HEAT EXHAUSTION

TYPES

There are two types of heat exhaustion:

1. Water depletion. Signs include excessive thirst, weakness, headache, and loss of consciousness.
2. Salt depletion. Signs include nausea and vomiting, muscle cramps, and dizziness.

Although heat exhaustion isn’t as serious as heat stroke, it isn’t something to be taken lightly. Without proper intervention, heat exhaustion can progress to heat stroke, which can damage the brain and other vital organs, and even cause death.

SYMPTOMS

The most common signs and symptoms of heat exhaustion include:

• Confusion
• Dark-colored urine (a sign of dehydration)
• Dizziness
• Fainting
• Fatigue
• Headache
• Muscle or abdominal cramps
• Nausea, vomiting, or diarrhea
• Pale skin
• Profuse sweating
• Rapid heartbeat

TREATMENT

If you, or anyone else, has symptoms of heat exhaustion, it’s essential to immediately get out of the heat and rest, preferably in an air-conditioned room. If you can’t get inside, try to find the nearest cool and shady place.

Other recommended strategies include:

• Drink plenty of fluid (avoid caffeine and alcohol).
• Remove any tight or unnecessary clothing.
• Take a cool shower, bath, or sponge bath.
• Apply other cooling measures such as fans or ice towels.

If such measures fail to provide relief within 15 minutes, seek emergency medical help, because untreated heat exhaustion can progress to heat stroke.

After you’ve recovered from heat exhaustion, you’ll probably be more sensitive to high temperatures during the following week. So it’s best to avoid hot weather and heavy exercise until your doctor tells you that it’s safe to resume your normal activities.

PREVENTION

When the heat index is high, it’s best to stay inside in air conditioning. If you must go outdoors, you can prevent heat exhaustion by taking these steps:

• Wear lightweight, light-colored, loose-fitting clothing, and a wide-brimmed hat.
• Use a sunscreen with an SPF of 30 or more.
• Drink extra fluids. To prevent dehydration, drink plenty of water, fruit juice, or vegetable juice per day. Because heat-related illness also can result from salt depletion, it may be advisable to substitute an electrolyte-rich sports drink for water during periods of extreme heat and humidity. Ask your doctor about the best types of fluid and how much you should be drinking.
• A general recommendation for those doing moderate- to high-intensity exercise is to drink 17 to 20 ounces of fluid two to three hours before exercise, and consider adding another eight ounces of water or sports drink right before exercise. During exercise, you should consume another seven to ten ounces of water every 20 minutes, even if you don’t feel thirsty. Also, drink another 8 ounces within a half hour after exercise. Take additional precautions when exercising or working outdoors.
• Avoid fluids containing either caffeine or alcohol, because both substances can make you lose more fluids and worsen heat exhaustion. If you have epilepsy or heart, kidney, or liver disease, are on a fluid-restricted diet, or have a problem with fluid retention, check with your doctor before increasing liquid intake.