Heat Stress Information


The Heat is on

        The hazards of living and working in South Texas under elevated    
        temperature conditions can range from simply being annoyed by the heat
         - - to a life threatening emergency.

There are ways in which you can beat the heat in order to protect yourself under hot conditions.  You must take precautions to avoid heat stress and you must also know the symptoms and emergency procedures of heat stress so that you may assist a co-worker or a loved-one who is suffering from a heat-related illness.

The following information is an outline of the heat stress training program conducted for Texas A&M University-Kingsville.  If you need more information or would like to schedule a heat stress training program for your department, please contact the EHS Office at extension 2646.


Since 1936, according to the National Safety Council, over 30,000 people have died from heat related illnesses.

The Centers for Disease Control (CDC) report that approximately 400 people die each year from excessive natural heat

This is an average number of deaths associated with normal hot temperatures.  In the event of a heat wave, the number of deaths increase tremendously.

Heat related injuries seem to occur often with the elderly;  people who are not in good physical condition; or acclimatized to the heat.


There are two main ways in which our bodies produce heat:

Man Playing Soccer

Metabolic Heat - the body generates heat through the digestion of food and exercise.

Flaming Happy Sun Cartoon

Environmental Heat - body absorbs heat from the surrounding environment, whether it is the hot sun or a hot room.



There are three methods in which our bodies can be cooled.

Image of an electric oscillating fan

Convection - is the transfer of heat through the circulation of air.


Radiation - heat is naturally emitted from the body surface.


Evaporation - process which occurs when a liquid changes into a vapor.







Acclimation - the biological process through which our bodies adapt to the environment -- basically getting used to the heat.


Air Temperature - heat flows from warmer objects to cooler objects.


Air Movement - moving air speeds the evaporation process.


Humidity - the amount of water vapor in the air affects the rate of evaporation.


Clothing - the type of clothing affects the amount of heat our bodies absorb and retain.



Read the following conditions so that you may be familiar with their symptoms in order to protect yourself and others in the event of a heat related emergency.


Heat Rash - also known as Prickly Heat, occurs in hot, humid environments where sweat can't easily evaporate from the skin.   This condition produces a rash which in some cases causes severe pain.  The procedures to prevent or minimize this condition is to rest frequently  in cool places and bath regularly ensuring to thoroughly dry the skin.


Heat Cramps - painful muscle spasms that result from the loss of salt and electrolytes due to excessive sweating.  The cramps will usually affect the stomach, the arms and legs.  This condition can be treated by drinking fluids containing electrolytes such as calcium, sodium and potassium.  This condition usually precedes heat exhaustion.


Heat Exhaustion - is a state brought on by the loss of fluids lost during excessive sweating.  Individuals with heat exhaustion still sweat, but they experience extreme weakness and may even collapse.  They may experience nausea and headache.  Their skin is clammy and moist, their complexion is usually pale and the body temperature is usually normal or slightly higher.  This condition is best treated by taking the patient to a cool place, applying cool compresses, elevating the feet and giving the individual plenty of fluids.


Heat Stroke - is a severe medical emergency which could result in death.  Heat stroke results when the body's core temperature gets too high and the body is no longer able to cool itself.  An individual suffering from heat stroke will have hot and dry skin, their pulse will be high and their blood pressure will fall.  The person may have irrational behavior, may be in a state of confusion or may become comatose.  The body core temperature may exceed 104 degrees F.   If not treated promptly the core temperature will rise too high and death will follow.  This condition must be treated by immediately cooling the victim's body with water or wrapping them in cool wet  sheets.  Immediately seek medical attention.



There are means to preventing heat emergencies.  Familiarize yourself with the following procedures to ensure that you or those around you do not become a statistic to heat stress.

Acclimation - accustom yourself to the weather prior to long durations of physical activity.


Cold Drink

Maintain Body Fluids - Fluid intake must be maintained throughout the course of physical activity. Do not rely on thirst as an indicator of dehydration because your body loses water faster than you realize. Alcohol should be avoided because it is a diuretic, which increases dehydration and can interfere with heat loss.


Proper Diet – Eat light and stay away from heavy foods. They increase metabolic heat production and also increase water loss. Eat smaller, well-balanced meals more often.

White ShirtDress Light – Lightweight, light-colored clothing reflects heat and sunlight and helps your body maintain normal temperatures. Wear loose-fitting clothes such as cotton which lets air move over your body. Wide brimmed hats should also be worn.


Rest Periods - Pace your work activities at a slower rate during high temperatures and take frequent rest periods in a shaded area and drink plenty of fluids.




The following Heat Index Chart is for your information which shows how hot it really feels when the humidity is combined with the actual air temperature.

Heat Index Chart


Procedures Chart


Information obtained from National Weather Service and USAF

This page was last updated on: January 6, 2017