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The effect of exercise on the heart rate.

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Introduction

AT1 THE EFFECT OF EXERCISE ON THE HEART RATE Plan and Prediction: I will conduct an experiment accurately and suitably, which will give evidence to prove my prediction correct. Firstly I will carry out preliminary tests, which will tell me which exercise will raise the heart rate more and give the best results. The exercises I will test are: step-ups, skipping, sit-ups and jogging on the spot. To test these different exercises I will time each of the exercises for thirty seconds then measure the heart rate. I will repeat these preliminary tests to ensure the results will be fair. Unit of exercise Heart rate after 30 seconds of exercise (bpm) 1 2 3 AVERAGE Jogging 116 120 124 120 Sit-ups 88 100 112 100 Skipping 136 112 96 115 Step-ups 84 92 80 85 These preliminary tests showed that jogging increased the heart rate the most and as long as it is kept at a constant pace the results should be accurate. This is the exercise I have chosen to do for the experiment. I will measure the resting heart rate of the person exercising by counting the number of beats per minute (bpm) in fifteen seconds and multiplying it by four. I will then take the bpm after the person has done thirty seconds of exercise, then again after forty and so on adding an amount of ten seconds each time up to ninety seconds. ...read more.

Middle

The platelets are another of the bodies defence mechanisms against germs, they clump together when a blood vessel I damaged and form a meshwork of fibres to produce a clot. Glucose is enters the body through eating carbohydrates. All carbohydrates, whether complex or simple, are digested in the body to form glucose, which is transported around the body via the blood and taken into cells to be converted into energy. Excess glucose is converted into glycogen, which is stored in the liver or in fat around the body. If the body needs more energy, glucagon converts the glycogen back into glucose. It is then released back into the bloodstream. During respiration oxygen is used to release energy from glucose. Energy is vital during exercise. In this case of exercising the respiration that will occur will be aerobic. Aerobic respiration is the release of energy from the breakdown of glucose by combining it with oxygen inside living cells. The equation is: Glucose + Oxygen ==> Carbon Dioxide + Water + Energy The glucose and energy are brought to the respiring cells by the bloodstream. The carbon dioxide is taken by the blood to the lungs, and exhaled. The water passes into the blood and is lost as sweat, moist breath and urine. The energy is used for muscle contraction, metabolism and maintaining temperature. ...read more.

Conclusion

For ultimate reliability instead of using a stopwatch to time the duration of exercise, and using your fingers to count the beats per minute on your neck I would use a heart monitor connected to a computer that would display the results in an on-going graph. This would allow the person to continue the exercise whilst the heart monitor records the heart rate instead of exercising for a short period of time then taking their pulse, allowing it to return to normal and starting again. I would also use a treadmill instead of jogging on the spot. This keeps the exercise at a constant rate and records the exact length of time, and occasionally the distance, the person exercising has done. To provide a more reliable way of testing my prediction I would widen my range of results. To do this I would lengthen the amount of time exercising to investigate what happens when the person exercising reaches a certain point and weather when they reach this point their heart rate no longer increases. I would display all of the data in a graph. The conclusion I have come to is valid as I know that although the evidence I have gathered is perhaps not as reliable as it could be, if I were to repeat this investigation I know which area's need improving and I would then be able to produce a better display of evidence. Jo Cunningham 10P2 ...read more.

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