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Heat StressHeat Stress
Hot work environmentsHot work environments
Outdoor work in hot weatherOutdoor work in hot weather
Foundry workFoundry work
SmeltingSmelting
Brick-firing, ceramics, Brick-firing, ceramics, or glass manufactureor glass manufacture
1a
Hot work environmentsHot work environments
Rubber manufactureRubber manufacture
Work in bakeries, confectioneries, Work in bakeries, confectioneries, kitchenskitchens
Laundry operationsLaundry operations
1b
Risk factorsRisk factors
Not everyone is affected equallyNot everyone is affected equally• Age, weight, physical fitnessAge, weight, physical fitness• Metabolism, medications, use of Metabolism, medications, use of
alcohol/drugsalcohol/drugs
Air temperatureAir temperature
2a
Risk factorsRisk factors
HumidityHumidity
Direct sunDirect sun
Radiant heat sourcesRadiant heat sources
ClothingClothing
2b
How heat causes fatigueHow heat causes fatigue
Blood circulates to upper layers of Blood circulates to upper layers of skinskin
Less blood is available to provide Less blood is available to provide energy to active muscles, brain, energy to active muscles, brain, internal organsinternal organs
3a
How heat causes fatigueHow heat causes fatigue
Performance, coordination, Performance, coordination, alertness all declinealertness all decline
Gradually adjust to working in hot Gradually adjust to working in hot conditionsconditions
3b
Heat rashHeat rash
Results from body’s natural cooling Results from body’s natural cooling mechanismsmechanisms
Body heat is released through Body heat is released through sweatingsweating
If sweat ducts become plugged, a If sweat ducts become plugged, a rash can developrash can develop
4a
Heat rashHeat rash
Rash is very uncomfortable, can Rash is very uncomfortable, can become infectedbecome infected
Rest in a cool areaRest in a cool area
Bathe and dry the skin ASAPBathe and dry the skin ASAP
4b
FaintingFainting
Fainting can be a reaction to the Fainting can be a reaction to the heatheat
As blood is circulated to As blood is circulated to extremities, it can accumulate in extremities, it can accumulate in the lower part of the bodythe lower part of the body
5a
FaintingFainting
Fainting can occur if the brain does Fainting can occur if the brain does not get enough bloodnot get enough blood
Lie down in a cool areaLie down in a cool area
5b
Muscle crampsMuscle cramps
Occur in tired muscles when Occur in tired muscles when worker sweats profusely and drinks worker sweats profusely and drinks large amounts of waterlarge amounts of water
Sweating removes Sweating removes salt from the bodysalt from the body
Drinking dilutes Drinking dilutes body fluidsbody fluids
6a
Muscle crampsMuscle cramps
Low salt levels can cause painful Low salt levels can cause painful spasmsspasms
Too much salt can also cause Too much salt can also cause crampscramps
Drink 5 to 7 ounces Drink 5 to 7 ounces of water every 15 of water every 15 to 20 minutesto 20 minutes
6b
Muscle crampsMuscle cramps
Thirst is not a reliable indicator of Thirst is not a reliable indicator of the need for water in a hot the need for water in a hot environmentenvironment
Avoid drinking Avoid drinking beverages beverages containing caffeine containing caffeine or alcoholor alcohol
6c
Heat exhaustionHeat exhaustion
Results when a person has lost Results when a person has lost large amounts of fluid by sweatinglarge amounts of fluid by sweating
7a
Heat exhaustionHeat exhaustion
Symptoms resemble early heat Symptoms resemble early heat strokestroke• FatiguedFatigued• GiddyGiddy• NauseousNauseous• HeadacheHeadache
7b
Heat exhaustionHeat exhaustion
Person sweatsPerson sweats
Skin is clammy and Skin is clammy and moistmoist
Body temperature Body temperature remains at or near remains at or near normalnormal
7c
Heat exhaustionHeat exhaustion
Victim may vomit/lose Victim may vomit/lose consciousness in extreme casesconsciousness in extreme cases
Move victim to cool Move victim to cool place and give plenty place and give plenty of liquidsof liquids
7d
Heat strokeHeat stroke
Life-threatening conditionLife-threatening condition
Occurs when body’s temperature Occurs when body’s temperature regulatory system failsregulatory system fails
Sweating becomes Sweating becomes inadequate to inadequate to remove excess heatremove excess heat
8a
Heat strokeHeat stroke
Skin is hot and drySkin is hot and dry
Body temperature is 105 degrees F Body temperature is 105 degrees F or higheror higher
Victim is mentally Victim is mentally confused or confused or deliriousdelirious
8b
Heat strokeHeat stroke
Victim may have convulsions or Victim may have convulsions or become unconsciousbecome unconscious
Get immediate medical attentionGet immediate medical attention
Move victim to cool Move victim to cool areaarea
8c
Heat strokeHeat stroke
Soak clothing in waterSoak clothing in water
Fan the bodyFan the body
Never leave Never leave unattendedunattended
8d
Measuring/evaluating heat Measuring/evaluating heat exposuresexposures
Heat index systemHeat index system
Health and safety agency testingHealth and safety agency testing
9a
Measuring/evaluating heat Measuring/evaluating heat exposuresexposures
Work classifications:Work classifications:• Light hand workLight hand work• Heavy hand workHeavy hand work• Heavy work with one armHeavy work with one arm• Light work with two armsLight work with two arms• Moderate work with the bodyModerate work with the body• Heavy work with the bodyHeavy work with the body
9b
Controlling heat stressControlling heat stress
Engineering controlsEngineering controls
Work practice controlsWork practice controls
PPEPPE
10a
Controlling heat stressControlling heat stress
Take intermittent rest periods with Take intermittent rest periods with water breakswater breaks
Use relief workersUse relief workers
Pace the Pace the workwork
10b
Controlling heat stressControlling heat stress
Reduce physical demandsReduce physical demands
Use cool recovery or rest areasUse cool recovery or rest areas
Schedule Schedule work for work for cooler cooler times of daytimes of day
10c
