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APP/SSHP <br /> Soil Excavation at California National Guard Armory <br /> Lodi, California <br /> 8.0 HEAT/COLD STRESS MONITORING <br /> 8.1 HEAT STRESS <br /> This section on Heat Stress includes information taken from the Mayo Clinic First Aid guide <br /> accessed at www.MavoClinic.com. <br /> Your body's heat combined with environmental heat results in what's called your core <br /> temperature—your body's internal temperature. Your body needs to regulate the heat gain <br /> (and in cold weather, heat loss) from the environment to maintain a core temperature that's <br /> normal, approximately 98.6 F (37 C). When the body temperature rises, the body seeks to <br /> dissipate the excess heat. When the body is unable to regulate this core temperature, several <br /> heat-induced illnesses such as heat cramps, heat exhaustion and heat stroke can occur. A <br /> discussion of the symptoms and treatment for each are listed below: <br /> In general, factors leading to heat stress include: <br /> • High temperature and humidity; <br /> • Physical exertion; <br /> • Limited air movement; <br /> • Some medicines; <br /> • Inadequate tolerance for hot workplaces; <br /> • Poor physical condition; and <br /> • Direct sun or heat. <br /> The SSHO is designated to evaluate site workers for potential heat stress illness. All workers <br /> should watch out for each other. If a coworker complains of feeling ill or shows signs of heat <br /> stress, it should be brought to the attention of the SSHO. <br /> 8.1.1 Heat Cramps <br /> Heat cramps are painful spasms that may occur in the muscles of workers who have perspired <br /> profusely in the heat. Muscles most often affected include those of your calves, arms, <br /> abdominal wall and back, although heat cramps may involve any muscle group involved in <br /> exercise. <br /> If you suspect heat cramps: <br /> • Rest briefly and cool down <br /> • Drink water or a diluted electrolyte-containing sports drink <br /> • Practice gentle, range-of-motion stretching and gentle massage of the affected muscle <br /> group <br /> Prompt treatment usually prevents heat cramps from progressing to heat exhaustion. <br /> 8.1.2 Heat Exhaustion <br /> Causes of heat exhaustion include exposure to high temperatures, particularly when combined <br /> with high humidity, and strenuous physical activity. Without prompt treatment, heat exhaustion <br /> can progress to heatstroke, a life-threatening condition. <br /> OTI E 25 <br />