H20 moze zabic!
- From: "Adam R. Tomaszewski" <artomaszewski@xxxxxxxxxxxxx>
- Date: Sun, 17 Jun 2007 07:17:32 -0400
LiveScience Staff
LiveScience.com Sat Jun 16, 3:00 PM ET
Health experts cautioned yesterday that some endurance athletes drink too
much water during exercise and are at risk of deadly "water intoxication."
Marathon runners, triathletes and cyclists are familiar with dehydration,
caused by not drinking enough. But fewer are aware that too much water can
kill.
Water intoxication is formally called exercise-induced hyponatremia (EAH).
One recent study found that 13 percent of Boston marathon runners suffered
from EAH, though most cases were mild. But since 1985, there have been at
least eight documented fatalities from EAH related to long-distance events.
The disorder occurs when endurance exercisers drink more fluid-water or
sports drinks-than their kidneys can excrete. Excess water can dangerously
dilute the level of sodium in the blood needed for organs to function.
"The public's impression of the amount of water that is necessary to drink
for good health is not based on real factual data," said Dr. Joseph Verbalis
at Georgetown University Medical Center. "Many in our society have promoted
the idea that you need to continually drink a large amount of fluid, such as
8 ounces of water eight times a day. But most people don't really need that
much."
Verbalis and colleagues wrote about the the causes of this disorder in the
May issue of Sports Medicine and released a statement yesterday.
EAH "could be prevented if only people would respect their personal thirst
'meter,' or would undertake a 'sweat test' to determine how much water they
actually need to drink in order to replace just the body fluids lost during
exercising," the researchers stated.
EAH mostly afflicts people participating in events for 4 hours or more. "The
average person who goes out for an hour or two of strenuous exercise is not
going to be at risk for this," Verbalis said.
The issue remains conterversial, however. Some trainers and sports
physiologists contend that by the time you're actually thirsty, you have
lost enough fluid to already be dehydrated, so they say you need to drink in
anticipation of becoming dehydrated, Verbalis explained. "We dispute that
notion," he said, "and contend that thirst is a good indicator of your body's
need for fluids, and that there is a window of time over which you can
rehydrate safely."
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a.. Original Story: Endurance Athletes Risk Deadly 'Water Intoxication'
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