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## Comparing Resting and Exercising Blood Pressure of 7th Grade Students

PURPOSE

The purpose of this experiment was to determine the difference between exercising and the resting blood pressures of young teenagers.

I became interested in this idea during my baseball practice when I wondered if our blood pressure was higher or lower when we were playing rather than resting.  I knew exercise increased pulse rate, but what about blood pressure?

The information gained from this experiment  could be helpful to coaches, doctors or medical employees to better identify the effect that exercise has on a young teenager’s blood pressure.

HYPOTHESIS

My hypothesis was that the blood pressure would be lower while resting than when doing exercise.

I based my hypothesis on an article that I studied in the World Book Encyclopedia that proves that blood pressure is higher while exercising that while resting.

EXPERIMENT DESIGN

The constants in this study were:
* The subjects used in the resting and exercising experiment.
* The approximate age of the subjects.
* The time spent exercising and resting.
* The amount of times blood pressures were taken.
* They type of instrument used to take and measure blood pressure.
* The room the experiment took place.
* The metronome time set (108 beats per minute)

The manipulated variables in this experiment was the gender of the subjects.

To measure the responding variable I used a Portable Wrist Blood Pressure Monitor that was placed on the wrist and recorded the blood pressure in millimeters of mercury.

MATERIALS

 QUANTITY ITEM DESCRIPTION 1 Portable Wrist Blood Pressure Monitor 1 Testing Room 1 Instruction script for experiment 1 stopwatch 1 Metronome 25 subjects

PROCEDURES

1. Gather Materials
3. Have your subjects come in one at a time to the experiment location.
4. Take the subjects blood pressure before exercising.
5. Next have the subject exercise for two minutes stepping to the beat of 108 of a metronome, then take their blood pressure immediately  after.
6. Then have them continue along with the exercise for two more minutes, and take their blood pressure again right after they finish.
7. Once you have taken their second blood pressure, have
8. the subject rest by sitting down for four minutes.
9. After they have rested, take their blood pressure again.
10. Have the subject rest for another four minutes, and then take their blood pressure again.
11. After the subject’s testing is all done, send back to class.
12. Continue with steps 1-10 with each of the rest of the subjects until all subjects have been tested.

RESULTS

The original purpose of this experiment was to determine the difference between exercising and the resting blood pressures of young teenagers.

The results of the experiment were that the student’s blood pressure increased after two minutes and four minutes after exercising, but their blood pressure was higher after they rested for eight minutes than it was before they exercised at all.

See the table and graphs below.

Conclusion

My hypothesis was that blood pressure would be lower while resting then after doing exercise.

The results indicate that this hypothesis should be accepted.

Because of the results of this experiment, I wonder if I tested boys vs. girls to see which of the two genders has a higher pulse rate if they exercise for a longer period of time, and then rest for a shorter amount of time.

If I were to conduct this project again I would have the subjects exercise for a shorter amount of time, and then have them rest, and then exercise again after they rest.

ACKNOWLEDGEMENTS

I would like to thank the following people for helping make my project possible:
* The teachers who let me use their students during class time
* My family for all of their support, and help in getting me through this.
* Mrs. Helms and the volunteers for supervising my experiment
* My subjects for making this experiment possible
* My teacher for helping me obtain subjects, reviewing my work.

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