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Effect of exercise on the heart rate

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Introduction

GCSE Coursework - Effect of exercise on the heart rate Introduction For it's size the heart has the huge capacity of pumping large amounts of blood, in the average adult's heart beats 60 to 100 times a minute, pumps between 70ml and 100ml of blood with each beat, circulates 5 to 6 litres of blood around the body per minute and about 13 litres of blood per minute during vigorous exercise. The heart will beat more then 2.5 billion times during an average lifetime. This investigation will be looking at the effect of exercise on the heart rate. Aim The aim of this investigation is to find out how exercise affects the heart rate, using research & experimenting on changes and increases in the heart rate using exercise. Research ? The heart The normal heart is a strong, hardworking pump made of muscle tissue. It is about the size of a person's fist. The heart has four chambers. The upper two chambers are the right artium and left atrium, and the lower two are the right ventricle and left ventricle. Blood is pumped through the chambers, aided by four heart valves. The valves open and close to let the blood flow in only one direction. The four heart valves are: 1. ...read more.

Middle

Exercise helps your heart by: * strengthening the heart muscle * making the heart more efficient * improving the flow of blood to the heart muscle and * improving the heart's ability to handle stress When we exercise our heart rate increases. This is because our muscles are working harder and need more energy. Our heart rate increases to supply more oxygen, carried in the blood, to these muscles. The oxygen is needed in the muscles for aerobic respiration, that is to break down glucose, which we get from food, into glycogen which is the main type of energy we use when we exercise. Method The experiment will be carried out by measuring the heart rate before and after exercise on a number of people. The experiment procedure will go as follows: ? I will measure the resting rate of the group before any physical exercise & record the results. ? I will then begin the group exercising, the exercise will last for five minutes with 30 second breaks every 1 minute, this is so I can measure the heart rates of the group every 30 seconds and record it. ? When the exercise if completed I will measure the heart rate levels of the group once every minute until it returns to its original heart rate. ...read more.

Conclusion

The lowest BPM were at the resting stage in the beginning and the resting stage at the end of the experiment. The highest number of BPM was at the 5 minute mark into the exercise and the lowest number of BPM was at the 5 minute mark after finishing exercising. Persons 1 and 2's hearts seemed to be nearly on par whereas person 3 seemed to have a higher heart rate then the first two, maybe this is because the 3rd person smokes and is slightly more overweight then the first 2. I believe re-doing the experiment a number of times would enhance the ultimate accuracy of this investigation but I believe the results seem to be accurate enough and correct as well as supporting my predictions. Evaluation I believe my experiment went well, I listed the results accurately, timed the experiment accurately and made sure the group all exercised for the accurate amount of times and a similar pace. The ways in which I could of improved my investigation was perhaps, using a larger group, doing the experiment more then twice to make sure my results are as accurate as I can possibly get them and to use people of the same fitness, height, weight & people that do not smoke. ...read more.

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