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Heat Stress - PowerPoint PPT Presentation

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


hot work environments1
Hot work environments
  • Rubber manufacture
  • Work in bakeries, confectioneries, kitchens
  • Laundry operations


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


risk factors1
Risk factors
  • Humidity
  • Direct sun
  • Radiant heat sources
  • Clothing


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


how heat causes fatigue1
How heat causes fatigue
  • Performance, coordination, alertness all decline
  • Gradually adjust to working in hot conditions


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


heat rash1
Heat rash
  • Rash is very uncomfortable, can become infected
  • Rest in a cool area
  • Bathe and dry the skin ASAP


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


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


muscle cramps
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


muscle cramps1
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


muscle cramps2
Muscle cramps
  • Thirst is not a reliable indicator of the need for water in a hot environment
  • Avoid drinking beverages containing caffeine or alcohol


heat exhaustion
Heat exhaustion
  • Results when a person has lost large amounts of fluid by sweating


heat exhaustion1
Heat exhaustion
  • Symptoms resemble early heat stroke
    • Fatigued
    • Giddy
    • Nauseous
    • Headache


heat exhaustion2
Heat exhaustion
  • Person sweats
  • Skin is clammy and moist
  • Body temperature remains at or near normal


heat exhaustion3
Heat exhaustion
  • Victim may vomit/lose consciousness in extreme cases
  • Move victim to cool place and give plenty of liquids


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


heat stroke1
Heat stroke
  • Skin is hot and dry
  • Body temperature is 105 degrees F or higher
  • Victim is mentally confused or delirious


heat stroke2
Heat stroke
  • Victim may have convulsions or become unconscious
  • Get immediate medical attention
  • Move victim to cool area


heat stroke3
Heat stroke
  • Soak clothing in water
  • Fan the body
  • Never leave unattended


measuring evaluating heat exposures
Measuring/evaluating heat exposures
  • Heat index system
  • Health and safety agency testing


measuring evaluating heat exposures1
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


controlling heat stress
Controlling heat stress
  • Engineering controls
  • Work practice controls
  • PPE


controlling heat stress1
Controlling heat stress
  • Take intermittent rest periods with water breaks
  • Use relief workers
  • Pace the work


controlling heat stress2
Controlling heat stress
  • Reduce physical demands
  • Use cool recovery or rest areas
  • Schedule work for cooler times of day