As the temperatures drop and the snow accumulates, many individuals will slowly start to hibernate indoors and become less and less active. Outdoor exercise in the winter can become a challenge due to ice, snow and freezing temperatures. While the cold winter months aren’t for everyone, outdoor exercise and physical activity can still be enjoyed with some extra planning, winter-specific gear and layers. Common winter-related injuries include hypothermia, frostbite and cold- induced asthma, as well as injuries sustained while slipping and falling on ice.
Hypothermia develops when heat loss exceeds heat production. Mild hypothermia is characterized by shivering, dizziness, nausea, quick breathing, confusion, increased heart rate, lack of coordination and fatigue. Coaches and athletes need to be aware of these signs and symptoms in order to prevent further injury. As moderate to severe hypothermia sets in, you will notice lack of coordination, slurred speech, slow-shallow breathing, weak pulse, drowsiness and confusion. Moderate-severe hypothermia can be life-threatening and requires immediate medical attention.
- Energy depletion/fasting: Shivering is a protective response to produce heat through muscle activity. Food restriction and energy depletion have been shown to impair the shivering response, thus increasing the risk for hypothermia;
- Lack of sleep/fatigue;
- Wet clothing from sweat, wind, immersion in water and exercise in rain;
- Low body fat – Athletes with a higher percentage of body fat can maintain core temperatures better than leaner athletes;
- Age – People over the age of 60 and young children are both at increased risk for hypothermia.
Clothing: Clothing plays a major factor in the prevention of hypothermia. Layers are the best option in order to avoid overheating and prevent excessive sweating, while staying warm and dry. Your base layer should be lightweight polyester/polypropylene, which should not readily absorb moisture (cotton would be a bad choice for a base layer), but should wick moisture to the outer layers where it can evaporate. The middle layer should be polyester fleece or wool, which provides the insulation and warmth. The outer layer should be a shell, which will repel wind and rain and have venting to allow for moisture to escape.
Food and Fluid Intake: Surprisingly, all those extra layers, heavy gear and shivering can make you expend more energy compared to the same exercise done in warmer weather. Furthermore, dehydration in cold weather is common, since thirst is normally less noticeable in colder weather. Ensure adequate fluid and food intake prior to, during and after exercise.
Frostbite is most common in exposed skin, such as the nose, ears and cheeks, as well as the fingers and toes. The first sign of frostbite is numbness in the body part. While warming up of the area, people will experience pain, burning, tingling and aching. The skin will appear red, then turn white, with possible blisters, depending on the severity.
- Inadequate clothing;
- Tight boots or constrictive clothing;
- Wind chill and cold temperatures.
Prevention: Windchill plays a major factor in temperatures below -27, whereby frostbite can occur in less than 30 min. Clothing is your best option for prevention with dry, warm clothing and layers being the most important. Mittens provide more protection than gloves. Also remember to keep your gloves, socks, scarves and hats dry. If exercise has made these garments sweaty and damp, you will be at an increased risk for frostbite. Have extra gear if you get wet or sweaty, or take off some layers as you start to overheat.
Cold-induced asthma is caused by a narrowing of the airways while exercising in cold weather. It can occur to individuals with asthma, as well as