why use sports drinks
DESCRIPTION
Why would a person use sports drinks over water? This presentation compares water and Gatorade to examine the benefits of sports drinks.TRANSCRIPT
Watervs.
Sports Drinks
M. SchwartzWSSD 618
Although the marketing push has increased significantly in the past 5-10 years, the concept of the “sports drink” has been around for a long time.
• Athletes have been formulating their own sports drinks for decades.
• Gatorade was developed in 1965 at The University of Florida.
DID YOU KNOW…
Objectives• Why do we get thirsty?• What is the difference between
water and a sports drink?• What are the fluid guidelines for
athletes?• What drinks should athletes
avoid?
What causes thirst?• Exercise causes an increase in body
temperature
• Sweating is an attempt to cool the body
• A loss of body fluid causes a degree of dehydration
• The brain triggers the thirst response…
• …WE DRINK to replace the lost fluids
SO WHAT?!Continued fluid loss will
eventually cause dehydration
Effects of Dehydration
• Sweating causes a loss of water AND electrolytes
• An athlete will begin to notice decreased performance levels with a sweat loss of just 2% of body weight.
Ex: 150 pound athlete = 3 pounds
Water•Advantage
–It will quench your thirst
•Disadvantage–It will not rehydrate the body
HUH?!?!
Water (continued)
•“Turns off” the thirst mechanism prematurely–Person drinks less water than the body needs
•“Turns on” the kidneys–More urine is produced
The Million-Dollar Question
Why should athletes use sports drinks?
They contain WATER
•The body is between 50% and 70% water.
•WE NEED IT TO SURVIVE!
They have FLAVOR
•Studies have shown that “children and young adults will consume more fluid if they are offered a flavored drink.”
Dr. Michael E. Speer, MD; Chairman, Council on Scientific Affairs
They contain ELECTROLYTES •Restores sodium, potassium
and chloride to the body–needed to maintain water balance outside the cell
–lost through sweat
www.ggsiweb.com
They contain SODIUM
•The small amount of sodium contained in many sports drink helps activate thirst, ensuring you drink until fully rehydrated.
www.ggsiweb.com
They contain CARBOHYDRATES •Provides additional
energy to working muscles during exercise–A 6% carbohydrate content is best absorbed as fast as water
www.ggsiweb.com
Water vs. Sports Drinks
No carbohydrates6-8% carbohydrates = provides added energy
No electrolytes Added electrolytes
Quenches thirst =
less drinking
Sodium added = greater thirst =
more drinking
Stimulates urine production
Absorbed quickly = less urine
No flavor =
less drinking
Flavored =
more drinking
“There are many occasions when Gatorade is more
effective than water, but no occasion when water is
more effective than Gatorade.”
Dean KleinschmidtHead ATC, New Orleans Saints
THE VERDICT?
This is particularly true for…
• Long periods of exercise– Ex. running a marathon, 2-a-day
practices
• Shorter bouts (30+ minutes) of vigorous activity– Ex. tennis, soccer, basketball
Fluid Guidelines for Athletes
Before exercising…
• Drink 17-20 ounces of water or sports drink 2-3 hours before exercising
• Drink 7-10 ounces 20 minutes before exercising
Prentice & Arnheim (based on recommendations from ACSM and NATA)
Fluid Guidelines for Athletes
During exercise…
• Fluid replacement beverages should be readily accessible
• Consume at least 7-10 ounces every 10-20 minutes
Prentice & Arnheim (based on recommendations from ACSM and NATA)
Fluid Guidelines for Athletes
During exercise…
• Consume the maximum amount of fluid you can tolerate
• A cool (50-59°), flavored beverage is recommended
Prentice & Arnheim (based on recommendations from ACSM and NATA)
Fluid Guidelines for AthletesAfter exercise…
• For each pound lost during exercise, consume 20 ounces of fluid–Compensates for additional
sweating and urination–Replaces carbohydrate stores
Fluid Guidelines for AthletesWhat to avoid:
• Fruit juices–Fructose slows absorption
• Carbonated Drinks/Soda–Carbonation causes bloating–High sugar concentration
slows absorption
Fluid Guidelines for AthletesWhat to avoid:
• Caffeine (cola, tea, coffee, etc)–A diuretic, promoting
dehydration• Energy drinks
–More than 8% carb content–May contain Ephedra (Ma
Huang)
The “Not-So-Pop” Quiz• Why is water a poor rehydrator?• Identify two of the four things that
sports drinks have that make them better than water.
• The ideal carbohydrate content for a sports drink is:
• A 3% B 6% C 9% D 12%
• T or F – Sports drinks provide no benefit to an athlete involved in activity for less than 1 hour.
Bibliography"Hydration." Sports Science Library. 2002.
Gatorade Sports Science Institute. 11 May. 2005 <http://www.gssiweb.com/sportssciencecenter/topic.cfm
Prentice, William E., and Daniel D Arnheim. Essentials of Athletic Injury Management. 6th ed. New York: McGraw Hill, 2005.
“Gatorade Research." Sports Science Library. 2002. Gatorade Sports Science Institute. 11 May. 2005 <http://www.gssiweb.com/reflib/refs/548/water_gatorade.cfm
“The End”