1 ：みつを ★：2020/01/15(水) 21:39:39 ID:KO9nYsrX9.net
‘Normal’ Human Body Temperature Has Changed in the Last Century
BY ALICE PARK
JANUARY 14, 2020
Whether you have a stomachache, a wrist sprain or a chronic disease, one of the first things doctors and nurses will do at an appointment is take your temperature. A normal temperature means your body is humming along the way it should. A higher temperature means you have a fever, and shows your body could be fighting an infection.
And since 1871, “normal” has meant 98.6°F (37°C). That number was determined by a German physician, based on millions of readings from 25,000 German patients, taken by sticking thermometers under their arms. When doctors in the U.S. and Europe repeated the experiment in local populations, they came up with the same number, so it stuck.
But in a paper published last week in eLife, researchers at Stanford University reported that the normal human body temperature has dropped since that time. And that means the standards that doctors have been using to define normal temperature and fever might need to be reworked.
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