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Comparing Resting and Exercising Blood Pressure of 7th Grade Students

Researched by Kierstin W. 
2003-04




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
Testing Room
1 Instruction script for experiment
1 stopwatch
1 Metronome
25  subjects


PROCEDURES

1. Gather Materials 
2. Obtain your subject volunteers 
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.


  
RESEARCH REPORT 

Introduction 
Health is one of the most important factors to living a long and healthy live. Your circulatory system is a significant part of your body that needs to be monitored carefully. The circulatory system is the part of your body that supplies cells with food and oxygen that they need in order to work properly. It also carries carbon dioxide and waste products away from the cells and it helps keep your body temperature regular. The circulatory system also carries a substance that helps fight off infections, diseases, and other foreign substances that may harm your body. 

Blood Pressure  
Blood pressure is a pressure that exerts against walls of arteries. One of the many tools that doctors and nurses use to measure patient’s blood pressure is a sphygmomanometer. The sphygmomanometer consists of a cuff of a wide rubber bulb, which can be filled with air, a hallow rubber bulb which pumps into the cuff, and a gauge or glass tube that contains a column of mercury. There are two types of blood pressures, systolic and diastolic. Systolic blood pressure represents the blood pressure when the heart is contracting. This blood pressure is determined by reading the gauge of scale on the mercury tube. The pressure at this point is called the diastolic blood pressure. Diastolic blood pressure represents the blood pressure while the heart is relaxing.  
The Circulatory System  
The circulatory system contains your heart, lungs, and the blood vessels that are working together to form the circle of the circulatory system. This system has three distinctive parts; the pulmonary circulation, coronary circulation, and the systemic circulation. The pulmonary circulation is your lung. In the coronary circulation is your heart, and the rest of your body is considered the systemic circulation. 

Heart Disease  
Heart disease has become one of the number one killer of the United States of America, and now technology has made life easier for the victims of heart disease. The rate of heart disease has increased tremendously from 1940 - 1967. When the heart disease rate increased, the World Health Organization (W.H.O.) called it the world’s most serious epidemic. Now, heart disease has become very common in the United States. Heart disease is caused by a rich and unhealthy diet, which leads to clogging up blood vessels, heart attacks, and even strokes.  
A thirty three year old study, which began in 1948,and was started in Framingham, Massachusetts. This study involved 5127 people that were aged from 30 to 62. All of these people had no sign of heart disease. During this study, the participants would have a complete physical examination. At the end of the experiment, they provided priceless profile information for predicting heart disease to people all around the world. 

Exercise 
Staying healthy and in shape is a good way to maintain a healthy heart and control your blood pressure. If you are under weight, under weight, or average you should still exercise to keep to keep your blood pressure down and staying healthy.

Gender does have an effect on people’s blood pressure. Males usually have a lower blood pressure than females from the time they are young adults to middle age. Then, the process seems to reverse and males have the higher blood pressure. 

Having an unhealthy heart can be a huge risk to you. Checking your blood pressure regularly is a good idea. You should also have your blood pressure checked regularly so you can help prevent high blood pressure in the future. 

Summary 
 Staying healthy, maintaining a good diet, and exercising are all important things to do in order to living a long and healthy life.  You will be much better off staying in shape and eating right than having heart trouble, high blood pressure, or being overweight and not being able to do as may activities as would be able to do.  
 


BIBLIOGRAPHY

“Blood Pressure,” World Book Encyclopedia (internet) Oct. 24, 2003

“Circulatory System,” http://sln.fi.edu/biosci/systems/circulation.html

“Heart Disease,” http://www.fi.edu/bbsci/history.html

“Heart Disease,” http://www.fi.edu/history/history.html November  20, 2003

“Pulsation,” World Book Encyclopedia/Dictionary (internet) October  17, 2003 

Sabatino, Dominic “Blood Pressure,” World Book Encyclopedia, 2002

“Stethoscope,” World Book Encyclopedia/Dictionary (internet) October 17, 2003


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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