Technical Reference
Technical Reference | 3 |
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3.1 Getting to know Heat Index
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
based on the Apparent Temperature.
Apparent Temperature Heat Stress Index
Category | Apparent | Dangers | |
| Temperature |
| |
Care | Exercise more fatiguing than usual | ||
Ultra Care | Heat cramps, exhaustion possible | ||
Danger | Heat exhaustion likely | ||
Ultra Danger | Greater than | Heat stroke imminent | |
130°F | |||
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Effects of Heat Illnesses
Heat Cramps:
Exercising in hot weather can lead to muscle cramps, especially in the legs, because of brief imbalances in body salts. Cramps become less frequent as a person becomes used to the heat. As with heat cramps, the cure is to take it easy.
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.
Heat Exhaustion:
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.
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