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OSHA 366 Portland State University Heat Stress Discussion and Responses

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NIOSH Safety and Health Topic: Heat Stress Overview Workers who are exposed to extreme heat or work in hot environments may be at risk of heat stress. Exposure to extreme heat can result in occupational illnesses and injuries. Heat stress can result in heat stroke, heat exhaustion, heat cramps, or heat rashes. Heat can also increase the risk of injuries in workers as it may result in sweaty palms, fogged-up safety glasses, and dizziness. Burns may also occur as a result of accidental contact with hot surfaces or steam. Summer Hazards for Workers – now on the NIOSH Science Blog. Read it and share your comments… Workers at risk of heat stress include outdoor workers and workers in hot environments such as firefighters, bakery workers, farmers, construction workers, miners, boiler room workers, factory workers, and others. Workers at greater risk of heat stress include those who are 65 years of age or older, are overweight, have heart disease or high blood pressure, or take medications that may be affected by extreme heat. Prevention of heat stress in workers is important. Employers should provide training to workers so they understand what heat stress is, how it affects their health and safety, and how it can be prevented. Types of Heat Stress Heat Stroke | Heat Exhaustion | Heat Syncope | Heat Cramps | Heat Rash Heat Stroke Heat stroke is the most serious heat-related disorder. It occurs when the body becomes unable to control its temperature: the body’s temperature rises rapidly, the sweating mechanism fails, and the body is unable to cool down. When heat stroke occurs, the body temperature can rise to 106 degrees Fahrenheit or higher within 10 to 15 minutes. Heat stroke can cause death or permanent disability if emergency treatment is not given. Symptoms Symptoms of heat stroke include:  Hot, dry skin (no sweating)  Hallucinations  Chills  Throbbing headache  High body temperature  Confusion/dizziness  Slurred speech First Aid Take the following steps to treat a worker with heat stroke:  Call 911 and notify their supervisor.  Move the sick worker to a cool shaded area.  Cool the worker using methods such as: o Soaking their clothes with water. o Spraying, sponging, or showering them with water. o Fanning their body. Heat Exhaustion Heat exhaustion is the body’s response to an excessive loss of the water and salt, usually through excessive sweating. Workers most prone to heat exhaustion are those that are elderly, have high blood pressure, and those working in a hot environment. Symptoms Symptoms of heat exhaustion include:  Heavy sweating  Extreme weakness or fatigue  Dizziness, confusion  Nausea  Clammy, moist skin  Pale or flushed complexion  Muscle cramps  Slightly elevated body temperature  Fast and shallow breathing First Aid Treat a worker suffering from heat exhaustion with the following:  Have them rest in a cool, shaded or air-conditioned area.  Have them drink plenty of water or other cool, nonalcoholic beverages.  Have them take a cool shower, bath, or sponge bath. Heat Syncope Heat syncope is a fainting (syncope) episode or dizziness that usually occurs with prolonged standing or sudden rising from a sitting or lying position. Factors that may contribute to heat syncope include dehydration and lack of acclimatization. Symptoms Symptoms of heat syncope include:  Light-headedness  Dizziness  Fainting First Aid Workers with heat syncope should:  Sit or lie down in a cool place when they begin to feel symptoms.  Slowly drink water, clear juice, or a sports beverage. Heat Cramps Heat cramps usually affect workers who sweat a lot during strenuous activity. This sweating depletes the body’s salt and moisture levels. Low salt levels in muscles causes painful cramps. Heat cramps may also be a symptom of heat exhaustion. Symptoms Muscle pain or spasms usually in the abdomen, arms, or legs. First Aid Workers with heat cramps should:  Stop all activity, and sit in a cool place.  Drink clear juice or a sports beverage.  Do not return to strenuous work for a few hours after the cramps subside because further exertion may lead to heat exhaustion or heat stroke.  Seek medical attention if any of the following apply: o The worker has heart problems. o The worker is on a low-sodium diet. o The cramps do not subside within one hour. Heat Rash Heat rash is a skin irritation caused by excessive sweating during hot, humid weather. Symptoms Symptoms of heat rash include:  Heat rash looks like a red cluster of pimples or small blisters.  It is more likely to occur on the neck and upper chest, in the groin, under the breasts, and in elbow creases. First Aid Workers experiencing heat rash should:  Try to work in a cooler, less humid environment when possible.  Keep the affected area dry.  Dusting powder may be used to increase comfort. Recommendations for Employers Employers should take the following steps to protect workers from heat stress:  Schedule maintenance and repair jobs in hot areas for cooler months.  Schedule hot jobs for the cooler part of the day.  Acclimatize workers by exposing them for progressively longer periods to hot work environments.  Reduce the physical demands of workers.  Use relief workers or assign extra workers for physically demanding jobs.  Provide cool water or liquids to workers. o Avoid drinks with caffeine, alcohol, or large amounts of sugar.  Provide rest periods with water breaks.  Provide cool areas for use during break periods.  Monitor workers who are at risk of heat stress.  Provide heat stress training that includes information about: o Worker risk o Prevention o Symptoms o The importance of monitoring yourself and coworkers for symptoms o Treatment o Personal protective equipment Recommendations for Workers Workers should avoid exposure to extreme heat, sun exposure, and high humidity when possible. When these exposures cannot be avoided, workers should take the following steps to prevent heat stress:  Wear light-colored, loose-fitting, breathable clothing such as cotton. o Avoid non-breathing synthetic clothing.  Gradually build up to heavy work.  Schedule heavy work during the coolest parts of day.  Take more breaks in extreme heat and humidity. o Take breaks in the shade or a cool area when possible.  Drink water frequently. Drink enough water that you never become thirsty.  Avoid drinks with caffeine, alcohol, and large amounts of sugar.  Be aware that protective clothing or personal protective equipment may increase the risk of heat stress.  Monitor your physical condition and that of your coworkers. CDC Resources MMWR: Heat-Related Deaths among Crop Workers, 1992-2006 CDC: Extreme Heat Additional information on heat stress illnesses and prevention. En Español NIOSH: Criteria for a Recommended Standard: Occupational Exposure to Hot Environments (Revised Criteria 1986) This document presents the criteria, techniques, and procedures for the assessment, evaluation, and control of occupational heat stress by engineering and preventive work practices. Included are ways of predicting health risks, procedures for control of heat stress, and techniques for prevention and treatment of heat-related illnesses. NIOSH: Working in Hot Environments Workers who are suddenly exposed to working in a hot environment face additional and generally avoidable hazards to their safety and health. This publication discusses the safety and health consequences of heat stress. Health Hazard Evaluations  Health Hazard Evaluation Report, HETA 2004-0334-3017, Transportation Security Administration, Palm Beach International Airport, West Palm Beach, Florida  Health Hazard Evaluation Report, HETA 2003-0311-3052, Evaluation of Heat Stress at a Glass Bottle Manufacturer, Lapel, Indiana  Health Hazard Evaluation Report, HETA 2000-0061-2885, United States Air Force, Seymour Johnson air Force Base, Goldsboro, North Carolina Other Government Resources Occupational Safety and Health Administration (OSHA) Safety and Health Topics: Heat Stress Provides a guide to information regarding the recognition, evaluation, control, and compliance actions involving heat stress. External link:
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