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Investigate the effect exercise has on pulse rate.

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An investigation to see how exercise affects Pulse rate Task- to investigate the effect exercise has on pulse rate Key Factors * The length that you exercise * The intensity that you exercise * Mood and state of mind * Fitness levels * Resting pulse rate * Health * Diet * Environment (body temp) I have chosen to investigate the length that you exercise for. Prediction I predict that the longer you exercise for the higher my pulse rate will increase o, as it does this I think that it will reach a peak rate and the become steady. I do not think that it will carry on increasing as the length of exercise does after a certain stage. This is how I think my graph will look. The reason that I think the length of exercise will affect my pulse rate is to do with the muscles on my body contracting so that I can do this exercise. The more that I exercise for the more energy that my muscles need so they can contract, therefore the less exercise the less energy that they will need. The way that they are able to this is by the release of energy in the muscle cells they are respiring aerobically, this is the release of energy from the breakdown of glucose by combining it with oxygen inside living cells (the energy is contained within the glucose molecules) Each muscle cell needs a supply of oxygen and a supply of glucose, and they all need to get rid of the waste products water and carbon dioxide. ...read more.


If my exercise in this investigation goes on for too long then I would begin to feel fatigued and result in an oxygen debt, this is due to a lactic acid built up and not enough oxygen reaching the muscle cells. This causes my muscles to stop contracting efficiently. It only produces one twentieth as much energy as aerobic respiration but does this much quicker over a shorter period of time. Glucose --> lactic acid + a bit of energy Plan The apparatus I will use are: * A skipping rope * A stop clock * Trainers I will begin my investigation by getting a friend to take my pulse rate at resting, to do this I will use my first and second finger and not my thumb as it has its own pulse and could affect the accuracy of my reading. This will be done so that after each period of time I do, I will know when it is suitable to do the next length of exercise. Otherwise it would not be a fair test. Next I will skip consistently for 1min the rest and skip for two minutes. I will then repeat this for the consecutive numbers until I am skipping for 5 minutes. It may not be very accurate if my friend takes my pulse rate for 1min each time because the beats per minute might decrease by the end. Therefore I will get her to count them for 30 seconds and then double the result, this may prove to result in more reliable results. ...read more.


Also when my friend took my pulse rate at each interval, it is possible that she may have missed out beats, especially when it got to the longer times such as 5.5 minutes. This also could have affected my results. I did keep all the other key factors the same though so there was not anything that could have made it an unfair test. I think that to overcome the problem of not being able to know exactly how intense I was exercising, it may have been a lot more accurate to have used a piece of equipment from a gym, such as a walking machine, this would have guaranteed that I was exercising with the same intensity each time. With the problem of taking my pulse rate I think that I could use a pulse monitor which is specialised in doing this, that would have really given better readings. To look further into this key factor, I could try doing the experiment with different types of exercise. Then I could have found an average from them all to draw a very accurate conclusion about the relationship between length of exercise and pulse rate. I could also take my pulse rate with specialised equipment in different places on the body such a chest and wrist. An obvious improvement on this investigation would be to have repeated it three times and then found an average. This would have meant that any anomalous results could have been not included in the average. Repetitions increased the reliability of my results. ...read more.

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