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Effects of exercise on cardiovascular system

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Introduction

COURSEWORK ASSIGNMENT 3 Draft 3 Effects of exercise on cardiovascular system Aim: In this experiment I am going to investigate the effects of exercise on cardiovascular system of healthy individuals by measuring and comparing the changes in heart rate during and immediately after exercise. Introduction: I predict that during exercise the heart rate will increase rapidly depending on the intensity of exercise and the resting rate will be restored soon after exercise has stopped. I believe that these changes are caused by the increased need for oxygen and energy in muscles as they have to contract faster during exercise. When the exercise is finished the heart rate will gradually decrease back to the resting pulse rate as the muscles' need for oxygen and energy will be smaller than during exercise. Apparatus: � time-measuring equipment (stopwatch) � exercise equipment (stepper) � calculator � pen/pencil and paper Plan: Four healthy subjects, two males and two females, age range 25 - 35, non-smokers with no history of lung or heart related problems are going to carry out exercise on stepper for the duration of 10 minutes. For the health and safety reasons the gym equipment is checked for any faults and damages before use and the subjects are wearing trainers to avoid injury. To make sure that my experiment is the fair test I have to keep some variables, such as temperature of the ...read more.

Middle

15 sec 1 min A 0 37 148 1 36 144 2 34 136 3 34 136 4 35 140 5 31 124 6 29 116 7 30 120 8 27 108 9 25 100 10 25 100 11 24 96 12 22 88 13 20 80 14 21 84 15 19 76 B 0 35 140 1 33 133 2 26 104 3 24 96 4 23 92 5 26 104 6 22 88 7 21 84 8 23 92 9 21 84 10 23 92 11 18 72 12 18 72 13 19 76 14 18 72 15 19 76 Subject Minutes after exercise Heart rate (beats) 15 sec 1 min C 0 30 120 1 30 120 2 29 116 3 28 112 4 29 116 5 26 104 6 25 100 7 24 96 8 24 96 9 23 92 10 21 84 11 22 88 12 20 80 13 19 76 14 18 72 15 18 72 D 0 30 120 1 29 116 2 28 112 3 27 108 4 27 108 5 26 104 6 25 100 7 24 96 8 24 96 9 25 100 10 22 88 11 21 84 12 20 80 13 18 72 14 17 68 15 16 64 Analysis: In table 1 we can see heart rate before exercising. ...read more.

Conclusion

The use of specialised equipment, such as a heart rate monitor would produce more accurate results and remove the need for manual counting of the heart pulse. I cannot be sure that the exercise on the stepper was of high intensity and remained constant throughout the experiment as these variables could not be measured on the equipment used. The use of more developed equipment with the monitor showing the level and intensity of exercise would be more appropriate to gain the accurate results as this would help the subject to keep the constant pace throughout exercise. The results are limited in validity as the only apply to healthy persons of small age range. To improve the experiment the bigger number of people of different age and lifestyle should be used as the more results are obtained the more accurate they will be. Experiment was done only once which each subject which may have brought incorrect results. My results support my initial prediction although more investigation and repeated experiments are needed to confirm the results and to provide valid statistical data. Conclusion: Overall, the results shown above confirm the initial prediction that the heart rate increase during exercise and return to normal level shortly after exercise has been completed. Heart rate increased during the high intensity exercise to feed body's need for more oxygen and energy and have been decreasing gradually immediately after exercise has finished as the muscles did not need more energy than usually. ...read more.

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