the science of sports nutrition - bswhealth · moore dr et al., am j. clin nutr 89: 161, 2009 •...
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The Science of Sports Nutrition
Meridan ZernerM.S., R.D.,C.S.S.D., L.D.
Cooper Clinic
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ObjectivesObjectives
1 Learn the basics of sports nutrition and how1. Learn the basics of sports nutrition and how to communicate that information to players/teams for better performanceplayers/teams for better performance
2. Understand the recommendations for h d i f li d f lihydration, fueling and refueling
3. Review the latest science on supplementation ppand ergogenic aids as they relate to sport and performancep
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Cooper Landmark StudyCooper Landmark Study
*Exercise is defined as moderate physical activity. Journal of the American Medical Association, 1989
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Performance StrategyPerformance Strategy
Sports NutritionSports Nutrition
SleepSleepTrainingTraining
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Goals for TrainingGoals for Training
• Maintain desirable/competitive weight• Maintain desirable/competitive weight• Provide adequate fluids, nutrients and
l lelectrolytes• Promote muscle development and
endurance• Avoid fatigueg
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Factors Affecting PerformanceFactors Affecting Performance
• Environment (climate altitude pollution)Environment (climate, altitude, pollution)• State of health
l f fi• Level of fitness• Physical conditioning• Sleep• Diet!Diet!
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Water (<60 90 minutes of play)Water (<60-90 minutes of play)
• Nutrient most neglected by athletesNutrient most neglected by athletes• A loss of 2% of body weight can impair
functionfunction• Thirst is not a reliable stimulus for fluid
d !needs!
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WaterWater• Adverse effects of dehydrationAdverse effects of dehydration
– blood volume • cardiac stroke volume; increased heart rate• competition between muscles and skin for available
water• reduced muscle strength and endurance• reduced muscle strength and endurance• decreased sweat rate; impaired temperature
regulation• heat cramps, heat exhaustion, heat stroke, coma,
death
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Choosing a Sports Drink (> 60-90 minutes of play)
• An optimal sports drink should provide:An optimal sports drink should provide:– a mix of CHO (sucrose, glucose, fructose)
4 8% CHO (9 19 grams per 8 ounces)– 4-8% CHO (9-19 grams per 8 ounces)– sodium (most amounts in drinks are low)
l t bl– palatable
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Going Nuts Over Coconut WaterGoing Nuts Over Coconut Water
• Coconut water is the clear liquid found inside the coconut1 f t t h 46• 1 cup of coconut water has 46 calories, 600 mg of potassium, 252 mg of sodium, 2.6 g of fiber
• Although not a cure all, coconut water is a naturalcoconut water is a natural rehydration drink
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Fluid Replacement Fluid Replacement Recommendations
• Before exercise -– well hydrated during previous 24 hours– well hydrated during previous 24 hours– about 14-22 ounces (approx. 2-3 cups) 2-3
hours before exercisehours before exercise– Practical test: look at color and volume of
urine (should be light-colored, without a strongurine (should be light colored, without a strong odor)
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Fluid Replacement Fluid Replacement Recommendations
• During exercise• During exercise– match fluid intake to sweat output– 4-6 ounces every 15-20 minutes– begin at start of exerciseg
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Fluid Replacement Fluid Replacement Recommendations
• After exerciseWeigh in– Weigh-in
• for every pound lost, drink 16-24 ounces (2-3 cups) of fluid
– Fastest rehydration is achieved with ingestion of adequate intake of water and sodium qchloride
– Forego alcoholic and caffeinated beverages
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Photo: MSN/Encarta
First fluids, then FOOD!!!
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Bottom Line?Bottom Line?
