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Heat Stress

Heat Stress. Hot work environments. Outdoor work in hot weather Foundry work Smelting Brick-firing, ceramics, or glass manufacture. 1a. Hot work environments. Rubber manufacture Work in bakeries, confectioneries, kitchens Laundry operations. 1b. Risk factors.

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Heat Stress

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  1. Heat Stress

  2. Hot work environments • Outdoor work in hot weather • Foundry work • Smelting • Brick-firing, ceramics, or glass manufacture 1a

  3. Hot work environments • Rubber manufacture • Work in bakeries, confectioneries, kitchens • Laundry operations 1b

  4. Risk factors • Not everyone is affected equally • Age, weight, physical fitness • Metabolism, medications, use of alcohol/drugs • Air temperature 2a

  5. Risk factors • Humidity • Direct sun • Radiant heat sources • Clothing 2b

  6. How heat causes fatigue • Blood circulates to upper layers of skin • Less blood is available to provide energy to active muscles, brain, internal organs 3a

  7. How heat causes fatigue • Performance, coordination, alertness all decline • Gradually adjust to working in hot conditions 3b

  8. Heat rash • Results from body’s natural cooling mechanisms • Body heat is released through sweating • If sweat ducts become plugged, a rash can develop 4a

  9. Heat rash • Rash is very uncomfortable, can become infected • Rest in a cool area • Bathe and dry the skin ASAP 4b

  10. Fainting • Fainting can be a reaction to the heat • As blood is circulated to extremities, it can accumulate in the lower part of the body 5a

  11. Fainting • Fainting can occur if the brain does not get enough blood • Lie down in a cool area 5b

  12. Muscle cramps • Occur in tired muscles when worker sweats profusely and drinks large amounts of water • Sweating removes salt from the body • Drinking dilutes body fluids 6a

  13. Muscle cramps • Low salt levels can cause painful spasms • Too much salt can also cause cramps • Drink 5 to 7 ounces of water every 15 to 20 minutes 6b

  14. Muscle cramps • Thirst is not a reliable indicator of the need for water in a hot environment • Avoid drinking beverages containing caffeine or alcohol 6c

  15. Heat exhaustion • Results when a person has lost large amounts of fluid by sweating 7a

  16. Heat exhaustion • Symptoms resemble early heat stroke • Fatigued • Giddy • Nauseous • Headache 7b

  17. Heat exhaustion • Person sweats • Skin is clammy and moist • Body temperature remains at or near normal 7c

  18. Heat exhaustion • Victim may vomit/lose consciousness in extreme cases • Move victim to cool place and give plenty of liquids 7d

  19. Heat stroke • Life-threatening condition • Occurs when body’s temperature regulatory system fails • Sweating becomes inadequate to remove excess heat 8a

  20. Heat stroke • Skin is hot and dry • Body temperature is 105 degrees F or higher • Victim is mentally confused or delirious 8b

  21. Heat stroke • Victim may have convulsions or become unconscious • Get immediate medical attention • Move victim to cool area 8c

  22. Heat stroke • Soak clothing in water • Fan the body • Never leave unattended 8d

  23. Measuring/evaluating heat exposures • Heat index system • Health and safety agency testing 9a

  24. Measuring/evaluating heat exposures • Work classifications: • Light hand work • Heavy hand work • Heavy work with one arm • Light work with two arms • Moderate work with the body • Heavy work with the body 9b

  25. Controlling heat stress • Engineering controls • Work practice controls • PPE 10a

  26. Controlling heat stress • Take intermittent rest periods with water breaks • Use relief workers • Pace the work 10b

  27. Controlling heat stress • Reduce physical demands • Use cool recovery or rest areas • Schedule work for cooler times of day 10c

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