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# Investigating the effect of exercise on the heart rate

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Introduction

Investigating the effect of exercise on the heart rate Purpose of investigation The purpose of this investigation is to find out what effect exercise has on the heart rate and how much it increases when you exercise Trial experiment For our trial experiment we decided to use moving along as our exercise to increase our heart rates. We measured out 20m with measuring tape and sprint for 100m.We measured our heart rate before and after. Results of trial Heart rate before Heart rate after Person 1 58 180 Person 2 72 200 Method Now that we have done a trial experiment we have came up with a method to do the experiment, which is: We will measure out 20 metres in the tennis courts and sprint up down it. We will start off by sprinting 20m then taking our pulses then wait until our heart rate has gone back to normal then repeat the process another two times so we get an accurate result. Next we will sprint 40m which is the length of the tape measure there and back we will also repeat this 3 times. ...read more.

Middle

I made this prediction because I already no your heart rate increase when you exercise and I know for my age my heart rate should increase between 180 to 220 when I do a bit of exercise like running 100m. When I run 20m my heart rate shouldn't increase a lot so I think my pulse will be 70 beats per minute. The biological reasons for why I no your heart rate increase when you exercise are because when excising each cell increases its demand for oxygen, and at the same time, produces more carbon dioxide, and other waste products. The Co2 has to be cleared out of the blood, as it dissolves in the blood, it raises its acidity. Oxygen has to be brought to the cells. So, the heart pumps more blood around, more blood is pushed through the lungs, and more gas exchange occurs, meaning that the excess Co2 is removed, and extra O2 is taken in meaning the heart rate risen. Distance sprinted in metres Resting heart rate in beats per minute Heart rate in beats per min after exercise Heart rate in beats per min after exercise Heart rate in beats ...read more.

Conclusion

We got two anomalous results these were both caused because we didn't wait until our heart rates had gone back to normal and ran again to soon. We could of made our experiment a lot better by making our method better by finding a method to do where you could be sure you were running at the same pace or if we couldn't do that find another exercise to do instead of moving along like skipping. To make our experiment better we could also improve our equipment by using a 100-meter long tape measure so when we were sprinting we didn't have to go backwards and forwards. Doing more repeats would improve our experiment by doing about 10 repeats or more which would give us a lot more accurate results to get averages from. We could of done a number of further experiments like seeing what happens when you do different sorts of exercise and what happens to the increase to your heart rate when you do this and what the difference is between the new exercise and sprinting. Stuart Macdonald ...read more.

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