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# How exercise affects heart rate.

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Introduction

Investigation-How exercise affects heart rate PLAN Aim- To investigate the effects of exercise on our heart rate Prediction- I predict that the more intense the exercise we do, the higher our heart rate will become. This is because the muscles use the oxygen quicker and so the heart has to pump the blood containing the oxygen quicker as well. Because the exercise I am doing is aerobic, I expect that my heart rate will be directly proportional to the rate of exercise. If the exercise were anaerobic, I would not expect this. Here is my predicted graph to show this: Heart Rate Direct Proportion Rate of Exercise My heart rate will increase because we need energy to exercise. Respiration releases ATP for this. As we need oxygen from the blood for respiration, the heart needs to pump blood to the muscles. As I increase my rate of exercise, this process will need to be quicker. Blood will be pumped quicker to the muscles, so that the oxygen allows respiration, which releases ATP. This is the energy for us to exercise. Method 1. Set up the apparatus as in the diagram 2. Sit still for several minutes, and then take your resting heart rate for the next 3 minutes 3. ...read more.

Middle

OBTAINING EVIDENCE After following my method to highest degree of accuracy I could, I have come up with these results: Resting Heart Rate (bpm) 1 58 2 62 3 60 Average 60 I have worked out an average resting heart rate so that when I draw my graph, this will be my starting point. These are my results from the exercises: Number of Step-ups per minute 20 30 40 60 90 Heart Rate During Recovery Period (bpm) After 1 min 78 96 100 108 112 After 2 mins 63 72 74 93 111 After 3 mins - 60 68 84 90 After 4 mins - - 60 70 78 After 5 mins - - - 62 69 After 6 mins - - - - 63 ANALYSIS I have drawn three graphs to show my results. The first graph shows my heart 1 minute after exercise at the different intensities. The second graph shows my heart rate 2 minutes after exercise at the different intensities. The third and final graph shows the time taken for the heart beat to return to its resting heart rate, after the exercises at different intensities. I have drawn a line of best fit on the first graph because in my prediction, I said that the graphs would show direct proportion between heart rate after exercise and rate of exercise. ...read more.

Conclusion

To do this I would need to use either a stethoscope or a heart beat monitor, which would give me true results. However, a stethoscope could still leave the chance of human error in counting the beats per minute so I think a heart rate monitor would be most accurate. I would need to use straight after the exercises. I would need to make sure that the exercises that I set out to do could be completed and were actually possible. For instance, the exercise where I had to do 90 step-ups in 1 minute; I do not think I actually did that many. This was because it is hard to do 3 step-ups in 2 seconds and also the fact when doing the exercise that quick meant I got fatigued towards the end of the minute and I was not reaching that required exercise rate. If I was to do it again with these improvements, I would also repeat the exercise a few times so that my results were even more accurate and I could work out an average set of results. I think my range of results would have to be changed because of the final exercise, and I would have to limit it to the first four exercises that I did. I think I would do an extra exercise at a lower intensity e.g., 1 step-up every 6 seconds, which would mean I would 10 step-ups in a minute. ...read more.

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