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The Effect of Exercise on Heart Rate

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Introduction

The Effect of Exercise on Heart Rate Introduction The heart rate of a human varies from 150 beats per minute in young children, to about 60 in the aged. However, I am going to investigate whether doing exercise may alter the rate substantially. Prediction From my scientific knowledge I predict that the rate of respiration will increase as a result of exercise. I think that there will be a gradual increase to begin with, but as the body has to work harder I believe that the heart will then increase at a faster rate. When the exercise is complete I think that the heart rate will gradually decrease back to the resting pulse rate. I have made these predictions because I believe that the supply of Oxygen to the muscles will decrease which will push the heart rate up. I also think that a lot of energy will be used up as the exercise takes place, thus resulting in a further increase. If the body is unable to continue aerobic respiration anaerobic respiration will take place. This results in lactic acid being formed. Finally, the CO2 levels would also rise which would also contribute to the heart rate rises. Method I am going to carry out step-up exercise on a 3cm stair on my eleven-year-old sister. The heart rate will be taken by feeling the pulse in the neck. ...read more.

Middle

For instance, I cannot be sure that the step-up exercise was done at the same rate throughout the experiment. Also, I am not sure that the 30-second intervals were kept exactly to this timing. If I were doing this experiment again I would have to look closely at the method of exercise I used. I think that exercising on a piece of equipment like a running machine would produce more accurate results because I would be able to guarantee that the exercise remained constant throughout this experiment. Finally, an actual 'pulse-meter' might have helped the experiment to be more accurate. This is simply strapped round the chest of the exercise and it measures your current heart rate. I believe that this would produce a more accurate heart rate and destroyed any necessity to have the 30-second breaks during the exercise. The Effect of Exercise on Heart Rate Introduction The heart rate of a human varies from 150 beats per minute in young children, to about 60 in the aged. However, I am going to investigate whether doing exercise may alter the rate substantially. Prediction From my scientific knowledge I predict that the rate of respiration will increase as a result of exercise. I think that there will be a gradual increase to begin with, but as the body has to work harder I believe that the heart will then increase at a faster rate. ...read more.

Conclusion

This is because during the exercise anaerobic respiration begins to take place therefore the body has to pay back that oxygen back when it is resting. Therefore, when the exercise is complete the body's heart rate does not immediately return to the normal resting pulse rate. This is because of the pay back the body has to complete first. After two minutes after the exercise is complete the decrease rate then begins to gradually fall as the pay back becomes complete. Evaluation Although I believe that my experiment produced fairly valid results, I am not sure that my experiment was particularly accurate. For instance, I cannot be sure that the step-up exercise was done at the same rate throughout the experiment. Also, I am not sure that the 30-second intervals were kept exactly to this timing. If I were doing this experiment again I would have to look closely at the method of exercise I used. I think that exercising on a piece of equipment like a running machine would produce more accurate results because I would be able to guarantee that the exercise remained constant throughout this experiment. Finally, an actual 'pulse-meter' might have helped the experiment to be more accurate. This is simply strapped round the chest of the exercise and it measures your current heart rate. I believe that this would produce a more accurate heart rate and destroyed any necessity to have the 30-second breaks during the exercise. ...read more.

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