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How exercise affects the pulse rate

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How exercise affects the pulse rate Planning Aim I am going to investigate the effect of exercise on a person's heart rate. In this investigation I will be doing different intensities of the same exercise to see how much the subject's heart rate increases. Hypothesis: I predict the harder the subject exercises, the higher the subjects heart rate would be. The amount of exercise a person does will affect the pulse rate. For example, more exercise means more movement so more energy will be needed. In order to get more energy; respiration needs to take place at a faster rate. More oxygen is used so more carbon dioxide is produced. Carbon dioxide is a waste product and it must be removed, as it is a toxin. Because of the extra carbon dioxide being produced, blood is pumped around the body faster in order to transport it. This process will give you a faster pulse rate. You will also get cramp if lactic acid is produced due to not enough oxygen being taken in. This is known as respiring anaerobically. This can happen during exercise, when breathing and the circulatory system cannot provide enough oxygen for our muscles to keep going aerobically. Anaerobic respiration is less efficient than aerobic respiration. Oxygen is needed to break down lactic acid to carbon dioxide and water. The required amount of oxygen to get rid of the lactic acid is called the oxygen debt, which must be paid off immediately. ...read more.


I will always take my subject's pulse rate because I will be using this same person to perform throughout the experiment. I will make sure that I start my exercise using the same starting pulse rate because if each of my resting pulse rates is different then this would affect the accuracy of the results and this would be doing the experiment incorrectly. I will get the same person to take the time while I exercise because if someone else does it they may not count as accurately or as the same speed as the other person, which may affect the precision of the results. I will repeat the experiment because the first time the subjects heart rate might be faster than normal because of the anticipation of the experiment and they might get a bit excited. I will average the two reading to make it fair. Safety: I will make sure that my subject is wearing trainers, as otherwise they will hurt my ankles. I will also make sure that the step is on flat surface. Analysis: I noticed that as the intensity increased of the exercise that my subject done, their pulse rate increased also. The subject's pulse rate increased at a steady rate, roughly going up at 10 - 12 beats per minute. My graph tells me that as the intensity of the exercise increase so does the subject's pulse rate. ...read more.


That conclusion is, the more complex exercise you do the faster the heartbeats. I believe that my experiment is reliable in proving the objective. I repeated the experiment twice and in between I always let the subject's pulse rate return to normal. I kept the step at the same height and the same person took the time. All of my results fitted into the general pattern. I think that my results are reliable as I followed my plan. I also made sure that it was a fair test. I tried my best to keep the experimentation as fair as possible. The same person took the time for me and I done the exercise at a constant speed. I feel that my procedure was suitable because I thought about my plan and followed it carefully. I also repeated my experiment twice to make sure that my results were not very anomalous. However there were some factors beyond my control that could have affected my results. They were, the temperature outside on the two separate occasions, I did my first run through of the experiment and the repeat experiment. The subject's fitness could have changed over the period between the first run through and the repeat experiment. I could have used a heartbeat monitor to accurately measure the subject's heartbeat. To improve my investigation I could have tested more people and compare the fitness. I could also take a skin temperature reading which could tell me if people get hotter or colder doing exercise. ...read more.

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