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How Exercise affects heart rate

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Introduction

How Exercise affects heart rate Aim My aim is to find out how exercise affects heart rate, I am going to find this out by doing Sit ups and taking my pulse and seeing how much it increases / decreases as I do sit ups for a longer amount of time. To get a good pulse I am going to take my pulse over 15 secs and times it by 4 this will give me a closer pulse than waiting for a minute because it would then increase / decrease as I measured it. Safety I am going to make this experiment safe by: 1. Warming up and down 2. Not over doing my self 3. Taking a rest after each time of sit ups 4. Not doing sit ups near a wall or table. ...read more.

Middle

The result of the muscles not getting enough oxygen leads to a by-product of Lactic acid, you can feel this when your are doing exercise by a burning sensation in your muscles. This can be dangerous so when you get a build up of lactic acid you should slow your rate of exercise and rest till the sensation subsides. My Results Exercise time In min Resting heart rate Pulse 1 2 3 Averages 1 67 68 68 100 82 2 68 100 116 110 112 3 68 136 128 116 127 4 68 148 143 147 146 5 67 157 155 153 155 My results are shown in the graph, the one average Anonymous result is circled. This shows my results are precise and accurate, this means my results are accurate enough to make a firm conclusion. ...read more.

Conclusion

Back Ground Knowledge When your heart muscles contract they force the blood into your arteries. Each beat of the heart pumps the blood along under high pressure. The artery walls are elastic and stretch to take the blood. Then they contract and bounce back to force the blood along. This bouncing back can be felt and is called the "PULSE". The rate at which blood is pumped around the body depends on the heart rate, During exercise, the cardiac out-put must be greater than while at rest. This is because the muscles need a constant supply of Oxygen to create the ACP, which is needed for the contraction of the muscles. Also the blood needs to carry the Carbon dioxide away from the muscles. During exercise the muscles need food and oxygen while getting rid of carbon dioxide so the pulse beats faster to make this all possible. ?? ?? ?? ?? Luke Hammond ...read more.

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