Hydration
becomes an issue under several circumstances. Here are a few
things to keep in mind.
Hydration is important when...
- Temps are high.
- Exercise continues for more than 60 minutes.
- Activity is repeated more than once a day.
- Activity is repeated several days in a row. (Soccer Camp)
- Athlete has been sick prior to activity.
Hydration can not happen minutes before the activity and
effective hydration starts up to 72 hours before the activity.
"Catching up" is very hard to due.
Proper hydration
is helpful for achieving the best performance in elite athletes.
Adequate fluid intake is also helpful for recreational
exercisers to exercise at their best. There have been
recommendations about how much water or sports drinks are needed
and over the years athletes were advised to drink much more
water than we now know is necessary. New guidelines on nutrient
recommendations were published by the Institute of Medicine of
the National Academies. They state that the vast majority of
healthy people adequately meet their daily hydration needs by
letting thirst be their guide. They don't provide specifics,
such as the number of glasses of water per day, because fluid
needs can be met through a variety of sources besides drinking
water alone.
The group makes special recommendations for athletes in the area
of water, sodium and potassium.
The International Marathon Medical Director's Association also
revised guidelines regarding hydration for athletes in May 2006.
They recommend drinking a sports drink when exercising thirty
minutes or more. They also state that during a marathon, it's
best if runners listen to they body and drink when they feel
they need to.
Hyponatremia, or water intoxication, was the result of this
"drink, drink, drink" mantra, and now recommendations are going
the other way, "Drink Less." For many exercisers water
intoxication is a very real and very serious complication from
drinking too much water. The numbers of triathlon and marathon
participants who develop symptoms of water intoxication,
continue to grow as more and more novice exercisers have entered
these events.
So what is the right amount of fluid to drink? Well, that all
depends, and in fact, it may not be that important to try to
figure it out.
The longer and more intensely you exercise, the more important
it is to replace lost fluids. And for an elite athlete, a loss
of two percent of body weight in fluid has been linked to a drop
in blood volume. This makes the heart work harder in order to
move blood through the bloodstream. For elite athletes this
decrease can result in a slight decrease in performance.
Dehydration in athletes may also lead to fatigue, poor
performance, decreased coordination and muscle cramping. The
American College Of Sports Medicine provides guidelines for
athletes regarding proper hydration and fluid replacement.
Hydration Guidelines
If you feel that you need some sort of guideline to determine
how much you should be drinking, use the following as a starting
point.
Drink no more than 1 cup of water every twenty minutes. You can
also weight yourself before and after you exercise to get a
sense of how much fluid you typically lose. One pound is
equivalent to approximately 24 ounces of fluid.
Sports Drinks
Sports drinks can be helpful to athletes who are exercising at a
high intensity for 60-90 minutes or more. It's necessary to
replace losses of sodium, potassium and other electrolytes
during exercise. Keep in mind that under normal situations most
exercisers are unlikely to deplete these minerals during regular
training. If, however, you find yourself exercising in extreme
conditions or for long times (an Ironman or ultramarathon)
consider adding a sports drink with electrolytes.
Hyponatremia (low blood sodium concentration) may occur during
longer events when athletes drink excessive amounts of plain
water.
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