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# How Exercise Affects Your Heart Rate and Recovery Time

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Introduction

BIOLOGY COURSEWORK HOW EXERCISE AFFECTS YOUR HEART RATE AND RECOVERY TIME PLAN I plan to investigate the effect of different amounts of exercise on heart rate and recovery time. I will record the amount of time it will take for my heart rate to return to normal after doing 10, 20, 30, 40, 50 and 60 step ups per minute for one minute on to the rung of a lab stool. In the interest of safety, I will not do more than 60 steps per minute in case I slip, fall and hurt myself. Also I may not be able to keep up with more than 60 per minute. I will make sure that the stool is on an even surface and will not jog while I am stepping up. I will wear sensible shoes and clothes. I will begin by sitting very still for 5 minutes so that my pulse rate is as low as possible. Then I will take my pulse rate for over a period of one minute, I will repeat this until I have four steady pulse rates. This is to insure that my pulse rate is not still slowing down. The sudden increase in pulse rate may be due to movement or talking, this is because the muscles will begin to work and need the blood pumped faster to give them more oxygen and food. ...read more.

Middle

Hypothesis: predict that if you increase the amount of exercise by two, your heart rate will increase by a factor of 1.3. Reason: I have come to this conclusion after looking at the relationships between different amounts of exercise and the heart rate after them. Scientifically, the higher heart rate is due to the heart pumping faster to get more oxygenated blood to the muscles, which need it to work faster. I will take secondary data from a classmate so that I can compare the two. I will perform the step-ups twice and then also find the averages so that the over all results are more accurate. OBTAINING EVIDENCE Results: This set of results was taken in school time: The following results where all taken at home on 28/03/01 at 7:23pm. My resting pulse rates where: 62 59 60 61. Here is a table of results of averages of the two sets of results: Here is a set of my classmate Joanne Lerpiniere's reults taken at school: Here is second set of results taken at home on 03/04/01 at 5:00pm.her reting pulse rates were: 62 61 63 64. Here is a table of averages: ANALYSIS AND CONCLUSION My first set of results do not really confirm my prediction.when I increased the amount of exercise by two the first time, the recovery time was quicker and quicker still when I increased it by two again. ...read more.

Conclusion

But it does show how much our pulse rate can be affected by our health and surrounding over 14 days. Any of the results could have also been afected by coughing, talking, laughing etc. or if something happened by supprise, such as a test tube falling and smashing on the ground near by. This is because our body would have sensed a sudden change in the enviroment and possible danger so the heart would start to beat faster to prepear the body for action. My conclution is that an increase in exercise does increase the pulse rate but it veries person to person depend ing on how much regular exercise they do and how energetic and active they are as a person. They more exercise they have done the quiker the pulse should return to normal and the lower it should stay when doing exercise.surroundings also affect your pulse rate, the more distraction, the harder it is to follow a steady pattern. EVALUATION I think that I planed out my experiment quite well and I interpreted the information well to give an accurate conclution. The second set of my results was very helpful becauseit showed the calmer surroundings give more accurate results and also I was able to make a table of averages. Comparing my results with Joanne's also helped helped to show how pulse rate between two people with different life styles compare to each other. It also clarified why some of my results appeared to be very innacurate. ...read more.

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This is a very superficial experiment write up, which doesn't use scientific theory to explain or reinforce the results. The analysis and evaluation is basic and gives no thought on how the experiment could be improved.
2 stars.

Marked by teacher Louise Star 09/07/2013

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