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Safety
Body fluid helps control the temperature of working muscles and vital organs.
This process is negatively affected by dehydration, putting you at risk for:
- Cramps
- Dizziness/
- Lightheadedness
- Heat Exhaustion
- Heat Stroke
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Performance
Losing only 2% of your body weight through sweating (as little as 3 pounds
if you weigh 150 pounds) affects:
- Performance
- Mental functioning
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Sweating
Sweating is beneficial and aids evaporative cooling-but sweating leads
to dehydration
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Not Drinking Enough Fluids
If fluids are not replaced before, during and after practices and games, you
will become dehydrated |
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Watch for the warning signs:
- Headache
- Dizziness/Lightheadedness
- Weakness
- Irritability
- Early Fatigue
- Muscle cramps
Remember, thirst is not a good indicator of hydration. If you’re thirsty, chances are you’re already dehydrated. |
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Drink to replace the fluids you lose in sweat, not more.
Overdrinking can be dangerous, even deadly.
- Weigh yourself before and after competition and replace what you lose
- Drink two to three cups (16-24 ounces) of fluid for every pound lost in sweat.
- Drink fluids throughout the day and use fluid breaks during practices.
Check urine color:
- Darker like apple juice signals you need more fluids
- Pale like lemonade means you’re hydrated
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Heat-Induced Muscle Cramps
Causes:
- Dehydration
- Large salt loss
- High intensity exercise
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Treatment:
Staying properly hydrated and eating enough salt in your diet
(Forget the bananas. Sodium,
not potassium,
is the key to preventing cramps).
This can be done by eating foods with sodium
such as pretzels, crackers
and canned soups or drinking Gatorade.
Other ways to prevent cramps:
- Stay in shape
- Gradually get used to working out in heat and humidity by slowly increasing the intensity
of your workouts
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Heat Exhaustion
Symptoms:
- Unusual weakness
and fatigue
- Rapid pulse
- Headache
- Weakness
- Nausea or vomiting
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Treatment:
- Pack ice to the trunk, neck, and limbs
- Drink fluids
- Loosen or remove clothing and equipment
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Heat Stroke: A Life Threatening Emergency
Symptoms:
- Dangerously high temperature
- Confusion or disorientation
- Irrational behavior
- Drowsiness
- Nausea
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Treatment:
- Immediate cold water or ice immersion
- Transport to hospital
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- Get acclimated to the heat:
- Keep fit in the off-season
- Exercise in the heat for 10 to 14 days
-- Start with short, low-intensity practices, wearing minimal clothing
-- Gradually increase duration, intensity, clothing and equipment
- Drink up
- Keep cool
- Limit use of full gear when heat and humidity rise
- Tell your coaches and athletic trainers if you’re taking any medication or dietary supplements
- Speak up if you don’t feel well. Don’t let your pride hurt you.
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Science tells us you should stay
away from:
- Carbonated beverages
- Carbonation can cause fluids to empty from your stomach slower,
causing pain, stomach cramping, discomfort or nausea
- Fruit juice
- Energy drinks
- Protein supplements
- Herbs
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Ryan, et al. Applied Physiol, 1992.
Davis, et al. Int J Sports Med, 1999
Maughan and Murray. Sports Drinks:
Basic and practical aspects. 2001.
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Water is good, but a sports drink is better:
- Sports drinks have electrolytes and carbohydrates that can help benefit performance
- Water shuts down thirst before you’ve replaced the fluid you lost through
sweat
- Sports drinks have flavor so you’ll drink more
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Below, et al. Med Sci Sports Exerc, 1995.
Smith, et al. J Sports Sci, 1998.
Passe, et al. Appetite, 2000.
Wilk and Bar-or. Applied Physiol, 1996. |
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When sports drinks are better than water:
- During any sweaty exercise
- During training that occurs multiple times throughout the day
- When regular meals are not available
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Casa, et al. J Athlet Train. 2000. |
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Sodium:
- Helps maintain fluid balance
- Activates your thirst mechanism so you drink more
- Decreases the risk of muscle cramps
- Most importantly, it helps maintain fluid homeostasis
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Carbohydrates:
- Provides muscle energy
- Improves physical performance
- Maintains mental function
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Taste:
- Increases voluntary fluid intake because
you’ll drink more of something you like
- Allows for more effective rehydration
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