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The good news: Not only will your body acclimate to the cooler weather, but you can also hurry this process along. Beginning in the 1960s, U.S. Army researchers found that nude men who spent eight hours a day in a 50°F (10°C) chamber became habituated to the cold and had mostly stopped shivering after two weeks.
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Fall is here, and the mercury is falling in thermostats across the northern hemisphere. The good news: Not only will your body acclimate to the cooler weather, but you can also hurry this process along. Beginning in the 1960s, U.S. Army researchers found that nude men who spent eight hours a day in a 50°F (10°C) chamber became habituated to the cold and had mostly stopped shivering after two weeks. Later research from Scandinavian and U.K. teams likewise concluded that people can get used to cool environments. And a recent research review from Army researchers concluded that all humans seem to have at least some ability to acclimatize to the cold. A small 2014 study published in the journal PLOS One, a group of healthy men spent up to three hours a day sitting in baths filled with 57°F (about 14°C) water. (That’s roughly the temperature of the Atlantic Ocean along the New Jersey and New York coastlines in late October, according to the National Oceanic and Atmospheric Administration.) At the start of the 20-day study, the men did a lot of shivering, which is the human body’s initial response to cold. Their heart rates and metabolisms sped up, generating heat. At the same time, their blood vessels narrowed and drew back from the surface of the skin, causing skin temperature to drop. Basically, the men’s vascular systems clenched—pulling blood toward their warmer interiors in an effort to escape the exterior cold. But by Day 20, much had changed. The men’s shivering had more or less stopped. While their metabolisms and heart rates still sped up in response to the cold-water bath, their blood vessels no longer constricted and their skin temperature didn’t drop the way it had before. The men reported less discomfort during their chilly baths. At the same time, their blood samples contained fewer markers of cold-induced stress and immune-system activity. It appeared their bodies had gotten used to the chill. Get our Health Newsletter. Sign up to receive the latest health and science news, plus answers to wellness questions and expert tips. Please enter a valid email address. * The request timed out and you did not successfully sign up. Please attempt to sign up again. Sign Up Now An unexpected error has occurred with your sign up. Please try again later. Check here if you would like to receive subscription offers and other promotions via email from TIME group companies. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Service and Privacy Policy Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.
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“Everyone has an ability, to some extent, to acclimatize to cold,” says Marius Brazaitis, first author of the study and a senior researcher at Lithuanian Sports University. He says the human body seems to achieve acclimatization through a mix of different internal adjustments, which people can either encourage or suppress depending on their behaviors. What sorts of internal adjustments? There’s evidence that a particular type of fatty tissue, known as “brown fat,” may help the body generate heat in response to persistently cold conditions. “Chronic cold exposure somehow activates brown fat, which we know undergoes dramatic seasonal changes,” says Shingo Kajimura, a professor in the Department of Cell and Tissue Biology at the University of California, San Francisco. Kajimura says newborns have a lot of brown fat, which helps them stay warm because they lack sufficient muscle to shiver. While it was once thought that people lost their stores of brown fat as they grew out of infancy, research has found that parts of the adult body—specifically, the area around the upper spine and neck—either retain brown fat or generate new brown-fat tissues in response to cold. The placement of this brown fat is important. Kajimura says that temperature perception is monitored by the brain, which detects the cold in part by noting the temperature of blood flowing into it through the neck. “That’s why putting a scarf on makes you feel warm,” he says. By warming the neck and the blood flowing through it, a scarf “tricks” the brain into believing it’s warm—just as a cold cloth on the neck can help the brain cool off in summer. It’s possible that, in response to regular cold exposure, brown fat in the neck area both forms and becomes more active, keeping us more comfortable at colder temperatures. Brazaitis says the human body seems to possess a number of different mechanisms that help it adjust to the cold. But most people in the developed world suppress these adaptive mechanisms, at least to an extent, by shielding their bodies from “thermal distress.” “Putting on more clothes, drinking more hot drinks, increasing room temperature, consuming more food, which increases inner metabolic rate—this behavior does not allow [the body] to become more resistant to cold,” he says. While they may impede the body’s ability to adjust to colder temps, pulling on a sweater or sipping some hot tea does little long-term harm. But cranking up the thermostat in your car or home costs money. Home and vehicle heating is also a major contributor to greenhouse gas emissions, according to the U.S. Environmental Protection Agency. By encouraging your body to adapt to the cold, you can feel comfortable during the fall and winter without needing to entirely rely on heating system. Adjusting your thermostat down by a few degrees, shedding layers, and spending more time outside in cold conditions—basically, anything that causes you to shiver—will help your body acclimate to the cold, Brazaitis says. If you can induce shivering a few times a day, you’ll begin to feel more comfortable in colder temps after just one week, he says.
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