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The following is from the OSHA website:
During emergency response activities or recovery operations, workers may be required
to work in cold environments, and sometimes for extended periods. Cold stress is a common problem encountered in these
types of situations. The following frequently asked questions will help workers understand what cold stress is,
how it may affect their health and safety, and how it can be prevented.
cold is too cold?
When the body is unable
to warm itself, cold related stress may result. This may include tissue damage and possibly death. Four factors contribute
to cold stress: cold air temperatures, high velocity air movement, dampness of the air, and contact with cold water or surfaces.
A cold environment forces the body to work harder to maintain it's temperature. Cold air, water, and snow all draw heat from
the body. Wind chill is the combination of air temperature and wind speed. For example, when the air temperature is 40°F,
and the wind speed is 35 mph, your exposed skin receives conditions equivalent to the air temperature being 11° F. While it
is obvious that below freezing conditions combined with inadequate clothing could bring about cold stress, it is also important
to understand that it can also be brought about by temperatures in the 50's coupled with some rain and wind.
How does the body react to cold conditions?
When in a cold environment,
most of your body's energy is used to keep your internal temperature warm. Over time, your body will begin to shift blood
flow from your extremities (hands, feet, arms, and legs) and outer skin to the core (chest and abdomen). This allows exposed
skin and the extremities to cool rapidly and increases the risk of frostbite and hypothermia. Combine this with cold water,
and trench foot may also be a problem.
What are the most common cold
Hypothermia, Frostbite, and Trench Foot.
Hypothermia which means "low heat",
is a potentially serious health condition. This occurs when body heat is lost faster than it can be replaced. When the core
body temperature drops below the normal 98.6° F to around 95° F, the onset of symptoms normally begins. The person may begin
to shiver and stomp their feet in order to generate heat. Workers may lose coordination, have slurred speech, and fumble with
items in the hand. The skin will likely be pale and cold. As the body temperature continues to fall these symptoms will worsen
and shivering will stop. Workers may be unable to walk or stand. Once the body temperature falls to around 85° F severe hypothermia
will develop and the person may become unconscious, and at 78°, the person could die.
Anyone working in a cold environment
may be at risk for cold stress. However, older people may be at more risk than younger adults, since older people are not
able to generate heat as quickly. Certain medications may prevent the body from generating heat normally. These include anti-depressants, sedatives, tranquilizers and others.
on the severity of the hypothermia. For cases of mild hypothermia move to warm area and stay active.
Remove wet clothes and replace with dry clothes or blankets, cover the head. To promote metabolism and assist in raising internal
core temperature drink a warm (not hot) sugary drink. Avoid drinks with caffeine. For more severe cases
do all the above, plus contact emergency medical personnel (Call 911 for an ambulance), cover all extremities completely,
place very warm objects, such as hot packs or water bottles on the victim's head, neck, chest and groin. Arms and legs should
be warmed last. In cases of severe hypothermia treat the worker very gently and do not apply
external heat to re-warm. Hospital treatment is required.
If worker is in the water and unable to exit, secure collars,
belts, hoods, etc. in an attempt to maintain warmer water against the body. Move all extremities as close to the torso as
possible to conserve body heat.
What is Frostbite?
Frostbite occurs when the skin actually freezes and loses water. In severe cases, amputation of the frostbitten
area may be required. While frostbite usually occurs when the temperatures are 30° F or lower, wind chill factors can allow
frostbite to occur in above freezing temperatures. Frostbite typically affects the extremities, particularly the feet and
hands. The affected body part will be cold, tingling, stinging or aching followed by numbness. Skin color turns red, then
purple, then white, and is cold to the touch. There may be blisters in severe cases.
Do not rub the area to warm it.
Wrap the area in a soft cloth, move the worker to a warm area, and contact medical personnel. Do not leave the worker alone.
If help is delayed, immerse in warm (maximum 105 °F), not hot, water. Do not pour water on affected part. If there is a chance
that the affected part will get cold again do not warm. Warming and recooling will cause severe tissue damage.
What is Trench Foot?
Trench Foot or immersion
foot is caused by having feet immersed in cold water at temperatures above freezing for long periods of time. It is similar
to frostbite, but considered less severe. Symptoms usually consist of tingling, itching or burning sensation. Blisters may
Soak feet in warm water, then wrap with dry cloth bandages. Drink a warm, sugary drink.
What preventive measures should I take?
Plan for work
in cold weather. Wearing appropriate clothing and being aware of how your body is reacting to the cold are important to preventing
cold stress. Avoiding alcohol, certain medications and smoking can also help to minimize the risk.
Protective Clothing is the most important way to avoid cold stress. The type of fabric also makes
a difference. Cotton loses its insulation value when it becomes wet. Wool, on the other hand, retains its insulation even
when wet. The following are recommendations for working in cold environments:
- Wear at least three layers of clothing. An outer layer to break the wind
and allow some ventilation (like Gortex® or nylon). A middle layer of down or wool to absorb sweat and provide insulation
even when wet. An inner layer of cotton or synthetic weave to allow ventilation.
- Wear a hat. Up to 40% of body heat can be lost when the head is left exposed.
- Wear insulated boots or other footwear.
- Keep a change of dry clothing available in case work clothes become wet.
- Do not wear tight clothing. Loose clothing allows better ventilation.
Work Practices and planning
are important preventative measures. Drink plenty of liquids, avoiding caffeine and alcohol. It is easy to become
dehydrated in cold weather. If possible, heavy work should be scheduled during the warmer parts of the day. Take breaks out
of the cold. Try to work in pairs to keep an eye on each other and watch for signs of cold stress. Avoid fatigue since energy
is needed to keep muscles warm. Take frequent breaks and consume warm, high calorie food such as pasta to maintain energy
Engineering controls can be effective in reducing the risk of cold stress.
Radiant heaters may be used to warm workers. Shielding work areas from drafts or wind will reduce wind chill. Use insulating
material on equipment handles, especially metal handles, when temperatures drop below 30° F.
Training in recognition and treatment is important. Supervisors, workers and coworkers should watch
for signs of cold stress and allow workers to interrupt their work if they are extremely uncomfortable. Supervisors should
also ensure that work schedules allow appropriate rest periods and ensure liquids are available. They should use appropriate
engineering controls, personal protective equipment and work practices to reduce the risk of cold stress. All of these measures
should be incorporated into the relevant health and safety plans.