Millions of people must sweat their way through the workweek. If you're one of those getting hot under the collar at work, you should be aware of the many health problems associated with laboring in extreme heat.
Extreme heat can lead to on-the-job accidents and cause less serious ills like heat cramps, prickly heat and heat exhaustion. In rare cases, heat can even be deadly. Heat stroke occurs when the body's regulatory system fails and body temperature rises too high, and can cause brain damage or death.
How hot is too hot?
The answer varies according to your overall fitness and the type of physical activity the work requires. No matter what the temperature is around you, your body tries to maintain its regular internal temperature of 37 degrees Celsius. For most people, that means we're comfortable working in an environment of about 22 degrees Celsius (with 45 percent humidity), but that ideal could drop as low as 12 degrees Celsius if your work is extremely labor intensive.
What happens to the body under extreme heat conditions?
If your body is not used to working in extreme heat or "acclimatized," its first reaction will likely be to increase your internal temperature -- in other words, to give you a fever. Working in this state increases your pulse rate, strains the heart and may cause a life-threatening heat stroke in severe cases.
Of course, your body will work hard to bring down your temperature. It sheds excess heat primarily through sweating, which cools off the body. That's why humid conditions or clothing that doesn't allow for evaporation foil the body's attempts at cooling itself through sweating.
But if you're not yet used to heat, your body sweats inefficiently. Not only will it not sweat enough, but it'll also produce high salt content sweat, which depletes the body of electrolytes and can cause heat exhaustion. Once your body becomes used to the heat, it sweats more efficiently.
The body also sheds excess heat by altering your blood circulation. The heart begins to pump more blood into the small blood vessels near the skin's surface, where the heat of the blood is transferred to the cooler outside environment. However, this method is only effective if the outside environment is cooler than the body's 37 degrees Celcius. In a person unaccustomed to the climate, this change in circulation puts extra stress on the heart.
What can working in extreme heat do to me?
Fainting or heat collapse. This usually occurs in the unacclimatized worker because the brain isn't receiving enough oxygen. (Because the heart is pumping blood out to the capillaries in a frantic attempt to cool down the body, the blood pools in the extremities instead of returning to the heart to be pumped up to the brain). Workers who stand erect and immobile are especially prone to fainting. Fainting can be extremely dangerous if workers fall while they're operating heavy or hot equipment. It can be prevented by gradually acclimatizing workers to the environment. Treat this by cooling the person, administering fluids and evaluating any injury that may have occurred from fainting.
Heat stroke. This is the most serious health problem caused by working in hot environments, and early recognition and treatment of it is critical. Symptoms include:
Dilated pupils
Confusion
Angry behavior
Delirium
Convulsions
The victim needs immediate first aid, followed by hospitalization, to prevent brain damage or death. Emergency medical treatment is crucial.
Take the individual to a cool area
Soak their clothes with water
Vigorously fan the body until help arrives
Do not give the victim fluids to drink
Heat exhaustion. This condition is caused by losing large amounts of fluid through sweating. Symptoms range from extreme weakness or fatigue, giddiness, nausea, chills and headache to vomiting or fainting. The skin will be clammy and moist, and the complexion can be pale or flushed, but the body temperature will be normal or only slightly elevated. The pupils will be normal as well. Treat by having the victim lie down in a cool place and drink cool, nonalcoholic liquids; severe cases may require medical treatment.
Heat cramps. These are painful muscle spasms caused by electrolyte imbalances in the body. They usually occur among workers performing hard physical labor, sweat profusely and drink too much or too little water (cramps can be caused by a deficiency or an excess of salt in the body). To prevent heat cramps in a hot environment, workers should drink about a cup of either water or electrolyte solution every 20 minutes. Once someone has heat cramps, clear juice or an electrolyte solution can help alleviate them. Seek medical treatment if cramps persist for an hour or more.
Heat rash/prickly heat. This is one of the most common problems in hot, humid work environments. It occurs when sweat cannot evaporate off the skin -- either because the environment is too humid or because of inappropriate clothing. Sweat ducts become plugged, causing red papules, or bumps, to appear on the skin. Heat rash is very uncomfortable, especially when complicated by a subsequent infection. Treat it by resting in a cool place periodically and by regularly washing with soap and water and drying the skin. To prevent a rash, avoid wearing synthetic clothing. Natural fiber, such as cotton, is best.
Accidents. Working in hot environments can promote accidents such as burns and mishaps caused by slippery, sweaty palms or fogged safety glasses. Less obvious are accidents caused because workers are experiencing physical and mental fatigue from heat stress. Be careful to take breaks in cool areas and drink plenty of fluids.
Are there people who shouldn't work under extreme heat conditions?
If you're overweight, have heart problems or are on a low-sodium diet, consult your physician before doing this work. You may also be more vulnerable to heat if you are taking diuretics, thyroid medicines, tricyclic antidepressants and some antipsychotic medications.
How can I protect myself?
Wear loose-fitting clothing, take frequent breaks in a cool rest area, open windows and install fans, and get plenty of fluids (a cup of water every 20 minutes or so under extremely hot conditions). Avoid beer and other alcoholic drinks.
Source: HealthDay
