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Investigating the factors that may affect a persons heart rate.

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AT1 Aim: INVESTIGATING THE FACTORS THAT MAY AFFECT A PERSONS HEART RATE. Date : 15th February 2002 Teacher : Mr P. Downes Participant : Sacha Selvaratnam (11H) Planning: My main aim for this experiment is to investigate the factors that affect a person's heart rate. Historical data suggests that a fit persons resting heart rate should beat at about 55-60 times per minute, an average person should have a resting heart rate of 70 beats per minute (BPM), and a fairly unfit person will have a resting heart rate of abut 80-90 BPM. There are many reasons why a person's heart rate may alter. These factors include: Age - Usually the younger the person is the fitter they are, therefore the less your heart beats per minute (or BPM). Your heart beats around 70 times per minute when you are resting. The heart rate can rise to around 200 BPM when doing excessive exercise. But sportsmen in general are exceptionally fit and have a lower resting heart rate. Sir Steve Redgrave former Olympic Champion rower has a resting heart rate of 45-50 BPM. Exercise - During exercise you need to get more oxygen and food to your muscles. Your heart beats faster to do this. Exercise, in the long run, will make you look good and feel good. Exercise can improve: your posture, it keeps your bone joints flexible, makes your heart and lungs work more efficiently and it can also help prevent heart disease. ...read more.


If they move quicker there will be more effective collisions. This will take place until the reaction gets to an optimum temperature at which the Hydrogen Peroxide particles will denature This will mainly be due to more and more kinetic energy being produced as the temperature rises. I came to this conclusion from my scientific knowledge. As the temperature increases the Hydrogen Peroxide particles will get charged up and therefore collide into other Hydrogen Peroxide particles and more likely with the potato it's meant to react with. Due to the Hydrogen Peroxide particles colliding more frequently with the potato, there will be a lot of oxygen being given out. This will take place because Oxygen is a buy product of the reaction. Also for temperature, I need to take into account 'The Lock and Key Theory'. Enzymes are affected a great deal by temperature. Enzymes are proteins, at a high temperature the protein breaks down. This means that the active site is changed, so the substrate no longer fits the enzymes active site. The enzyme is now known to be denatured, so therefore no longer works. Testing For Surface Area. When testing for surface area, I must take into account the collision theory. From my knowledge of the collision theory, I know that if a solid (This case potato) is broken down into smaller pieces, it will increase its surface area. This means that the particles around the potato in the solution will have more of an area to work on so there will be a lot more effective collisions. ...read more.


They also do not state which form of exercise they are doing and this means that one person could have been running at 5 miles per hour whilst another could have been cycling at 2 miles per hour. This meant that their method was not very suitable at all. I would change this by making them do a uniform exercise like jogging at 5mph. Other factors which made their method unsuitable were the way in which they measured the results. It looks as if they have asked each person to measure their own amount of breaths they have taken. I have come to this conclusion because Johns result seems to be anomalous. This was probably because he had measured his own result and had probably measured his exhaling separately from his inhaling. This would cause his results to double. A way to overcome this problem would be to use a heart rate monitor and a breath meter (respirator). This would guarantee that the results were accurate. I would also take an average by repeating the test at least 4 times. This would help me because one result may come out with odd results and this would be a way of making that result less affective. It would also ensure they were much more accurate. To extend the investigation I could do another experiment using people with worse lifestyles. I could then compare these results with the ones I had obtained in the previous test to see how peoples lifestyles affects their breathing rate. I could also use more people as the more results I obtain the more accurate the results will be. Sacha Selvaratnam 11H - 1 - 27th January 2002 ...read more.

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