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The Effect of Exercise on the Heart

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The Effect of Exercise on the Heart Introduction: In this investigation I will try to find out what factors of exercise affect the body. When we do exercise the body is affected in many different ways: 1) Breathing rate: the number of times you take a breath in a minute. The more intense the exercise the more the need for oxygen and glucose to be supplied to the muscles. Therefore the lungs will have breath more times in a minute to meet the demand for oxygen 2) Heart rate: the number of times the heart beats in a minute (BPM). As the rate of exercise increases the heart rate will increase. This is because there will be more demand on the heart to supply muscles with oxygen and glucose, as they are needed to respire. 3) Oxygen uptake: the amount of oxygen you consume in a minute. This varies from person to person because lung capacity varies and the depth of breathing also varies. 4) Ventilation rate: the volume of air breathed in a minute. Because the heart rate (pulse) is the easiest to measure I will measure how it is affected during exercise. You can feel your pulse because the artery walls are elastic and stretch to take the blood. They contract and bounce back to force the blood along. ...read more.


Once oxygen is in the blood the heart needs to beat faster, so that oxygen and glucose get to the muscles that are working faster. However it is quite hard to measure and change intensity so I will not use this. Type of exercise: Some types of exercise involve using more muscles than others. So if more muscles are used more oxygen and glucose are needed, which means the heart rate will increase to pump it quicker. I will not change this variable, as it is not a continuous scale and is difficult to measure. Fitness of person doing the exercise: A more fit person has blood with higher oxygen carrying capacity. This is where the number of red blood cells increases. This makes the blood more efficient at carrying oxygen, so the heart of a fit person does not have to beat as hard or as fast to supply oxygen to the muscles to combine glucose and oxygen. Also a fit persons heart will pump more blood in 1 beat than an unfit person. Frequency of Exercise (no. of reps) If the exercise were repeated more times then the muscles would need to respire quicker. This means that they would need oxygen and glucose as fast as possible, in turn meaning that the heart would need to beat faster to supply the muscles. ...read more.


6) I will have another rest period until my heart rate drops again. 7) I will repeat doing step-ups at the rate of; 30, 40, 50, 60, 70, 80, 90, 100, step-ups with a rest period between each and I will measure my heart rate in BPM each time. I have chosen this range as I am fairly confident that my heart will achieve its maximum B.P.M in the time given so I will have a complete set of readings, and it should also level off on a graph. 8) After a large rest period of a couple of hours, I will repeat exactly as before, twice more, and record all the results. These are check readings and I will take an average for each set of results, to make my readings more reliable. Safety precautions: The safety precautions I will take are to stop if I feel ill and to have someone with me just in case I pass out or get injured. I will also wear appropriate clothing and shoes. 3 Apparatus: The only apparatus that I will need for this experiment is a stopwatch, and a suitable set of stairs. Results Table: No. of step-ups Heart Rate No. of step-ups Heart Rate No. of step-ups Heart Rate 10 10 10 20 20 20 30 30 30 40 40 40 50 50 50 60 60 60 70 70 70 80 80 80 90 90 90 100 100 100 4 ...read more.

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