Effects of Aerobic Exercise on Heart Rate Essays

808 Words Sep 27th, 2013 4 Pages
The Effects of Aerobic Exercise on Heart Rate
Introduction: Our bodies need to be in balance in order to function properly, and there are many ways the body maintains balance, or homeostasis. Homeostasis is the maintenance of nearly constant conditions in the internal environment. Our normal heart rate is an example of our body in homeostasis and any sort of change, or stimulus, can alter it. Exercise, adrenaline in the blood, and a low blood pH are all stimuli that increase the heart rate. Exercise, for example, stimulates stretch receptors in the muscles. These receptors then send a signal to a part of the brain called the medulla oblongata that receives the sensory input. It then in turn sends nerve impulses to the sinoatrial node
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• Subjects did exercise session. They walked down 57 stairs and then back up those same 57 stairs for a total of 104 stair steps. This was done at a pace of 85 beats per minute. The whole session took 1 minute 45 seconds.
• Subjects immediately took their heart rate after they completed the exercise.
• After 1 minute of completing the exercise, subjects measured their heart rate again. This was done at 1 minute intervals for a total of 5 heart rate measurements after completing the exercise.
• All together, subjects took 6 heart rate measurements: 1 before the exercise, and then 5 after the exercise.
Data/Results: See attached graph and table.
Conclusion/Discussion: The data shows that heart rate increases during and after exercise and begins to drop back down close to the basal rate after rest. The heart progressively decreases after each minute of rest. Our results show a negative feedback mechanism was used to control the heart rate after exercise. The increased heart rate stimulated the medulla oblongata which sent impulses to the sinoatrial node of the heart to slow down contractions and decrease the heart rate. Different subjects had differences in the time it took for their heart rate to drop after the exercise, but heart rate decreased nonetheless. Overall, our hypothesis was shown to be correct from the experiment. We chose the heart rate as our variable because it is easy to measure and gives clear results. We predicted that the heart would

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