We Canadians pride ourselves on our ability to cope with our severe winters. But we forget that the cold can and does kill. The dangers become all too clear when there is a disaster like last winter's ice storm in Eastern Canada, and when unprepared people become stranded or fall into cold water.
Hypothermia, sometimes called exposure, occurs when the body can no longer produce more heat than it is losing. The body's internal temperature then drops below 35 C or
95 ºF.
It's important for Canadians to know what leads to hypothermia. Wind, wet and cold are the key factors. Wind can chill the body as air moves over it. Water rapidly absorbs body heat; wet clothing is a common cause of hypothermia, and casualties in lakes and rivers are often due to hypothermia, not drowning. Cold air cools down the body - but it does not have to be frigid; hypothermia can happen at under 10 C, so it's a threat even with above-average winter temperatures.
Precautions Anyone can Take
The Canadian and US Safety Council recommend preparing yourself against hypothermia if you are working outside or taking part in outdoor recreational activities:
•    Wear a warm hat. Most body heat is lost through the head.
•    Wear layered clothing. Proper layers will allow warm air to stay trapped but do not trap perspiration next to the skin.
•    Protect your feet and hands. Wear loose waterproof boots. If the boots have felt liners, carry an extra pair to replace damp ones. Mittens warm the hands more effectively than gloves. Carry an extra pair of these too.
•    Prevent dehydration and exhaustion, which can lead to hypothermia. Drink plenty of non-alcoholic fluids. Pace yourself when doing vigorous activity.
•    Stay fit through good physical conditioning and good nutrition. People who are fit are less susceptible to hypothermia. And don't let yourself become weakened through fatigue.
•    Try to stay in a heated environment, but not so hot as to cause excessive sweating. You risk hypothermia when you seek to cool down by leaving a hot environment for a cool one.
•    Eat high energy food, such as nuts and raisins.
•    Avoid alcohol, coffee, tea and tobacco. They can cause heat loss.
•    If you are traveling (on the road or in the wilderness) carry emergency supplies.
Sudden heart attacks increase during a cold snap. Cold air can cause blood pressure to go up, especially when skin is exposed. Another danger is hypothermia, sometimes called exposure. Shivering is a serious warning sign to seek a warmer, sheltered place.
What to do if you Suspect Hypothermia
If you suspect hypothermia, take measures to prevent further heat loss and get medical help as quickly as possible. Continue the warming efforts even if there is little or no pulse or heartbeat. Severe hypothermia can be mistaken for death.
Move the casualty to a dry, warm location if possible, or provide protection from the wind. Keep the person in a horizontal position. If you can't replace wet clothes with dry ones, cover the wet clothes with warm dry clothing or blankets, and place something warm and dry under the casualty. If the person is conscious, supply a warm drink, but avoid alcohol and caffeine.
Knowing first aid is a tremendous help. But most deaths from hypothermia can be prevented if you use common sense.
Shoveling All That Snow