Heat stress


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Heat stress

  1. 1. Heat StressI told you to bring water, you dummy! Turn the AC on.
  2. 2. Heat Stress
  3. 3. Heat Stress Types of Heat Transfer• Conduction.• Convection.• Radiation.• Evaporation.
  4. 4. Heat Stress
  5. 5. Heat StressConvection
  6. 6. Heat StressRadiation
  7. 7. Heat StressEvaporation Cooling
  8. 8. Heat Stress Normal Body Cooling• The average 160 lb. adult has approx. 10 pints (5 quarts) of blood and approx. 60,000 miles of plumbing.• When the body core temperature rises, blood is pumped to the skin to dissipate heat.• The skin is the largest organ of the body.• Sweating increases (evap cooling).• Heart rate increases to speed up the flow of blood to the skin.
  9. 9. Heat Stress• If everything is working correctly, the excess heat will dissipate and the core temp. will drop and stabilize.• Primary cooling of the body is by radiation.• Secondary is by evaporation (sweating).
  10. 10. Heat Stress Types of Heat Related Stress• Transient Heat Stress• Heat Rash (Prickley Heat)• Heat Cramps• Heat Exhaustion• Heat Stroke
  11. 11. Heat StressAcclamation
  12. 12. Heat Stress Risk Factors Risk Factors• Age- young children • Use of illegal drugs. and the elderly. • Prescription meds.• Over age 40. • Use of alcohol.• Overweight or obese. • Caffeinated drinks.• Poor physical • High blood pressure. condition. • Kidney, liver problems• Coronary problems. • Respiratory problems.
  13. 13. Heat Stress Risk Factors• Previous heat illness.• Diabetes.• Pregnancy.• Fever.• Sleep deprivation.• Low salt diet.• Poor diet
  14. 14. Heat Stress FIRST AID• Transient Heat Stress a. Training and acclamation.• Heat Rash (Prickly Heat) a. Keep affected area clean, dry, use medicated powder.
  15. 15. Heat Stress FIRST AID• Heat Cramps Symptoms – Cramping of large muscles during or after exertion. First Aid: a. Stop and rest in cool area. b. Drink cool water or sports drink.
  16. 16. Heat Stress First Aid• Heat Exhaustion Symptoms – Fatigue, weakness, dizziness, faint, nausea, headache, cool moist skin, normal or slightly elevated temperature, rapid pulse, pale or flushed skin.First Aid: a. Move victim to cool area, rest, sip cool water or sports drink, sponge or cool shower. Seek medical assistance.
  17. 17. Heat Stress First Aid• Heat Stroke Symptoms – Hot dry skin, skin is flushed, red or bluish, confusion, rapid pulse, convulsions, elevated temperature, unconsciousness. May be fatal. May suffer permanent damage to brain, heart, lungs, muscles, liver and/or kidneys.First Aid: CALL911 This is a medical emergency. a. Remove victim to cool location. b. Remove clothing, sponge, hose, immerse. c. Do not give fluids, they won’t keep it down.
  18. 18. Heat Stress• Once the body core is overheated, it takes a minimum of 30 minutes to cool and stabilize.• Heat is a stressor that increases strain, accelerates fatigue and increases the possibility of an accident.• Heat stress is preventable through training.• Approximately 29 people die from heat related stress in Arizona every year.
  19. 19. Heat Stress Water Intoxication• Abnormally low concentration of sodium in the blood.• Drinking too much water.• Symptoms the same as heat exhaustion and heat stroke.• Disrupts electrical signals in the brain and nervous system.• Can be fatal due to swelling of the brain.• Mostly occurs in endurance athletes and marathon runners.
  20. 20. Heat StressQuestions????It’s a dry heat, ya, right!