08/03/2024
Gregorytem
Inside a heat chamber
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kreycik had almost everything on his side when he went running on that hot day: he was extremely fit, relatively young and was an experienced runner.
while some people are more vulnerable to heat than others, including the very old and young, no one is immune — not even the world’s top athletes. many are expressing anxiety as temperatures are forecast to soar past 95 degrees this week in paris, as the olympic games get underway.
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scientists are still trying to unravel the many ways heat attacks the body. one way they do this is with environmental chambers: rooms where they can test human response to a huge range of temperature and humidity.
cnn visited one such chamber at the university of south wales in the uk to experience how heat kills, but in a safe and controlled environment.
“we’ll warm you up and things will slowly start to unravel,” warned damian bailey, a physiology and biochemistry professor at the university. bailey uses a plethora of instruments to track vital signs — heart rate, brain blood flow and skin temperature — while subjects are at rest or doing light exercise on a bike.
the room starts at a comfortable 73 degrees fahrenheit but ramps up to 104. then scientists hit their subjects with extreme humidity, shooting from a dry 20% to an oppressive 85%.
“that’s the killer,” bailey said, “it’s the humidity you cannot acclimatize to.”
and that’s when things get tough.