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Does Caffeine Affect Blood Pressure?

Does Caffeine Affect Blood Pressure? | Science Fair Projects | STEM Projects
In this experiment, we'll be testing the effects of caffeine on the blood pressure of 6th grade girls. We'll measure their blood pressure before and after drinking a can of Diet Pepsi to see if there is a difference.


The hypothesis is that when caffeine is consumed in large amounts it will increase the blood pressure.

Method & Materials

You will measure the blood pressure of 6th grade girls before and after drinking a can of Diet Pepsi, and then calculate the difference.
You will need a sphygmomanometer, 13 6th grade female students, 26 cans of Diet Pepsi, 13 straws, and a chart.


The results of the experiment varied from person to person, with no clear pattern. Some subjects showed an increase in blood pressure, but too many did not. This leads us to reject the hypothesis that caffeine increases blood pressure.

Why do this project?

This science project is interesting because it tests the effects of caffeine on the blood pressure of 6th grade girls, which is something that is not often studied.

Also Consider

Variations of this experiment could include testing the effects of caffeine on different age groups, or testing the effects of different types of caffeinated beverages.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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