In beautiful Saratoga, we rarely experience outdoor temperatures that are considered dangerously low for exercising. Lucky for us, we can usually get away with just a track suit on even the chilliest mornings. But if you plan to travel this winter, or if you're especially sensitive to cooler temperatures, read on to learn how to protect yourself...
Exercising in the Cold
The biggest concern for exercising in the cold is hypothermia, or too much heat loss. When you exercise in a cold environment you must consider one primary factor: How much heat will your body lose during exercise?
Heat loss is controlled in two ways:
Insulation, consisting of body fat plus clothing
Environmental factors, including temperature, wind and whether you’re exercising in the air or in the water. Each of these factors plays a role in the body’s ability to maintain a comfortable temperature during exercise.
Clothing adds to the insulation barrier and is clearly the most important element in performance and comfort while exercising in the cold. Generally, heat loss from the head alone is about 50% at the freezing mark, and by simply wearing a helmet or hat, a person can stay outside indefinitely.
Clothing is generally a good insulator because it has the ability to trap air, a poor conductor of heat. If the air trapped by the clothing cannot conduct the heat away from the body, temperature will be maintained. Unlike air, however, water is a rapid conductor of heat and people will sweat and risk significant heat loss even in the coldest of temperatures. With this in mind, you want to choose clothing that can trap air but allow sweat to pass through, away from the body.
By wearing clothing in layers, you have the ability to change the amount of insulation that is needed. While many new products can provide such a layered barrier, it is important to avoid heavy cotton sweats or tightly woven material that will absorb and retain water. Because these materials cannot provide a layer of dry air near the skin, they can increase the amount of heat your body loses as you exercise.
Keeping the hands and feet warm is a common concern when exercising in the cold. Lower temperatures cause blood to be shunted away from the hands and feet to the center of the body to keep the internal organs warm and protected. Superficial warming of the hands will return blood flow to prevent tissue damage. Blood flow will not return to the feet unless the temperature of the torso is normal or slightly higher [0.5 to 1.0 degree Fahrenheit (F) above normal]. So, to keep your feet warm you must also keep the rest of your body warm at all times.
Check With the Weatherman
Always check the air temperature and wind chill factor before exercising in the cold. Data from the National Safety Council suggest little danger to individuals with properly clothed skin exposed at 20° F, even with a 30 mph wind. A danger does exist for individuals with exposed skin when the wind-chill factor (a combined effect of temperature and wind) falls below –20° F.
That can be achieved by any combination of temperatures below 20° F with a wind of 40 mph and temperatures below –20° F with no wind. If you are exercising near the danger zone for skin exposure, it also is advisable to warm the air being inhaled by wearing a scarf or mask over your nose and mouth.