After a long, stressful day, many people like to spend some time in a hot tub, as a way of mellowing out. Robert Sagarian’s project examined the effect of spending 15 minutes in a hot tub.
Hypothesis
I believe that after spending time in a hot tub, blood pressure will lower as a result of vasodilatation (the increase in the internal diameter of blood vessels).
Controls
All tests done in the same hot tub over period of three days
Materials
- 15 subjects ages 18 to 72
- Sphygmomanometer, an instrument used to measure blood pressure in millimeters
Procedures
Over a period of three days, test each subject as follows:
- Take and record systolic and diastolic blood pressure.
- Have subject spend 15 minutes in the hot tub.
- Take and record systolic and diastolic blood pressure again.
Results
There was an average 5 percent decrease in both types of blood pressure after 15 minutes in the hot tub.
Conclusions
My hypothesis was that after spending time in a hot tub, blood pressure would lower as a result of vasodilatation. Because both types of blood pressure averaged a 5 percent decrease after 15 minutes in the hot tub, this project shows that some time in the hot tub is a good way to wind down after a particularly hectic work or school day.
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