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Effect of exercise on blood pressure.

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Introduction

Effect of exercise on blood pressure. Research The heart is made almost entirely of muscle. It is a hollow organ that pumps blood around the body and is in the centre of the circulatory system. It is divided up into four chambers: Two atria or auricles situated in the upper part of the heart, whose function is to receive blood. Two ventricles, situated in the lower part of the heart whose function is to pump blood. The average heart rate of an adult is around 60-90 bpm (beats per minute) and blood pressure of 120/80, while resting, With each beat pumping 5 ounces of blood, which is approximately 4,000 gallons a day. The heart rests in between beats so it rests more then it works, so in a 70-year lifetime the average human heart works for about 30 years and rests for about 40 years. When we exercise our heart rate increases. This is because our muscles are working harder and need more energy. Our heart rate increases to supply more oxygen, carried in the blood, to these muscles. The oxygen is needed in the muscles for aerobic respiration that is to break down glucose, which we get from food, into glycogen, which is the main type of energy we use when we exercise. This can be shown in the word and symbol equations: Glucose + Oxygen ? Energy + Carbon dioxide + Water C6H12O6 + 6O2 ? ...read more.

Middle

- The pace of the person doing the exercises, because this will affect the person's blood pressure. Because our test uses the leg and arm muscles repeatedly, the person must rest between each trial so that all the lactic acid can be carried away. - How long the exercise will go on for, I have decided to make this one-minute. Each exercise must take the same amount of time so that I can compare the blood pressures. So my fixed variables are: keeping the same person, the same time, same positions, the same pace of exercises, and the time of the exercises. I will also repeat the experiment 3 times, which has allowed me to work out an average. Therefore this made the reading more accurate. Method 1) First we thought of which exercises to choose for our subject. We decided to use walking, jogging, start jumps, and step-ups. We then set up all the equipment needed 2) To start with we measured each person's blood pressure in the group to see which individuals blood pressure was nearest 120/80 (average persons blood pressure). This was to ensure we did not get anomalous results. 3) Once we had chosen our subject we measured the persons resting heart rate where there was no strain on the muscles. We decided to sit down while taking our blood pressure. If there were any strain on the muscles this would make our results unreliable because it would increase the blood pressure. ...read more.

Conclusion

When one trial was over, and we would be lying down relaxing so that our heart rate would return to normal, we did not account enough time for the lactic acid in our muscles to be carried away. We would not be able to judge if all traces of lactic acid had indeed been carried from the muscles. As the trial was being carried out the body temperature of the exerciser was rising. The heat of the body would increase the blood pressure, which would adversely affect our results, making them less accurate and reliable. The food consumed by the participating people may have contained different amounts of fats, carbohydrates and lipids. This would affect their available glucose levels during exercise. To improve upon this experiment I would increase the amount of times it is repeated, to give a wider range for the average to be taken from. I would make the experiment longer to be able to see if the blood pressure will actually level out and at which point. I could have also carried out all the experiments in the same day, because the breakfast etc. may have changed throughout each day. However, this was difficult to do because we only had a lesson to carry out the exercises. Further experiments I could carry out within my aim could involve exercising different muscle groups of the body. This could show which muscles need the most amount of blood supply. I could also try different intensities of the exercise carried out, by doing them for longer. ?? ?? ?? ?? Sarah Dawson 11V4 ...read more.

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