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From the Indiana State Department of Health and the CDC
Experts say these are the best ways to endure humidity and avoid the danger of heat exhaustion and heat stroke:
Pace yourself: for work or recreation in the sun, be sure to take frequent breaks to take on fluids and cool off out of the heat
Take it easy: put off strenuous activities that can wait until weather cools
Stay cool: use air-conditioning, if it's available; if it's not available, take cool baths, showers, or sponge baths and temporarily inhabit dry basement spaces, which can be 10-15 degrees cooler
Eat lighter meals: avoid use of your stove by eating more salads, fresh vegetables and fruit
Dress appropriately: wear light-colored, lightweight cotton clothing, which readily releases perspiration and reflects heat. Cotton absorbs perspiration better and thus cools better than synthetics
Drink fluids: drink plenty of cool, non-alcoholic beverages (water is best), especially when you're outdoors, to keep the body's cooling system operating efficiently; avoid alcohol, which can induce dehydration
Stay in the shade: if possible, perform work or strenuous recreational activities outdoors in the morning or early evening, when the sun's heat is less intense; avoid sun burn and ultraviolet light poisoning
Carry water: when you're away from home, keep water in non-breakable bottles with you to easily replenish fluids lost to perspiration
Look after the very young and the aged: babies and older adults are more susceptible to heat induced illness; check on them regularly, call your local health department for instructions if you are unsure
Heat Exhaustion: heavy sweating, paleness, tiredness, headache, weakness, dizziness, nausea, vomiting, fainting
Heat Stroke: Extremely high body temperature (above 103 degrees), red, hot and dry skin (no sweating), rapid strong pulse, throbbing headache, dizziness, nausea, confusion, unconsciousness
PROVIDE TREATMENT
Heat Stroke: The symptoms above could indicate a life-threatening emergency.
First, call for immediate medical assistance, then:
Heat Exhaustion: Although this is not as serious as heat stroke, seek medical help for severe cases