(Q lit )(Quality)
CALORIESCOUNT!!E b l fEat a balance of
carbohydrates,protein,protein,
andhealthy fats
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Calorie DistributionCalorie Distribution
Fig. 8-4, p. 254
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Fruits
Non-starch Vegetables
Lean protein(ex. meat, fish, or poultry, b /l )beans/legumes)
Starches/Starchy Vegetables
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Carbohydrates = ENERGYCarbohydrates = ENERGY
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Carbohydrate SourcesCarbohydrate Sources
• Starch/grains group 15 grams/servingg g p g g
• Milk group 12 grams/serving
• Fruit group 15 grams/serving
• Vegetable group 5 grams/servingVegetable group 5 grams/serving
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CarbohydratesCarbohydrates
• Should comprise approximately 55-60% ofShould comprise approximately 55-60% of total daily calories
• About 3 to 4.5 grams of CHO per pound ofAbout 3 to 4.5 grams of CHO per pound of body weight
• Eating enough CHO before and after an g gevent/training helps maximize glycogen storage in muscles and liver
• Eating CHO during event can delay the use of glycogen (e.g., “glycogen-sparing”)
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CarbohydratesCarbohydrates
Before an EventBefore an Event• CHO “loading”
f ti t th t l t l th 90 i t (– for continuous events that last longer than 90 minutes (e.g., marathon, triathalon)
– Days 2-3 before an event - exercise at low intensity for 20 y yminutes; eat 4.5 grams CHO per pound body weight
– Day 1 before – minimal exercise; eat 4.5 grams CHO per d b d i htpound body weight
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CarbohydratesCarbohydrates
Carbohydrate “loading”Carbohydrate loading for a 150 lb. athlete
150 x 4 5 g/lb = 675 grams150 x 4.5 g/lb = 675 grams
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CarbohydratesCarbohydrates
Before an EventBefore an Event• Pre-event meal
3 t 4 h b f– 3 to 4 hours before – high in CHO (“top off the glycogen tank”)– moderate in protein– low in fat and fiber– experiment before the event
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Carbohydrate-Rich Foods Carbohydrate Rich Foods (Strive for 45)
Food Carb (grams)(g )Whole wheat bagel (large) 60Pasta/rice (1 cup cooked) 43( p )Shredded wheat cereal 34Baked potato with skin 31pBread (2 slices) 30Gatorade (16 ounces) 281 medium banana 251 cup FF milk 12
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Foods With 25 to 30g CarbFoods With 25 to 30g Carb
• 1 cup of juice or 1 large piece of fruitp j g p• 1 bagel or 2 slices of bread• 1 cup of most cereals• 2 cups of milk• 2 cups of milk• ⅔ cup of dried beans• 1 cup of rice or corn• 2 cups of commercial sports/electrolyte replacement drink• ½ to 1 energy bar (1 bar ≅ 25 to 45 g carbohydrate)• 1 pack of energy gel (≅ 25 g carbohydrate)p gy g ( g y )
Atkinson FS, et al. Diabetes Care. 2009;31(12):2281-2283.
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Energy BarsEnergy Bars• Performance bars
– High CHO bars (at least 30-45 g) best eaten 45 – 60 minutes before aerobic exercise.
– Ex: Clif Bar, Odwalla Bar, PowerBar.
• Snack bars– Fewer CHO and calories, but good alternative.– Ex: Luna Bar, Pria Bar, Nature Valley granola bar, Balance Bar, Clif
Mojo Bar.
• Meal replacement bars– Calorie range 300 – 400 and greater than 15 g high quality protein.– Ex: MetRX Big 100, Protein 21, PowerBar ProteinPlus.
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Popular Gels for use during competitions or g p
longer endurance workouts
Name oz Kcal CHO(g)
Sodium (mg)
Potassium(mg)
Protein(g)
Carboom 1.4 107 27 50 50 0
GuGel 1.1 100 25 20 N/A 0
Accel Gel 1.4 90 20 N/A N/A 5
Clif Shot 1 1 100 25 N/A N/A 0Clif Shot 1.1 100 25 N/A N/A 0
Power Gel 1.4 110 28 N/A N/A 0
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For best results with these products
• Consume gel gradually if possible. Ingesting large amounts of concentrated CHO at once can lead to GI discomfort.
• Drink water when consuming gels to help digestion• Drink water when consuming gels to help digestion.
• Use a variety of gels during training to ensure t ltolerance.
• Avoid using products during competitions that were g p g pnot used in training. Competition is not the time to be experimenting.
