must be exposed to hot environments and provide necessary work-rest cycles and water to minimize heat stress.

Special Considerations during Prolonged Heat Spells:

During unusually hot weather conditions lasting longer than 2 days, the number of heat illnesses usually increases. This is due to several factors, such as progressive body fluid deficit, loss of appetite (and possible salt deficit), buildup of heat in living and work areas, and breakdown of air-conditioning equipment. Therefore, it is advisable to make a special effort to adhere rigorously to the above preventive measures during these extended hot spells and to avoid any unnecessary or unusual stressful activity. Sufficient sleep and good nutrition are important for maintaining a high level of heat tolerance. Workers who may be at a greater risk of heat illnesses are the obese, the chronically ill, and older individuals.

When feasible, the most stressful tasks should be performed during the cooler parts of the day (early morning or at night). Double shifts and overtime should be avoided whenever possible. Rest periods should be extended to alleviate the increase in the body heat load.

The consumption of alcoholic beverages during prolonged periods of heat can cause

additional dehydration. Persons taking certain medications (e.g., medications for blood

pressure control, diuretics, or water pills) should consult their physicians in order to

determine if any side effects could occur during excessive heat exposure. Daily fluid

intake must be sufficient to prevent significant weight loss during the workday and over

the workweek