What Is PSI?

• Developed by the military to evaluate soldiers in the field

• Based on Changes in Body Temperature and Heart Rate

• Rates condition on a scale of 0 to 10

• Field Tested with “THE PILL”

• Simple to measure and calculate.

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Notes:

PSI looks at the changes that have occurred to the person as they work in a environment. The system rates a person’s strain level based on how far they have progressed from their starting Temperature and Heart Rate to the maximum values of 180 beats per minute and 101.5 degrees ºF.