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# The effect of exercise on the body

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Introduction

The effect of exercise on the body Variables I'm going to investigate the effect of exercise on the body. I could investigate the amount of perspiration, the breathing rate or the heart rate. I am going to investigate how exercise effects my pulse rate because I can investigate this more accurately. Step-by-Step plan * First of all I will take my resting pulse rate for a minute. * I will then do step-ups at a constant rate for 1 minute. * After, I will take my pulse rate again for 1 minute. * Then I will allow pulse rate to return to normal. * I will then do step-ups for 2 minutes. * Take pulse rate again for 1 minute. * Repeat experiment, going up in consecutive numbers until doing step-ups for 5 minutes. * Repeat experiment three times. Equipment I will use a step, a stopwatch, and I will also wear trainers. Fair test I will make the test fair by controlling the variables I'm not investigating * I will change the amount of time doing exercise. ...read more.

Middle

This process will give you a faster pulse rate. When a person does vigorous exercise their body can't always supply enough oxygen to their muscles. When this occurs the muscle will start doing anaerobic respiration. Anaerobic means without oxygen, it is the incomplete break down of glucose. Anaerobic respiration is less efficient than aerobic respiration. Oxygen is needed to break down lactic acid to carbon dioxide and water. After anaerobic respiration oxygen is needed to get rid of the lactic acid, this is called the oxygen debt. This is why your heart rate stays high and it takes a while to get your breath back after you have stopped running - oxygen is still being delivered to the muscles to oxidise the lactic acid into CO2. The fitter you are, the quicker you recover. Results Duration of exercise (mins) Pulse Rate (beats per min) Test 1 Test 2 Test 3 Average 0 (resting pulse rate) 76 76 76 76 1 84 86 84 85 2 90 90 92 91 3 100 102 101 101 4 104 103 103 103 5 107 104 106 106 Conclusion I noticed that as I increased the amount of exercise that I did, my pulse rate increased also. ...read more.

Conclusion

The body works harder to remove Carbon dioxide because it is a toxin and will cause cramp. Evaluation I think that my experiment was accurate. I repeated the experiment three times and worked out the average answer. All my results followed a trend and I didn't get any anomalous results. I also let my pulse rate return to normal in between each reading. I kept the step at the same height and the same person took the time for me. I feel that my procedure was suitable because I thought about my plan and followed it carefully. I also repeated my experiment three times to make sure that my results were not anomalous. I don't think I collected enough evidence to draw any film conclusions. To do that I would have to extend the amount of exercise time, that way I may find some patterns that won't have developed after only five minutes of exercise. I would also have to do more than three tests to improve the accuracy of my final results. This would give me more accurate results. I could also extend my investigation by investigating the breathing rate and perspiration rates and see how they relate to each other. ...read more.

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