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How does exercise affect the heart rate?

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Introduction

Task: how does exercise affect the heart rate? Introduction: The heart is a four chambered pumping muscle, it pumps oxygenated blood around the body, the oxygen is transported via the red blood cells to the muscles, where the oxygen is used as part of respiration (the creation of energy from glucose and oxygen). Our test is to find out how exercise affects the heart rate. We already know that as muscles are exercised they require more oxygen, this makes the heart beat quicker to pump extra blood around the body. You can tell how healthy a person is with how long it takes their resting heart rate (heart rate after no activity for around 10 minutes) to return to normal. The more the heart fills with blood the more the fibres of the heart stretch, this means the heart is more elasticised and can pump the blood round further with one beat. If the heart beats more effectively, it doesn't have to beat as often, meaning you get tired slower, recover quicker and overall, live for longer. ...read more.

Middle

To work out your target time, add together your 200m slow time, and half of your 200m sprint time. 11. Do this exercise at least 3 times, recording your heart rate at 1-minute intervals until it returns to your resting heart rate. Prediction: I predict that as we exercise for longer or harder, our pulse rate will rise and take longer to return to my resting heart rate (around 70 beats per minute). My breathing rate will quicken and become more laboured as my body requires the extra oxygen, and my muscles will begin to be ached and fatigued as they are exercised over time, making my performance level go down. Results: Exercise Test number: Heart rate after 1 min Heart rate after 2 min Heart rate after 3 min Heart rate after 4 min 200m gentle rowing 1. 2. 3. 90 84 82 84 80 78 80 76 75 74 70 70 200m moderate speed 1. 2. 3. 130 116 110 86 105 95 82 82 83 76 76 77 200m sprint rowing 1. ...read more.

Conclusion

I have therefore come to the conclusion that my heart rate recovers quicker when it rises to a higher rate, perhaps because the heart works harder to cool down when it is working extremely hard. Evaluation: I did not find this experiment scientifically sound at all, many things should be improved before making any definitely true conclusions from the experiment. Firstly the rowing machines, advanced as they are, did not take our heart rate during exercise, this meant that we A: had time to recover before taking our own heart rate, and B: we had to take the heart rate ourselves, giving a possibility of miscounting or being inaccurate with results, this could be remedied by either using rowing machines with built in heart rate sensors, or using a heart rate reader while exercising. Secondly the chances of us putting in the maximum effort possible isn't very likely, though driving us to reach target times was an effective way of making us work hard, we still could probably have worked harder, changing the rowing machines resistance settings would help us to achieve maximum effort input. ?? ?? ?? ?? Oliver Millington ...read more.

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