2 Free Issues and 3 Free Gifts!
Full Name:
Address 1:
Address 2:
Zip Code:
Email: (required)
If I like it and decide to continue, I'll pay just $12.00, and receive a full one-year subscription (9 issues in all), a 73% savings off the newsstand price! If for any reason I decide not to continue, I'll write "cancel" on the invoice and owe nothing.
Your subscription includes 3 FREE downloadable booklets.
Or click here to pay now and get 2 extra issues
Offer valid in US only.

Also on

Enter Zip Code

Backpacker Magazine – December 1999

Winter Harm: Cold Dangers

Cold can harm in subtle and quick ways, so it pays to be prepared.

by: Rosemerry Trommer

PAGE 1 2


Moving air or water snatches the heat from your skin even faster than radiation or conduction. "Wind kills," says Hamlet. "It removes the layers of the still-warm air in our clothes and whisks away body heat fast."

Convection beater: Your cozy fleece jacket and pants won't keep you warm without a windproof layer over them. Even wearing the windproof layer alone will warm you considerably when a breeze kicks up. Also, protect your face and eyes from chapping and windburn with petroleum jelly or a thin layer of diaper rash ointment (zinc oxide), and goggles or wraparound glasses. If the wind is really bad, "find shelter," Hamlet says.


Even sweating and breathing cause moisture loss through evaporation, which can lead to dehydration any time of year. The risk is particularly high in winter, though, because people aren't as aware of their fluid needs during cold weather. When you don't drink enough, your blood thickens and there isn't as much moving through your body to keep you warm. Consequently, dehydrated people are more susceptible to cold-injuries, says Howard Donner, MD, a family sports and emergency medicine doctor in Telluride, Colorado, and coauthor of Field Guide to Wilderness Medicine (1998; Mosby-Year Book Inc., 800-426-4545; $34.95). "In an attempt to maintain normal blood pressure for vital organs, your body clamps down on peripheral blood vessels," which results in cold fingers, toes, ears, and nose. In extreme conditions, it contributes to hypothermia and even frostbite.

Evaporation beater: Drink plenty. "It really doesn't make a difference what you drink," Donner says. "You hear you should never drink coffee or tea because they're diuretics. That's overstated; it's just that the return is lower," so you have to drink that much more. An insulated bottle of warm water or a hot sports drink is better. Curtis recommends drinking 16 ounces of liquid before hiking, then 10 to 12 ounces every 30 minutes during activity.

Furnace Stoking

Once you've chinked all the cracks that let body heat escape, you'll still need to keep the furnace stoked. Here's where it pays to be fit, but not necessarily thin. "Muscle is where metabolic heat is produced," Donner says. "The more muscle you've got, the more heat you can make." Spend too much time sitting around not using those muscles, and the body compensates with chattering teeth and shivering. "The metabolic heat energy produced by shivering is huge, almost like jogging, but it's an inefficient use of energy. Most people can't shiver for more than 2 hours because their muscles run out of fuel."

Heat generator: "If you start to chill, increase your activity level," recommends Curtis. "The best thing to do is jump around, which uses your body's biggest muscles." Jumping jacks, jogging in place, anything that engages the big thigh and butt muscles is great. Just don't overdo it and work up a sweat. Keeping your body well supplied with heat-generating food calories is also a big part of staying warm in the winter.

PAGE 1 2

Subscribe to Backpacker magazine
Sign up for our free weekly e-newsletter
Address 1:
Address 2:
Email (req):
Reader Rating: -


Your rating:
Your Name:


My Profile Join Now

Most recent threads

Rocky Mountains
New Snow In Northwest Wyoming
Posted On: Jul 13, 2014
Submitted By: swimswithtrout
Trailhead Register
It's HAP.., er, no, oh wait, YES,..
Posted On: Jul 13, 2014
Submitted By: Starbreaker

View all Gear
Find a retailer

Special sections - Expert handbooks for key trails, techniques and gear

Check out Montana in Warren Miller's Ticket to Ride
Warren Miller athletes charge hard and reflect on Big Sky country, their love for this space and the immense energy allotted to the people who reside in Montana.

Boost Your Apps
Add powerful tools and exclusive maps to your BACKPACKER apps through our partnership with Trimble Outdoors.

Carry the Best Maps
With BACKPACKER PRO Maps, get life-list destinations and local trips on adventure-ready waterproof myTopo paper.

FREE Rocky Mountain Trip Planner
Sign up for a free Rocky Mountain National Park trip planning kit from our sister site

Get 2 FREE Trial Issues and 3 FREE GIFTS
Survival Skills 101 • Eat Better
The Best Trails in America
YES! Please send me my FREE trial issues of Backpacker
and my 3 FREE downloadable booklets.
Full Name:
Address 1:
Zip Code:
Address 2:
Email (required):
Free trial offer valid for US subscribers only. Canadian subscriptions | International subscriptions