Daily News | Young, healthy adults are vulnerable to high heat and humidity, too, Penn State study finds
We recently spoke with W. Larry Kenney, professor of physiology and kinesiology at Penn State, and principal investigator on the project.We’ve been studying aging and heat stress — the effects of extreme environments and dehydration on older men and women — for the last 30-plus years.
The PSU H.E.A.T. Project — for Human Environmental Age Threshold — is different in that we are now addressing the question of “how hot is too hot?” What combinations of temperature and humidity are unsustainable for even young men and women and which ones put an extra burden on the elderly? For years, the climatology and meteorology community has theorized that the upper limit for human adaptability — the point at which the body can no longer dissipate enough heat and the core temperature begins to rise — was a “wet bulb temperature” of 95 degrees Fahrenheit. Wet bulb temperature is the air temperature at 100 percent humidity, which is more of a theoretical parameter. We have not seen a wet bulb temperature of 95 degrees anywhere on Earth, at least for a sustained period of time.
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