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Investigating the effect of exercise on the heart rate and recovery time.

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Introduction

Investigating the effect of exercise on the heart rate and recovery time. There are different factors that affect the heart rate, they are the variables.... I have decided to go for distance run for our variable. I decided that the variables such as fitness and individual involved would be too hard to measure fairly. METHOD As I decided to use distance run as my variable and I am going to use Mark as my 'Guinea Pig', so I am going to make Mark run 20 meters, 40 meters, 60 meters, 80 meters and 100 meters. I am going to change the distance run 5 times. I am going to record his resting heart rate, his heart rate straight after exercise and time how long it takes for him to recover. To make sure that my results are reliable and correct. I am going to take the average of these two sets of results and use the average for my graph and my final result. For this experiment I am going to use... * A heart rate monitor, to measure Marks heart rate - this consists of a belt and a transmitter belt. The belt is moistened so it can read the heart rate easier, then it is placed around the chest. ...read more.

Middle

The body also produces chemical hormones, such as adrenaline, which can change the heart rate. When we are excited, scared, or anxious our heart gets a signal to beat faster. During a fever, the heart beats faster to bring more blood to the surface of the body to release heat and cool the body. The heart rate increases during and after a meal to send more blood to the digestive system. A trained athlete's heart can pump more blood with each beat so his or her heart rate is slower. Likewise, an athlete's recovery time is shorter.'' But when Mark has stopped working his heart rate will still be high because he will need to pay back the oxygen debt. This is because at some points when he is exercising he will respire without oxygen; this is called anaerobic respiration, because he may not take in enough oxygen for aerobic respiration. So when Mark has stopped working he has to ''pay back'' his oxygen debt in order to break down the lactic acid, which is the incomplete break down of glucose. Lactic acid causes cramp in the muscles. The word equation for this reaction is... GLUCOSE ENERGY + LACTIC ACID The further he runs the longer it will take for his heart rate to return to normal because he would have had to work for longer so his oxygen debt would be greater. ...read more.

Conclusion

Lactic acid causes cramp in the muscles. The word equation for this reaction is... GLUCOSE ENERGY + LACTIC ACID The further you run the longer it will take for your heart rate to return to normal because you will have had to work for longer so your oxygen debt would be greater. EVALUATION I used mark as my 'guinea pig' and I made him run different distances 20, 40, 60, 80 and 100 meters) changing the distance 5 times. I recorded his heart rate straight after exercise and resting heart rate, so I knew when his heart rate had returned to normal, and how long it took him to recovery took the average of 2 sets of results. To make sure my results were accurate I used a heart rate monitor instead of finding out the heart rate manually. I used a stopwatch to record the recovery time and a tape measure to record the distance. On each graph there was one odd result this may have been a wrong recording or a fluke. I think that the experiment was a success and the results were reliable but to improve the final results we could take a few more results and get a more accurate average result. I think the results that I collected are sufficient to support a firm conclusion. To extend the enquiry I could experiment how different types of exercise effects the heart rate. Harriet collett ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This investigation into the effect of changing the running distance on heart rate and recovery time is a competent piece of GCSE work which reflects a good understanding of basic exercise physiology. The writer presents a clear account of the theory, method and results.

It could certainly have been improved in the following ways:

[1] Use of standard scientific terminology when discussing variables (independent, dependent, controlled);

[2] A more detailed discussion of controlled variables including some indication of how the subject would rest between trials;

[3] A more detailed analysis of the data with references to specific results to support the conclusions made.

Overall, 3 stars.

Marked by teacher Ross Robertson 24/04/2013

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