How Does Exercise Affect The Pulse Rate?

Planning:


Aim: How does exercise affect the pulse rate?

Hypothesis: I think that exercising does affect your pulse rate and will increase the amount pumps (the bumps you feel) because when you exercise your body has to pumps more blood. This is because when you exercise, the cells that are in your muscles need more energy to move. Your muscles get this energy from respiration. This chemical reaction uses up oxygen to release energy from glucose. This travels in the blood so if your muscles need more oxygen and glucose, they get it from the blood. So now we know that when you exercise, your body pumps more blood, which makes your pulse rate faster. Also when you have did a lot of exercise you can feel your pulse rate in your neck beating really fast. I think that my pulse rate will take about four/five/six minutes for it to return back to normal.

Materials:
- Stop watch (to keep track of how long you are exercising)
- Your method so you know what to do for the experiment.
- A pen and piece of paper so you can write down the results that you get.

Planning:
Make sure that all the experiments you do on measuring your pulse rate are fair (don’t eat before the experiment or do not do exercise). I will write down variables which should be included in this experiment:
1. The time in which you do the experiment should be kept the same (unless you are testing your pulse rate in a different way).
2. Change the number of exercises you do.
3. Do the same type of exercise each time (for example star jumps!)
4. Wait until your pulse rate returns to normal before doing the exercise again.
5. Do the experiment in the morning when you wake up. This is a whole lot easier then doing it in the afternoon because if you want to do this experiment twice you have to eat and rest the same amount which you did the day before.

Method:
Wake up in the morning about 25 minutes earlier then you usually do and measure your pulse rate for one minute. Then do 10 jumping jacks (1 per 6 sec.) in 1 min. After, measure you pulse rate every minute until it returns to normal and then write down how long it took. Repeat what you just did again the day after. See if your pulse rate is similar to the first test you did and if it is not, try the experiment again the day after because you have obviously not made it a fair test. I will repeat this experiment to make it more accurate. This is because when I repeat my experiment I can then average my results to make them more accurate! I will do my first experiment on Sunday and my second experiment on Monday. And if it is necessarily I will do the experiment again on Tuesday.

Results:
This chart shows how high my pulse rate is after and before exercising and how long it takes for my pulse rate to go back to the usual beat.

SUNDAY:
Normal breathing: 72
After one minute of exercising: 89
After two minute of exercising: 82
After three minutes of exercising: 78
After four minutes of exercising: 72-73

MONDAY:
Normal breathing: 68
After one minute of exercising: 80
After two minutes of exercising: 75
After three minutes of exercising: 69
After four minutes of exercising: 68

Conclusion:
My results show me that my hypothesis is correct. I estimated that my pulse rate would take about four to five or six minutes to return back to normal. In both experiments my pulse rate took four minutes to get back to normal. Your pulse rate does increase after exercising because when you exercise your body has to pumps more blood. As I already explained in my hypothesis, the heart has to pump more blood because when you exercise, the cells that are in your muscles need more energy to move. Your muscles get this energy from respiration. This chemical reaction uses up oxygen to release energy from glucose. This travels in the blood so if your muscles need more oxygen and glucose, they get it from the blood. A good supply is very important for muscles!

Evaluation:
I think this experiment was a success because I did research on the internet and the science book has also been a great help to me. I am satisfied with the results I have gotten and about the lab I have written up. If there is anything that I would do to improve this or lab is the method. Instead of doing one star jump every six seconds, next time I might do three star jumps every six seconds. I might also want to choose another exercise instead of star jumps but running around a (empty) room every 6 seconds. Next time I would also like another person to time me instead of myself because I find it difficult doing star jumps, counting the star jumps and watching the stopwatch at the same time.

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