ACC Safety Bulletin: Hypothermia

In the sub-zero temperatures of winter, it’s easy to remember that hypothermia can be a concern. However, it’s not just a winter hazard! No matter where we are in Canada, summer conditions vary widely and can change quickly. In many places – and especially in mountainous regions – temperatures drop quickly as the sun goes down. Getting stuck in the wind and rain can dramatically drop a person’s body temperature.

Hypothermia can even set in on hot sunny days. On a 35C sunny day I’ve had my body temperature drop dramatically after finishing a gruelling trail race. By the time I arrived at the finish, my energy stores were depleted; once I stopped moving, the sweat evaporating from my skin gave me quite the chill. With a snack and some dry clothes I was soon warm again, but this got me thinking about what could happen if someone is injured and immobile.

Without the ability to move around to stay warm, an injured person is at risk of developing hypothermia even in mild conditions. Shock from the injury, exhaustion and low energy stores can compound the issue. No matter what the season, it’s always a good idea to have a few lightweight pieces of equipment to protect you from the elements. Extra layers (i.e. at least one more layer than you are intending to wear) and extra snacks are always a good idea. A lightweight tarp can shelter an injured person from the elements (and provide a dry place for lunch). Insulation from the ground is just as important; a small pad, or even your packs and/or rope can help you stay warm.