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Technical Reference
The Heat Index combines the effects of heat and humidity. When heat and
humidity combine to reduce the amount of evaporation of sweat from the body,
outdoor exercise becomes dangerous even for those in good physical condition.
Key rules for coping with heat are to drink plenty of water to avoid dehydration,
slow down, and cool off when feeling fatigued, headache, a high pulse rate or
shallow breathing. Overheating can cause serious, even life-threatening conditions
such as heat stroke. The Apparent Temperature, which combines the temperature
and relative humidity, is a guide to the danger. Below is the Heat Stress Index
based on the Apparent Temperature.
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The loss of fluid and salt through perspiration and improper replacement
of
them can lead to dizziness and weakness. Body temperature might rise,
but not above 102 degrees. In some cases, victims especially the elderly
should
be hospitalized. Heat exhaustion is more likely to occur after continuous
exposure
to excessive heat waves. The best prevention from heat exhaustion
is to drink
plenty of water and minimize physical activity in the heat. Salt
tablets should not be taken without consulting a physician.
Heat Syncope or Fainting:
Anyone not used to exercising in the heat can experience a quick drop in blood
pressure that can lead to fainting.
easy.