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# To find out what happens to my pulse rate when I change the position I am in e.g. lying down, sitting down and standing up.

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Introduction

Pulse Rates Aim To find out what happens to my pulse rate when I change the position I am in e.g. lying down, sitting down and standing up. Background Knowledge A pulse is a series of pressure waves along an artery, caused by contraction of the left ventricle of the heart. Things such as exercise and different body positions can alter your pulse rate. Prediction I think that when I take my pulse lying down, it will be the slowest, sitting down will be in the middle and standing up will the fastest. I think this because when you are lying down, your heart does not need to beat as fast because it isn't very hard to pump blood horizontally. ...read more.

Middle

I will take my pulse rate while sitting down 10 times. 3. I will take my pulse rate while standing up 10 times. 4. I will then take averages of all the results then use the averages to compare the different positions. Accuracy I will make my measurements as exact as possible by using a stopwatch to measure a minute while I take my pulse. Taking my pulse rate 10 times, then calculating an average will make my results a lot more reliable that just one result. Fair Testing I will keep the variables (lying down, sitting down and standing up) the same because if I didn't my heart rate would be different and would make it an unfair test. ...read more.

Conclusion

It followed this pattern because when you are lying down, your heart does not need to beat as fast as if you were standing up because it isn't as hard to pump blood straight as upwards. The graph agrees with my prediction, as while I was lying down my pulse rate was lowest, while I was sitting down it was in the middle and while I was standing up, my pulse rate was highest. Evaluation I think that my results were good because I did every position 10 times then took an average, this compensated for any results that may have been a bit higher or lower than my pulse rate usually is, so therefore made it a fair test. I didn't really have any odd results, as they were all around the same area. Ryan Osborn 10IKRD 04/05/2007 Page 1 of 4 ...read more.

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