When the air turns crisp, our bodies start working harder than we realize. Scientists studying cold stress explain that even small drops in temperature can change how blood flows, how much energy we burn, and even how our moods shift. For families, that makes winter play both fun and a lesson in safety—helping kids learn how to stay warm, recognize their body’s signals, and build resilience in the cold.
Enter Dr. Gordon Giesbrecht a.k.a. Professor Popsicle. Giesbrecht, the environmental physiologist and director of the University of Manitoba's Laboratory for Exercise and Environmental Medicine, is a self-proclaimed cold hater. Strong words, but the professor has made it his life's work to understand "cold".
As Outside Magazine notes, "Giesbrecht didn't become the world's leading authority on hypothermia by sitting around the campfire. He got there by leaping into frozen lakes, injecting ice water into his veins, and taking lots of very, very cold baths."
He has conducted hundreds of cold-water immersion studies and has even lowered his body temperature below 95 degrees, the threshold for hypothermia. All of this has provided valuable information about cold stress physiology and pre-hospital care for human hypothermia.
He claims there is a psychology of cold. Think about how cold you feel on the first chilly day after summer. Now think about the same temp in the beginning of spring. Even though the temperatures are similar, Giesbrecht opines that we feel it differently.
"We acclimatize not only throughout the season, like weeks and months, but also hours and days", says Giesbrecht. He also talks about our attitude towards cold. If you are sure you will be cold, you probably will be. A great way to combat that is to think of the positive aspects of what you are doing out in the cold. And, of course, wearing warm clothing is critical.
Giesbrecht claims that it is actually pretty hard to induce hypothermia. First, watch out for shivering. Shivering for a minute or two will warm you up. If you continue to shiver for 15 minutes or more, it is most likely a sign you need to get indoors and take time to warm up.
Frostbite is another thing to be aware of. Knowing when it is setting in can be tricky. "Never accept numbness," Giesbrecht advises. If anything feels numb you need to get warmed now.
Cold cues are worth paying attention to. Shivering is the body’s natural heater, while numb fingers or toes are a clear sign to warm up. Teaching kids to recognize these signals—and pairing them with warm layers, hot drinks, and a positive outlook—makes winter safer and more enjoyable. By blending science with everyday routines, families can embrace the season not just as a challenge, but as a chance to understand how strong and adaptable our bodies really are.
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