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CarbohydratesCarbohydrates
During ExerciseDuring Exercise– enhances endurance by increasing blood glucose
(rely less on stored glycogen)(rely less on stored glycogen)– 30-60 grams (120-240 kcal) per hour– can be in form of liquid or solid– can be in form of liquid or solid– experiment with different methods before event
fructose ingestion increases gastric distress– fructose ingestion increases gastric distress
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CarbohydratesCarbohydrates
After Exercise• Consume immediately after event to optimizeConsume immediately after event to optimize
glycogen repleneshment– within 30 minutes strive for .7 grams per poundg p p– every 2 hours after (for 4-6 hours) strive for an additional
.7 grams per pound
• Starch or sugars PLUS protein (3:1 ratio)
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Exercise Metabolic Window
100
80
60PotentialAnabolic 60
20
AnabolicEffect
(percent) 40
20
00 15 30 45 60 75 90 120
MinutesWithout nutrient intervention, the metabolic window begins to close within forty-five minutes following exercisewithin forty-five minutes following exercise.
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ProteinProtein
i d i• Not a primary energy source during exercise
• 10 - 20% of daily calories (depends on total energy intake)energy intake)
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P i SProtein Sources
• Milk group 8 grams/servingMilk group 8 grams/serving
• Meat, Poultry, Fish 7 grams/ounce
• Grains/starch group 3 grams/serving
• Vegetable group 2 grams/serving• Vegetable group 2 grams/serving
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Protein (Goal: 20-30g at a time)Protein (Goal: 20 30g at a time)
• Approximate Protein RequirementsApproximate Protein Requirements– Sedentary 0.4 g per pound– Endurance athlete 0 5-0 6 g per poundEndurance athlete 0.5-0.6 g per pound– Strength athlete 0.8 g per pound
Example:150 pound weight lifter150 pound weight lifter(150 x 0.8 = 120 grams of protein)
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Moore DR et al., Am J. Clin Nutr 89: 161, 2009
• h-1
) 0.15
cc
FSR
(%
0.10 bb
uscl
e F
0.058 6 EAA
a
M
0.00
~8.6g EAA
0 10 20 30 4020 grams of protein in the recovery
Protein (g)20 grams of protein, in the recovery period, creates the maximal amount of muscle tissue regeneration.
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ProteinProtein
Sample PlanSample Plan• Meat (2 X 4 ounces) 56 grams
G i (12 i ) 36• Grains (12 servings) 36 grams• Milk (3 servings) 24 grams• Vegetables (6 servings) 12 grams
128 grams
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ProteinProtein
D f i t k• Dangers of excess intake– protein catabolism requires water water loss
d h d ti i kdehydration risk– increase urinary calcium loss– may increase risk for coronary artery disease– supplemental amino acids may cause imbalance,
b ti diffi lti t i itabsorption difficulties, toxicity– may contribute to kidney problems in some people
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Fat Fat
• Less than 30% of daily caloric needsy
• Restrict saturated/hydrogenated fat for• Restrict saturated/hydrogenated fat for overall health benefits
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FatFat
• Source of energy during aerobic exerciseSource of energy during aerobic exercise
• Some fats are essential to maintain normal biological function
• Required for absorption of fat-soluble vitamins A,D,E,K
• High fat intake prior or during activity may affect performance
• Choose healthier fats: canola or olive oil, nuts, seed, avocado
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Vitamins and Athletes• Essential for optimal function of your body
– Athletes likely need additional vitamins and minerals– Athletes likely need additional vitamins and minerals– A balanced diet with adequate calories should
provide enough not many athletes are doing thisprovide enough…not many athletes are doing this• Functions:
– Digestion of food– Digestion of food– Muscle contraction
Release of energy stores– Release of energy stores– Growth and development
P id l i ( )• Provide no calories (or energy)
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General SupplementationGeneral Supplementation
– Remember to get:Remember to get:• Vitamin D 1,000-2,000 IU’s/day• Omega-3 (DHA +EPA) 1 000-2 000 mg/dayOmega-3 (DHA +EPA) 1,000-2,000 mg/day• Calcium supplementation, if needed• Multivitamin• Multivitamin
–Multivitamins do not replace healthy foods
You can’t supplement a “bad”’ diet!
