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Exercise and Heart Rate

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Introduction

Exercise and 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. ...read more.

Middle

Results Table Time (min) Heart Rate (per minute) 1 2 3 Average 0 64 64 64 64 1 68 68 70 69 2 100 94 92 95 3 116 120 122 119 4 140 142 140 141 5 140 148 146 145 6 116 120 122 119 7 76 102 84 87 8 68 84 66 73 9 64 74 64 67 10 64 64 64 64 Analysis The graph shows that the heart rate didn't increase a huge amount for the first minute but then increased very steeply for most of the rest of the exercise. However, during the final minute the heart rate doesn't increase much at all. This happened because the supply of Oxygen to the muscles decreased, a lot of energy will be used up as the exercise took place, the body was unable to continue aerobic respiration and anaerobic respiration took place. ...read more.

Conclusion

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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