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# How does exercise affect your heart rate?

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Introduction

How does exercise affect your heart rate? Aim: The heart rate of a human varies from 150 beats per minute in young children, to about 60 in the aged. However, I am not interested in the differing rates between the aged and young, I intend to investigate whether doing exercise may alter the rate or ones heart rate considerably. Variables: Things that we could change in the experiment that could change the heart rate are: * Type of exercise * Speed of exercise * Distance travelled during exercise * Time for exercise * The time I wait before I take my heart rate after an exercise In my investigation the... ...independent variable is the type of exercise, speed of exercise and time for exercise. ...the dependant variable is the number of heart beats in a minute ...the control variables are the time I wait before I take my heart rate after an exercise and the distance travelled during exercise. Independent variables. I will vary the type of exercise between walking, jogging and running so I'm basically just going to be changing the speed and when speed is changed the time taken to travel a certain distance naturally changes as well. Dependent Variables. ...read more.

Middle

* Once my heart rate has returned to its normal heart rate I will repeat the exercise and the steps above twice more waiting in between each set for my heart rate to return to its resting rate. * Once I have walked 30m three times I will move onto jogging the distance. But I will make sure my heart rate has returned to normal before making the change from one exercise to another. * As soon as I have completed my exercise I will take my heart rate by placing two fingers on my wrist and counting the pulses. * I will then record my results. * I will check my current heart rate every minute until it returns to its resting heart rate. * Once my heart rate has returned to its normal heart rate I will repeat the exercise and the steps above twice more waiting in between each set for my heart rate to return to its resting rate. * Once I have walked and jogged 30m three times each I will move onto running the distance. * As soon as I have completed my exercise I will take my heart rate by placing two fingers on my wrist and counting the pulses. ...read more.

Conclusion

The heart needed to pump faster to get a sufficient amount of oxygen around the body quick enough Running and jogging was more strenuous than walking which is why I believe that the pulses didn't increase as rapidly for walking. I also believe that the CO2 levels rose which also contributed to the heart rate rising. 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 same exercises were done at the same rate throughout the experiment. Also, I can not be sure that the distance was 30m as this was secondary information. 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. If I were to extend my experiment I could try different exercises such as star jumps and step ups at different paces to see if this has similar results. ...read more.

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