Heat StressHeat Stress

I told you to bring water, you dummy! Turn the AC on.

Heat StressHeat Stress

Heat StressHeat Stress

Types of Heat Transfer

• Conduction.

• Convection.

• Radiation.

• Evaporation.

Heat StressHeat Stress

Heat StressHeat StressConvection

Heat StressHeat StressRadiation

Heat StressHeat StressEvaporation Cooling

Heat StressHeat StressNormal 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.

Heat StressHeat 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).

Heat StressHeat StressTypes of Heat Related Stress

• Transient Heat Stress

• Heat Rash (Prickley Heat)

• Heat Cramps

• Heat Exhaustion

• Heat Stroke

Heat StressHeat StressAcclamation

Heat StressHeat Stress

Risk Factors• Age- young children

and the elderly.• Over age 40.• Overweight or obese.• Poor physical

condition.• Coronary problems.

Risk Factors• Use of illegal drugs.• Prescription meds.• Use of alcohol.• Caffeinated drinks.• High blood pressure.• Kidney, liver problems• Respiratory problems.

Heat StressHeat StressRisk Factors

• Previous heat illness.• Diabetes.• Pregnancy.• Fever.• Sleep deprivation.• Low salt diet.• Poor diet

Heat StressHeat Stress

FIRST AID

• Transient Heat Stress a. Training and acclamation.

• Heat Rash (Prickly Heat)

a. Keep affected area clean, dry, use

medicated powder.

Heat StressHeat StressFIRST 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.

Heat StressHeat StressFirst Aid

• Heat ExhaustionSymptoms – 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.

Heat StressHeat StressFirst Aid

• Heat StrokeSymptoms – 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.

Heat StressHeat 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.

Heat StressHeat StressWater 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.

Heat StressHeat StressQuestions????

It’s a dry heat, ya, right!