This occurs when the muscles are working hard (during exercise) and so the lungs and bloodstream cannot deliver enough oxygen, to respire the available glucose. Therefore the glucose can be only broken down bit by bit, which releases a small amount of energy and produces lactic acid as a waste product and this can only operate a short time. The producing of lactic acid during vigorous exercise can cause a cramp (this is a signal to slow down, a cramp (muscle fatigue) occurs when too much lactic acid collects in the muscles
And this causes oxygen debt. The oxygen debt must be repaid by continued breathing after exercise in order to provide enough oxygen to oxidise the lactic acid to carbon dioxide and water and also this returns the pulse rate back to normal.
Plan
We are tying to find out the effect exercise has on our pulse rate. To find this out we have chosen to do the skipping exercise. We will carry out three tests.
We will not alter the exercise each time but we will vary the time. The 1st test is skipping for 30 seconds, the 2nd for 60 seconds and the 3rd for 90 seconds
We will keep the person same because we all have to do our own anyway and we will keep the exercise the same which is skipping.
I will measure the pulse and here is a diagram of where and how I will measure the pulse.
- Find pulse site on the wrist
- Press lightly but firmly with you index and middle finger.
- Begin counting for 30 seconds and whatever pulse rate you got, double it and that is your pulse rate per minute.
We will do the test like this
- Skip for 30 seconds, take pulse for 30 seconds and wait until pulse returns to normal. Keep on recording pulse rate every 30 seconds
- Skip for 60 seconds, take pulse for 30 seconds and wait until pulse returns to normal. Keep on recording pulse rate every 30 seconds
- Skip for 90 seconds, take pulse for 30 seconds and wait until pulse returns to normal. Keep on recording pulse rate every 30 seconds
Aim:
We were trying to find out if exercise has an affect on our pulse rate.
Method:
We never made any changes to our experiment. We were thinking of doing the experiment twice to get a better result, but we ran out of time. We thought that we can do this experiment at home because we don’t have to use equipment which is hard to get, it is only a skipping experiment and so I repeated the experiment again and I got similar results to the one I did at school. We also found the averages of both trials. First I was going to do a normal skip but then that won’t show good results so I did fast skipping.
Results:
Table to show the pulse rate after exercise
Tables to show time taken for pulse to go normal
1st trial: average pulse=68
2nd trial average pulse=65
Table to show average time for both trials
Conclusion and evaluation
My results are accurate and reliable so I can draw to a conclusion. I have learnt that the faster and vigorously you do exercise the more your pulse rate increases and the more time it takes to return back to normal. I did not have and unusual or any unexpected results
If I had more time then I would have done I slow exercise and then I would have compared the result. If I did this experiment again I would have changed the exercise or do a slow exercise and I would have compared my results with the fast one also I could have compared my results with the person I worked with so we can see if our pulse rates are different. I also would have change it by asking people to do it who are of a different age and people who have a different level of fitness. If I could do I would have done it at different time of the day e.g. morning, before eating and after eating. I would have done some research toward this investigation about breathing and how our pulse rate increases and the heart. I never had any problems but the skipping rope at school was too small and so it was harder to skip with, I overcame with the problem and I held the skipping rope at the edges and this made it easier then before. Our experiment was very successful and I think we carried out a good and fair trial.
