercise, which is a type of exercise, which does not use up oxygen to fuel the exercise. Instead, the body uses the body's store of carbohydrate (glycogen). ...read more.

Middle

This ensures that the actual experiment will work as I have predicted. The results from the preliminary proved to be as I expected, with the pulse rate slowly increasing with slow jogging, and the pulse rate increasing relatively faster with fast jogging. OBTAINING EVIDENCE I will test only one person to keep the experiment simple, but I will do varying types of exercise. In this way, I can see how the different types of exercise affect the pulse rate and record the results accordingly. I will describe the exercise and pulse rate by giving a detailed description of each one. I will measure pulse rate in 'BPM' I will repeat parts of the experiment which seem irregular to see if the results vary hugely from the original result. If so, there must have been an error in my original experiment, so I will take it again. However, if on the second time round there is a relatively small difference, I will leave the result because irregularities will occur in most experiments. I will present my results in a clearly laid out table where comparisons will be easy to make. On the next page are my results. Below are the results for the effects of exercise during slow jogging on the spot. Slow jogging on the spot Pulse type: resting pulse pulse during the exercise - reading at 30 seconds pulse during the exercise - reading at 60 seconds pulse after the exercise is finished - reading at 10 ...read more.

Conclusion

'When the subject starts the exercise, their pulse will not dramatically increase because this is anaerobic exercise' - This shows in the line graphs. The subject's heart rate increased minimally after 25 seconds of exercise: just a 10bpm increase for fast jogging and 8bpm for slow jogging. My predictions were backed up well; I discovered that the heart rate did increase, mostly due to the factors of: (i) The sympathetic nervous system allows adrenaline into the bloodstream. (ii) The metabolic rate increases. (iii) Carbon dioxide builds up in muscle tissue causing adjustments in heart rate to carry the waste away and replace it with oxygen quicker. EVALUATION I thought my experiment worked successfully. It worked well in conjunction with my preliminary experiment and the outcome was as I expected. The experiment was simple to keep results clear and easy to analyse. However, to improve my investigation I could have tested more people and compare the different fitness levels. Overall, I was pleased with my results and felt they were accurate. In this experiment, there were no anomalies on results graph. This indicates that there were no irregularities, inconsistencies, or errors in my experiment. I ensured the conditions for each experiment were the same. However, a few factors were out of my control. When I did my preliminary test and when I did it the real time round, the subjects fitness could have changed over this period. Furthermore, I could have used a heart-rate monitor to measure a heartbeat more accurately. After my investigations, I have come to the conclusion exercise makes your heart beat faster. ...read more.

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