In summer, the climatic conditions to which workers are exposed can be the cause of work accidents, some of them fatal. Heat stress due to high temperature, commonly known as heat stroke, is the heat load that workers receive and accumulate in their bodies and which results from the interaction between the environmental conditions of the place where they work, the physical activity they perform and the clothes they wear.
Exposure to heat can cause various health effects, of different severity, such as rash on the skin, edema of the extremities, burns, muscle cramps, dehydration, exhaustion, etc. But, undoubtedly, the most serious effect of exposure to situations of intense heat is heat stroke. When the so-called heat stroke occurs, the body temperature exceeds 40.6 ºC (105.08 ºF) , being mortal between 15% and 25% of cases.
Symptomatology of thermal sensation due to heat
Symptoms of a heat stroke |
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General Symotoms |
Internal temperature higher than 40.6ºC (105.08 ºF)
Tachycardia Fast breathing Headache Nausea and vomiting |
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Cutaneous symptoms
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Dry and hot skin
Absence of sweating |
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Sensorineural symptoms
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Confusion and seizures
Loss of consciousness Dilated pupils |
General preventive measures
These measures are applicable to all work, in closed or outdoor places, where heat stress is usually caused by heat.
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The employer must…
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The employee must…
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| 1 |
Inform and train workers about the risks, effects and preventive measures. Train them in the recognition of the first symptoms of the heat affections in themselves and their companions and in the application of first aid.
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Inform your superiors if you are acclimated or not to heat; if you have ever had problems with the heat; chronic diseases that may suffer; if they are taking any medication.
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| 2 |
Take care that all workers are acclimatized to the heat according to the physical effort they are going to make. Allow them to adapt the work rhythms to their tolerance to heat.
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Adapt the work rate to your tolerance to heat.
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Have resting places cool, covered or in the shade, and allow workers to rest when they need it and especially when they feel bad
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Rest in cool places when they are very hot. If you feel bad, stop the activity and rest in a cool place until you recover, because continuing to work can be very dangerous. Avoid driving if you are not fully recovered.
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Provide fresh water and instruct workers to drink it frequently.
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Drink water frequently during work even if you are not thirsty. It is also necessary to continue drinking water when you are away from work.
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| 5 |
Modify work processes to eliminate or reduce the emission of heat and humidity and excessive physical effort. Provide mechanical help to decrease the latter.
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