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Inflammation Reduction Through Diet
Omega-3 (1000 mg DHA + EPA)Omega 3 (1000 mg DHA EPA)Antioxidants
Vitamins C and E, beta carotenebeta-carotene
B VitaminsB12, B6, folic acid
Tumeric/curcuminEx. Curry often found in Indian
and Asian foodCoQ10Flavonoids
Stearic acid in dark chocolateStearic acid in dark chocolate
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Inflammation and foodInflammation and food
• Reduce:• Reduce:• Omega 6 to devote calories to increased
Omega 3• Nitrites (processed meats)• Saturated fats, fried foods, trans-fats,
hydrogenated fatsyd oge ed s• Excessive sugars
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Ergogenic AidsErgogenic Aids
• Nitric oxide glycine carnitine lecithinNitric oxide, glycine, carnitine, lecithin, brewer's yeast, hoodia, etc.are very popular with athletes butare very popular with athletes, but…
h h l f l?are they helpful?(many are not)(many are not)
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Ex. of Ergogenic AidsEx. of Ergogenic Aids
• Alcoholi id
• HMB• Amino Acids• Amphetamines
A b li S id
• Ephedrine (ma huang)• Epinephrine
• Anabolic Steroids• Androstenedione
Bl d D i
• Growth Hormone• Hypnosis
• Blood Doping• Caffeine
C i
• Nicotine• Oxygen
• Creatine• DHEA
• Oxygenated Water• Pyruvate
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NCAA Banned Drug ClassesNCAA Banned Drug Classes
1. Stimulants (amphetamine, ephedrine, ritalin,1. Stimulants (amphetamine, ephedrine, ritalin, ecstasy)
2 Anabolic agents (andro testosterone)2. Anabolic agents (andro, testosterone)3. Street drugs (heroin, marijuana)4 P tid h (EPO th h )4. Peptide hormones (EPO, growth hormone)5. Diuretics and urine manipulators6. Anti-estrogens (clomiphene, tamoxifen)
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Over the counter supplements are not strictly regulated by the g yFood & Drug Administration (FDA)
• What does this mean for your team?1. The list of ingredients and claims made by a g y
manufacturer are not necessarily backed up by reliable, scientific research
2. You can’t be sure of a product’s purity or safety3. What is on the label – may not be what is in the bottle4. Athletes are advised that the use of dietary supplements
is at their own risk
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Sleep More, Perform BetterSleep More, Perform Better
• Goal: 7- 9 uninterrupted hours/nightGoal: 7 9 uninterrupted hours/night.– Less than seven hours increases the risk of obesity approximately 30 percent and adds an extra five pounds
• Sufficient sleep enhances neural processing for motor skills, p p g ,insights and perceptions• Too little sleep alters leptin, the “fullness” hormone, and ghrelin, the “appetite” hormone.
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Are You Kidding?(Just for fun…)
Lasagna1,360 Calories
38g Fat
Enchiladas1,870 Calories
46g Fat
Quesadillas1,860 Calories
52g Fat38g Fat46g Fat 52g Fat
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In SummaryFood + Training = PerformanceFood + Training = Performance
• Water (fluids) is the most neglected nutrient byWater (fluids) is the most neglected nutrient by athletes
• Carbohydrates are primary nutrient of interest• Carbohydrates are primary nutrient of interest for athletesA hl d h i d h• Athletes do have greater nutrient needs than sedentary people. Often this need can be met
i h i i l h l hi f d lwith an intentional, healthier food plan
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Recommended Reading/ResourcesRecommended Reading/Resources
• Academy of Nutrition and Dietetics – www.eatright.orgy g g• www.scandpg.org/sports-nutrition/sports-nutrition-fact-sheets/• Re: Supplements –
– www.nsf.org; www.informed-choice.org; www.usp.org; www.consumerlab.com; www.usada.org
P E ti b S Kl i RD• Power Eating by Susan Kleiner, RD• Sports Nutrition Guidebook, by Nancy Clark 2nd edition.
Champaign, IL: Human Kinetics, 1997.p g , ,• Eating for Endurance, by Ellen Coleman 3rd edition. Palo
Alto: Bull Publishing, 1997.
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Consult your friendly dietitian!Consult your friendly dietitian!
Thank you for coming!
Meridan Zerner,MS,RD,CSSD,LD
– 972-560-2655– 214-336-4483
– mzerner@hotmail com– [email protected]