They then sat in an environmental chamber, moving just enough to simulate the minimal activities of daily living, such as cooking and eating. Patrick Mansell / Penn State, CC BY-NC-NDĮach participant swallowed a small telemetry pill, which monitored their deep body or core temperature.
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Tony Wolf, a postdoctoral researcher in kinesiology at Penn State and co-author of this article, conducts a heat test in the Noll Laboratory as part of the PSU Human Environmental Age Thresholds project. These experiments provide insight into which combinations of temperature and humidity begin to become harmful for even the healthiest humans. To answer the question of “how hot is too hot?” we brought young, healthy men and women into the Noll Laboratory at Penn State University to experience heat stress in a controlled environment. The results of these tests show an even greater cause for concern. It was not until recently that this limit was tested on humans in laboratory settings. People often point to a study published in 2010 that estimated that a wet-bulb temperature of 35 C – equal to 95 F at 100% humidity, or 115 F at 50% humidity – would be the upper limit of safety, beyond which the human body can no longer cool itself by evaporating sweat from the surface of the body to maintain a stable body core temperature. Scientists and other observers have become alarmed about the increasing frequency of extreme heat paired with high humidity, measured as “wet-bulb temperature.” During the heat waves that overtook South Asia in May and June 2022, Jacobabad, Pakistan, recorded a maximum wet-bulb temperature of 33.6 C (92.5 F) and Delhi topped that – close to the theorized upper limit of human adaptability to humid heat.
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Our research shows the combination of the two can get dangerous faster than scientists previously believed. The answer goes beyond the temperature you see on the thermometer.
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One question a lot of people are asking is: “When will it get too hot for normal daily activity as we know it, even for young, healthy adults?” Heat waves are becoming supercharged as the climate changes – lasting longer, becoming more frequent and getting just plain hotter.