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I am going to investigate my bodies heart rate when I exercise for certain fixed amounts of time.

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Introduction

INTRODUCTION: I am going to investigate my bodies heart rate when I exercise for certain fixed amounts of time. Blood is fluid that circulates in the arteries and veins of the body. Blood is bright red or scarlet when it has been oxygenated in the lungs and passes into the arteries; it becomes bluish red when it has given up its oxygen to nourish the tissues of the body and is returning to the lungs through the veins and the tiny vessels called capillaries. In the lungs, the blood gives up the carbon dioxide wastes it has taken from the tissues, receives a new supply of oxygen, and begins a new cycle (this happens at a fast rate whilst exercising). This movement of blood is brought about by the coordinated activity of the heart, lungs, and blood vessels. The heart is the organ that pumps the blood and circulates it around the body. The circulatory System is the course taken by the blood through the arteries, capillaries, and veins and back to the heart. In humans, the heart is made up of four chambers: the right and left auricles, or atria, and the right and left ventricles. The right side of the heart pumps oxygen-poor blood from the cells of the body back to the lungs for new oxygen; the left side of the heart receives blood rich in oxygen from the lungs and pumps it through the arteries to the various parts of the body. ...read more.

Middle

it equal to a minute to prove my prediction that your heart pulse will start to steady back to a normal rate if you measure it for a whole minute. This would happen because the muscles have stopped being worked hard so they don't demand as much so the heart will start to beat slower. These are my results. time (secs) pulse pulse pulse average x to make a minute 15 20 20 21 20 80 30 37 38 38 38 76 45 56 56 55 55 68.75 60 77 66 67 66 66 VARIABLES: The variables for this experiment could be: 1. type of exercise-because some exercises are a lot more tiring than others so if you were doing a strenuous exercise such as sprinting for 30 seconds your heart pulse would be a lot faster than if you did sit ups for 30 seconds. 2. fitness of person-because some people are fitter than others so there would be different levels of heart rate. The difference is that the fitter person would find that their heart pulse after exercising is lower than that of a person less fit than them. 3. sex-because the fitness of the two sexes are rarely the same. The difference varies but there is a distinct difference between the two sexes because often the male has a larger lung capacity and stronger muscles so exercise is easier for them. ...read more.

Conclusion

APPARATUS: a step (to do the step ups on), a stopwatch and a calculator. SAFETY: When you start the physical part of the investigation you need to make sure you are a fair distance away from everyone else. You should also make sure you don't exercise immediately after you have eaten to avoid indigestion. Work with a partner so if you fall over he can help you. METHOD: 1. Set up the apparatus and ensure you take the safety precautions stated above. 2. Measure your pulse with two fingers on your wrist just below your hand. 3. Measure your pulse whilst relaxing for 15 seconds (using a stop watch), then times your result by 4. 4. Do the step ups every 2 seconds for 30 seconds then measure your pulse for 15 seconds and times your result by 4. 5. Do the step ups every 2 seconds for 1 minute then measure your pulse for 15 seconds and times the result by 4. 6. Do the same as in 4 and 5 but exercise for 1.5, 2, 2.5, 3, 3.5, 4, 4.5 and 5 minutes. 7. Record all results. 8. Redo the whole investigation 2 more times to check your results are the same (if your result are similar then you can assume they are reliable) and make an average. 9. Display your results in a line graph form. 10. Pack away your apparatus. TIME EXERCISE DONE FOR (secs) pulse PER MINUTE (15 secs. X 4) pulse PER MINUTE (15 secs. X 4) pulse PER MINUTE (15 secs. ...read more.

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