Managing Heat Stress 2011
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Managing Heat Stress 2011



Hot and humid weather creates a higher risk of developing heat stress illnesses ranging from heat rash to life-threatening heat stroke. Heat stress is preventable if the proper precautions are taken. ...

Hot and humid weather creates a higher risk of developing heat stress illnesses ranging from heat rash to life-threatening heat stroke. Heat stress is preventable if the proper precautions are taken. I put together a Health and Safety training PowerPoint presentation for managing heat stress. The PowerPoint is uploaded in my files. Feel free to download it and share with others.



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  • Great Power Point Dan on heat stress! Thank you.

    Here's a link to another great free resource on heat stress -
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  • TrueTrueFalseTrueFalse (16 ounces per hour, not every 4 hours)FalseTrueTrueFalseFalse (by the time someone is thirsty, he/she is already 10% dehydrated)False (caffeine increases dehydration)True

Managing Heat Stress 2011 Managing Heat Stress 2011 Presentation Transcript

    Prepared by: Dan Sawall
    Heat stress can be more than a minor inconvenience for those who work in extremely warm conditions. Knowing how to prevent, identify and treat its symptoms can literally save lives.
    • Heat from the sun or work environment can create a life threatening emergency.
    • Heat stress occurs when the core body temperature rises and cannot be cooled by sweating.
    • Our bodies maintain a fairly constant internal temperature even though exposed to varying environmental temperatures.
    • To keep internal body temperatures within safe limits in hot conditions, the body gets rid of excess heat by evaporating sweat and varying the blood flow to the skin. These responses are controlled by the brain and usually occur when the blood exceeds 98.6º F.
  • Effects of Heat Stress On Your Body
    • Skin rash
    • Muscle cramps
    • Exhaustion
    • Fainting
    • Heat Stroke - life threatening!
  • External Factors Affecting Heat Stress
    • Humidity
    • Radiant heat (hot equipment, vessels and sun)
    • Air movement
    • Clothing
    • Work rate (difficulty of work)
    If these not controlled, HEAT STRESS MAY OCCUR!
  • Heat Rash
    Heat rash is the most common problem in hot work environments.
    • Prickly heat shown as red bumps on the skin; usually appears in areas where the clothing is restrictive
    • Sweat ducts plug; sweat cannot freely evaporate from skin
    • Wear breathable clothing (e.g. cotton)
    • Cleanse skin thoroughly
    • Keep skin dry
    • Apply calamine lotion
    • Sleep in cool location
  • Heat Cramps
    Cramps may result after excessive sweating and dehydration.
    • Shriveled skin, sunken eyes, dry mouth / tongue
    • Severe pain and cramps in legs and abdomen
    • Weakness, dizziness or fainting
    • Profuse sweating
    • Headaches
    • Increase fluid / salt intake
    • Drink at least 16 ounces of water per hour
    • Rest and move to a cool place
  • Heat Exhaustion
    Blood moves toward the outer body to remove heat. Blood pools in the skin leaving less for the brain.
    • Fatigue, headache, dizziness, profuse sweating, rapid pulse, thirst, loss of appetite, nausea, vomiting and fainting
    • Get to a shaded area and cool off; use cold wet towels or ice and fan
    • Drink lots of water; may need IV
    • Loosen clothing and elevate legs above heart
    • If condition worsens, seek medical attention immediately
    If left untreated, heat exhaustion can lead to HEAT STROKE!
  • Heat Stroke
    A medical emergency and life-threatening condition caused by failure of heat-regulating mechanisms of the body due to high heat and humidity. The body’s core temperature rises and stops sweating.
    • Hot, red skin and NO sweating
    • Rapid pulse, confusion and nausea
    • Possible convulsions and unconsciousness
    • Move to a cooler location and loosen clothing
    • Immerse in cool water or wrap in wet sheets
    • Apply cold compresses to head, neck and groin
  • Prevention
    • Drink lots of water (at least 16 ounces per hour), even if not thirsty
    • Start drinking water before you start work
    • Avoid beverages containing alcohol or caffeine
    • Get used to the heat for short periods, followed by longer periods of work
    • Alternate work and rest breaks, with longer breaks in cooler areas
    • Work in teams to limit strenuous activity
  • Prevention (cont.)
    • Ensure adequate ventilation
    • Wear lightweight, loose-fitting, light-colored clothing (e.g. cotton)
    • Notify your Supervisor at first sign of any problem
    • Keep an eye on your coworkers. Use a buddy system.
    • Check your urine color for signs of dehydration
    • In the course of a day's work in the heat, you could sweat as much as 2-3 gallons.
    • Drink an adequate amount of water, even when you are not thirsty.
    • You should drink 16 ounces of fluids every hour to replenish the necessary fluids in the body.
    • By the time you feel thirsty, you are already 10% dehydrated.
    • Urine color gives indication of hydration state (i.e. if urine is dark, drink more water).
  • What to Do When a Worker is Ill from Heat
    • Call a First Responder / Supervisor for help. If they are not available, call 911
    • Have someone stay with the worker until help arrives
    • Move the worker to a cooler / shaded area
    • Remove outer clothing
    • Fan and mist the worker with water; apply ice (ice bags or ice towels)
    • Provide cool drinking water, if able to drink
    IF THE WORKER IS NOT ALERT or seems confused, this may be a heat stroke. CALL 911 IMMEDIATELY and apply ice as soon as possible!
  • Quiz
    Circle the best answer to each statement.
    In the course of a day’s work in heat, a person can sweat as much as 2-3 gallons. True or False
    Heat stress occurs when the core body temperature rises and cannot be cooled by sweating.True or False
    Humidity is not an external factor associated with heat stress.True or False
    Heat rash occurs when sweat ducts plug and sweat cannot freely evaporate from the skin. True or False
    Heat cramps are treated by drinking 16 ounces of water every 4 hours. True or False
    Headaches and dizziness are not symptoms of heat exhaustion. True or False
    Hot, red skin and no sweating are symptoms of heat stroke. True or False
    If someone is having a heat stroke, seek medical attention immediately. True or False
    Applying ice is not recommended for treating someone taken ill from the heat. True or False
    If you are not thirsty, you must be well-hydrated. True or False
    Drinking beverages with caffeine is a good way to prevent dehydration. True or False
    Darker urine color is an indicator of dehydration. True or False