As a heat wave spreads across the country, the August edition of The Safety Zone focuses on summer’s potential hazards for outdoor workers and provides tips for treating and managing their effects.

Risk of Heat-Related Illnesses

The combination of heat and humidity can be a serious health threat during the summer months and working outdoors puts workers at risk for heat-related illnesses. Workers are at an increased risk for heat-related illnesses when they:
use improper work methods;
are not accustomed to hot temperatures or high humidity;
are over the age of forty;
are in poor physical condition or overweight;
use certain medications, such as antihistamines, diuretics, and some tranquilizers;
have had prior heat-related illnesses;
use drugs or alcohol within 24 hours prior to working in the heat;
have heat rash or sunburn; or
wear restrictive or too much clothing.
Heat Exhaustion

Heat exhaustion is a mild form of heat-related illness that can develop after several days of exposure to high temperatures and inadequate or unbalanced replacement of fluids. Those most prone to heat exhaustion are elderly workers, workers with high blood pressure and workers working in hot environments. Heat exhaustion warning signs include:
heavy sweating;
paleness;
muscle cramps;
tiredness;
weakness;
dizziness;
headache;
nausea or vomiting; and/or
fainting.

Cooling measures that may be effective include:
cool, nonalcoholic beverages;
rest;
cool shower, bath, or sponge bath;
lightweight clothing.
Heat Stroke

Heat stroke occurs when the body is unable to regulate its temperature. The body’s temperature rises rapidly, the sweating mechanism fails and the body is unable to cool down. Heat stroke can cause death or permanent disability if emergency treatment is not provided immediately. Warning signs of heat stroke vary, but may include the following:
an extremely high body temperature (above 103°F, orally);
red, hot and dry skin (no sweating);
rapid, strong pulse;
throbbing headache;
dizziness;
nausea; and
unconsciousness.

If a worker shows signs of heat stroke have someone call for immediate medical assistance and cool down the victim. Do the following:
Get the victim to a shaded area.
Get medical assistance as soon as possible.
Cool the victim using whatever methods are available, for example, immerse the victim in a tub of cool water; place the victim in a cool shower; spray the victim with cool water from a garden hose; sponge the victim with cool water; or if the humidity is low, wrap the victim in a cool, wet sheet and fan him or her vigorously.
Monitor body temperature, and continue cooling efforts until the body temperature drops to 101°-102°F.
If emergency personnel are delayed call 911 for further instructions.
Do not give the victim alcohol to drink.