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# Effect of Exercise on Heart rate.

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Introduction

AS Coursework Biology Plan Skill A and B: Effect of Exercise on Heart rate. Aim: To devise an experiment that can investigate the effect of exercise on heart rate. Independent variable: The exercise I will use is running. The variable I am going to manipulate is the speed. I will change the speed at different constant intervals from 6 kph to 16 kph. I will use the speeds of 6,8,10,12,14,16 kph (kilometres an hour). I will use this range so that my maximum heart rate I reached and my heart rate will change on the minimum speed. I will use a treadmill to run so that I can use a constant accurate speed which I can control. This is unlike a rowing machine or step cycling machine because you determine the speed on how fast you row or cycle. However with a treadmill the speed is determined by the treadmill. ...read more.

Middle

Control: The control in the experiment will be my resting heart rate. Dependent variable: The variable I will measure is the heart rate. I will use a heart rate monitor which will measure my average heart rate per minute. I will use a chest strap and a reader which are on the treadmills to do this. I will measure the heart rate at the different speeds for 2 minutes and record the final heart rate at the end of the 2 minutes. I will work with a partner so someone else can record the data while I do the exercise. I will use 2 minutes because I found it is the minimum time but the optimum accuracy. I found this by running at 12 kph for one minute, two and three minutes. I found that there was not a great enough change in heart rate for one minute but at two minutes there was. ...read more.

Conclusion

* I will make sure I do not become dehydrated during exercise and I drink plenty of water to prevent this. Prediction: I predict that as exercise intensity increases heart rate will increase. I predict that the maximum heart rate I will be able to reach is roughly 215 bpm because the average safe heart rate is 220 bpm minus your age. I predict a graph similar to this with the results levelling off towards the higher intensities as maximum heart rate is reached. Factors that effect heart rate: 1) With increase in exercise there is an increase in the rate of respiration in the muscles so heart rate increases to supply the muscles with oxygen (which is carried in the blood) required for respiration and to remove the CO2. 2) Increased flow to the muscles and the skin is achieved by reduced blood flow other organs such as the intestines and kidneys. 3) Cardiac output is adjusted according to the demands of the body. Tom Keeling ...read more.

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