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Investigation of what affects the pulse rate.

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Investigation of what affects the pulse rate. PLANNING: Variables: Factors that I can think of that will affect your pulse rate: * Exercise. * When you are scared, nervous, excited or alert. * When you suffer an asthma attack. * Drugs. * When you feel cold. * When you take stimulant. I.e.: coffee or tea. * Heart disease. * Low oxygen level places. I.e.: high mountains. Aim: To investigate how exercise will affect your pulse rate and why. Prediction: I think if I do some exercise, then I will increase the amount of my pulse pumping, and that's because your lungs are taking in more oxygen as you are breathing in quicker during doing exercises beforehand. And that's because your muscles need more oxygen from the lung in order to act properly, and that's because our body needs oxygen to make energy, and our muscle needs energy to work. So your heart needs to pump faster in order to get the oxygen around the body. I think if I do 15mins of main activity non-stop, then my pulse rate will increase 2 and a half times because from my research, I found out that for a normal person, their resting rate is around 80per minute and their maximum rate is around 200per minute, that's why I make this prediction. ...read more.


So I think the pulse rate will pump faster as the ratio is 2:1. Low oxygen level places (High mountain): this affect your pulse rate because it decreases your oxygenated blood level, which means if you need to have the same amount of oxygen pumped around the body in the high oxygen level places, your heart might need to pump two or three times as much, therefore, it increases your heart and pulse rate. I think my predictions for my exercise investigation and my explanation for the others are correct because I have double-checked most of them in books, but some of them, they are not looked up in books, they're from my scientific knowledge. Method: In this investigation, I won't investigate all the factors that will affect the pulse rate, because some of them they are impossible for a healthy person to do in school. I.e. when someone is dieing. So what I am planning to do is to choose one factor and experiment it. Therefore, I only need to do one experiment, and it will be explained clearly below. * Exercise: I will achieve this experiment simply by me doing some exercise and to get myself tired. ...read more.


Diagram To make sure that it is safe, I have to be careful of everything that I do when I'm playing sport, and also, I have to do the warm up before I do sport, as it's crucial! To achieve a fair test, I need to not do any sport before, so I have a stable normal heart rate at the time I actually start doing the experiment. I will put all the results down on a result table, which will be shown on the next page. APPARATUS: * Stop watch. * Basketball and basketball court (plot or sports hall). * Sports kit. Result table (SAMPLE). How many beats in 15 seconds. How many in 1 minute. First pulse rate (the resting rate) Second pulse rate (warm up rate) Third pulse rate (after exercise rate) Fourth pulse rate (cool down rate) Fifth pulse rate (after exercise resting rate) The difference box is to show how many beats are there to show an increase or decrease pulse rate after doing exercise but cooled down. This is only a sample of all my result tables, because I need to repeat my exercise 5 times, so I need to have 5 tables filled in at the end of my coursework and so this is just an example. ...read more.

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