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How does Exercise affect the pulse rate

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Nazneen Rajabali How does Exercise affect the pulse rate? What is the pulse? The pulse is felt by the beating of the heart or blood vessel. The pulse is specially felt when a finger is put on top of an artery. In an artery, the pulse is felt when the artery expands and contracts. The walls of the artery are made up of elastic walls. The contracting of the heart muscles forces blood into your arteries and because the walls of the arteries are elastic they can take this pressure. They expand and contract as the blood is pushed through and this is what is felt as your pulse. To feel your pulse you need to find a main artery in your body. The most common place to find a pulse is on your wrist or the side of your neck. The resting pulse of an average human is 70 beats per minute. However, during exercise the rate my increase to 200 beats per minute. Prediction I predict that by increasing the amount of exercise I do, my pulse rate will also increase. I have researched and used my scientific knowledge to predict this. ...read more.


Blood gets pushed to the parts of the body that is needed the most and less where it is not needed. For example, during exercise more blood is needed from the guts to the legs. To make this happen blood vessels widen and constricts at different points. This is called, vasodilatation and vasoconstriction. During exercise or when playing sport the increased respiration in the muscles generates more heat and therefore the blood gets hotter. To cool the body down more blood is pushed close to the skin. This makes the persons skin red. Lastly, the body also sweats a lot which cools the body by evaporation. Immediately after exercise, the pulse will still be higher than normal, because the muscle may have used more energy than the blood could supply in the form of oxygen and glucose. The muscle will have to repay this "oxygen debt" by taking in more blood than normal for a time. Equipment To do my experiment I will be using a stopwatch. I need to use a stopwatch to record how long I have been walking and then to test my pulse per minute. ...read more.


Results Here is a table of my results: The table of results show that the longer you exercise the higher your pulse rate goes up. As the muscles started to work harder respiration was taking place in the body to provide extra energy for the muscle fibers. Breathing also increased to remove the carbon dioxide and consequently the heart started to beat faster pumping the blood faster around the body. The increased respiration in the muscles generated more heat and therefore the blood got hotter. As the pulse rate went higher the arterioles widened so that the blood pressure wouldn't get to high. In conclusion, the evidence gathered which is shown in the table above shows that my prediction is to be true. I predicted that my pulse rate would increase as I exercised more. The outcome of this experiment met all the criteria's for a reliable result. However, this result would have been very different if one or more key variables were not met. For example, if the person was overweight, asthmatic, under medication or even pregnant. Additional further work could be provided if the researcher wanted to predict whether pulse rate affected when one or more key variable was used. ?? ?? ?? ?? ...read more.

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