Investigating the Effect of Exercise on the Body

Investigating the Effect of Exercise on the Body
Plan 1. I measure my resting pulse rate. 2. I step up and down on a bench 15 times in 1 minute. 3. I measure and record my pulse rate, and then wait until it is back to normal. 4. I step up and down on a bench 20 times in 1 minute. 5. I measure and record my pulse rate, and then wait until it is back to normal. 6. I step up and down on a bench 30 times in 1 minute. 7. I measure and record my pulse rate, and then wait until it is back to normal. 8. I step up and down on a bench 60 times in 1 minute. 9. I measure and record my pulse rate. To make it a fair test I will do the above twice and take the average. I will use the same bench every time. Also, my partner will do the same to see if we get the same pattern. I think that the more steps we do in a minute the faster our pulse rates will be, because our hearts will have to beat faster to pump more blood (containing oxyhaemoglobin) to our muscles, as muscles need oxygen to move. Results My resting pulse rate: 88 bpm. Number of steps per minute 1st attempt 2nd attempt Average 15 96 104 100 20 128 112 120 30 128 132 130 60 148 152 150 My partner?s resting heart rate: 84 bpm. Number of steps per minute 1st Attempt 2nd attempt Average 15 104 108 106 20 112 112 112 30 136 124 130 60 152 156 154 Conclusion My prediction was right: as my graphs show, the more steps we did per minute, the faster our pulse rates were.
I think this is because of the reason I stated with my prediction. I have also included some background research information which gives some more detail into the factors which could affect your pulse rate: Background Research Information Blood and red blood cells The blood is a transport system for glucose and oxygen to be delivered to all the cells in the body, and for carbon dioxide and other wastes to be removed. The heart pumps blood around in arteries and veins, through the pulmonary circuit and the systemic circuit. Blood is made up of plasma, platelets, red blood cells and white blood cells. Red blood cells carry oxygen around the body by making it react with a pigment called haemoglobin. Respiration Respiration is a life process, which means that all living things have to do it. Plants and animals need energy to stay alive. Food materials contain energy. Chemical reactions release this energy. The process of releasing energy from food chemicals is called respiration. Aerobic respiration This sort of respiration is using oxygen to react with food chemicals to release energy. Muscles and their action Most muscles have to be stimulated by nerve impulses before they will contract. The muscle which contracts and the nerve which transmits the impulse both require energy. When muscles have to work without oxygen they build up lactic acid. Too much lactic acid can cause cramp. Therefore, when you are doing physical exercise the heart has to pump blood round the body faster, so that muscles get more energy and oxygen, than when you are resting. Muscles get rid of lactic acid by going into oxygen debt. Oxygen debt is when you have finished exercising and are breathing heavily to ?get your breath back?. Evaluation I think my investigation was fairly accurate. There weren?t many anomalous results, as you can tell by how close the points on the graphs were to the lines of best fit. However, it could be improved by using modern technology, such as heart rate monitors. I think I must have counted a couple of extra beats when measuring my pulse rate after my first attempt of 20 steps per minute, so a heart rate monitor would be very useful for providing an accurate measure. Perhaps the lines of best fit would have been more accurate if there were more points on the graph to go by, e.g. if we had done 40 and 50 steps per minute. We could have gone on to see whether there is a difference in the gradient of the lines of best fit between different groups of people, e.g. adults and children, boys and girls, or smokers and non-smokers. Overall, I am happy with the accuracy and fairness of my investigation and I think my findings are quite reliable.

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