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Cold stress could affect workers whose jobs are primarily out in the yard. Now is a good time to review and increase awareness of this “hidden hazard”.
Hazards associated with cold stress are not limited to just those areas accustomed to severely cold temperatures. Cold stress can occur even with temperatures as high as 60°F.
The information below describing types of cold stress, symptoms, and prevention measures was extracted from the OSHA website on Winter Weather.
How cold is too cold? What constitutes extreme cold and its effects can vary across different areas of the country. In regions that are not used to winter weather, near freezing temperatures are considered "extreme cold." A cold environment forces the body to work harder to maintain its temperature. Whenever temperatures drop below normal and wind speed increases, heat can leave your body more rapidly.
Wind chill is the temperature your body feels when air temperature and wind speed are combined. For example, when the air temperature is 40°F, and the wind speed is 35 mph, the effect on the exposed skin is as if the air temperature was 28°F.
Cold stress occurs by driving down the skin temperature and eventually the internal body temperature (core temperature). This may lead to serious health problems, and may cause tissue damage, and possibly death.
What are the risk factors that contribute to cold stress?
Some of the risk factors that contribute to cold stress are:
How does the body react to cold conditions? In a cold environment, most of the body's energy is used to keep the internal core temperature warm. Over time, the body will begin to shift blood flow from the extremities (hands, feet, arms, and legs) and outer skin to the core (chest and abdomen). This shift allows the exposed skin and the extremities to cool rapidly and increases the risk of frostbite and hypothermia. Combine this scenario with exposure to a wet environment, and trench foot may also be a problem.
What are the most common cold induced illnesses/injuries?
What is hypothermia? Hypothermia occurs when body heat is lost faster than it can be replaced and the normal body temperature (98.6°F) drops to less than 95°F. Hypothermia is most likely at very cold temperatures, but it can occur even at cool temperatures (above 40°F), if a person becomes chilled from rain, sweat, or submersion in cold water.
What are the symptoms of hypothermia?
What can be done for a person suffering from hypothermia?
*Chest compression are recommended only if the patient will not receive medical care within 3 hours.
What is frostbite? Frostbite is an injury to the body that is caused by freezing of the skin and underlying tissues. The lower the temperature, the more quickly frostbite will occur. Frostbite typically affects the extremities, particularly the feet and hands. Amputation may be required in severe cases.
What are the symptoms of frostbite?
What can be done for a person suffering from frostbite?
What is immersion/trench foot? Trench Foot or immersion foot is caused by prolonged exposure to wet and cold temperatures. It can occur at temperatures as high as 60°F if the feet are constantly wet. Non-freezing injury occurs because wet feet lose heat 25-times faster than dry feet. To prevent heat loss, the body constricts the blood vessels to shut down circulation in the feet. The skin tissue begins to die because of a lack of oxygen and nutrients and due to the buildup of toxic products.
What are the symptoms of trench foot?
What can be done for a person suffering from immersion foot?