Effects of exercise
on our heart rate
I am trying to carry out an investigation where I can find out about the effects of exercise on our heart rate. I will have to do various experiments with different variables such as the amount of exercise, the intensity, or the environmental conditions to obtain valid results for my investigation. I will try the experiments on two males to see if there is a difference between two people.
My prediction is that as the intensity or the length of the exercise increases the heart rate increases too, the need of oxygen in the muscle tissues due to the crave in the muscles to create the energy to keep going. I also predict that the heart rate will stay high after the exercise is finished due to the oxygen debt in the muscles and the need to recover from exercise.
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I am planning to do this experiment using different variables such as length of exercise and different types of exercise to see how each of them affect it. I will repeat the experiment twice and get an average of the results to obtain the maximum accuracy.
1 step- I will take my pulse before beginning the exercise with a heartbeat monitor.
2 step- I will do a warm up to prevent injury and I will write down my pulse after it.
3 step- I am going to run for five minutes taking my pulse every 30 seconds. This will be tested on myself and another person to see if there is a difference in the results.
4 step- I will also jump for three and a half minutes to see the difference between exercises.
5 step- After the exercise I will continue to record my results to see how much time is needed to recover to the initial heart rate.
Person A Person B
At rest = 72 At rest = 65
After warm up= 86 After warm up = 82
Skipping with a rope
Person A Person B
At rest = 73 bpm At rest = 65 bpm
After warm up = 97bpm After warm up= 87bpm
You can observe that person A’s heart rate increased rapidly during the first three minutes but Person B’s heart rate work more calmly all through the experiment although it reaches nearly the same maximum heart rate achieved in the experiment as person A. This clearly shows that person A has a lower level of fitness than person B because his heart rate increases quickly during the first three minutes while person B’s heart rate is quite steady and doesn’t show great increases between each result. In the end both the heart rates get approximately to the same reading and this may be explained by the fact that Person A has a large amount of Fast twich muscles fibres therefore, eventhough he gets tires quicker his heart rate gets to the same reading as person B that has slow twich muscle fibres and can run for the same amount of time without his heart rate increasing so drastically but still getting to the same point as person A.
Also 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. This resulted in lactic acid being formed. Finally, the CO2 levels also rose which also contributed to the heart rate rising.
My results where quite reliable as I used a heartbeat monitor to do the experiment which enabled me not to stop to take my pulse while I was doing the exercise.
The evidence that I have collected during this experiment is enough to enable a firm conclusion to be drawn. This conclusion is as I had predicted that exercise increases your heart rate and also the intensity or the duration of the exercise clearly affect the increase in heart beats.
A way in which I could improve my method would be by including other variables like the temperature or the place where the experiment has been done.
Another thing that affects the accuracy of the experiment is that I couldn’t know if I was performing at the same intensity during the whole experiment. I could make this factor disappear if I used a running machine so I could always run at the same intensity.