Youth Exercise & Sport – Relevance of “Sports” Nutrition? Jennifer Sacheck, PhD Tufts University Friedman School of Nutrition Science & Policy John Hancock Center on Physical Activity, Nutrition, and Obesity Prevention 1 The National Crisis ~32% Kids 2-19 yrs ~69% Adults APOP, IOM, 2012 2 Energy In vs. Energy Out Dietary Intake Physical Activity Plethora of Low Cost/Energy Dense Foods Development of Childhood Obesity Multi Media Saturation Increased Portion Sizes Energy OUT Food Advertising/ Marketing Aimed at Children Less Sleep Physical Education and Recess Cuts Energy IN Declines in Physical Activity Sugar Sweetened Beverage Consumption Frequent Eating Away from Home Changing Built Environment We Eat Too Much…. SPAGHETTI & MEATBALLS 20 Years Ago 500 calories 1 cup pasta w/ sauce 3 small meatballs Today 1,025 calories 2 cups of pasta w/ sauce 3 large meatballs Caloric Difference: 525 calories Estimated Calorie Requirements by Age and Activity Level Gender Young child Female Male Age Sedentary Activity Moderate Activity Active 2-3 1,000 1,000-1,400 1,000-1,400 4-8 9-13 14-18 1,200 1,600 2,000 1,400-1,600 1,600-2,000 2,000 1,400-1,800 1,800-2,200 2,400 4-8 9-13 14-18 1,400 1,800 2,200 1,400-1,600 1,800-2,200 2,400-2,800 1,600-2,000 2,000-2,600 2,800-3,200 (Institute of Medicine Dietary Reference Intakes, 2002) WE EAT “DEAD FOOD” AND MORE “DEAD FOOD” Contribution of Solid Fats and Added Sugars to Energy Intake Among Children and Adolescents in the United States Objective: Identify top dietary sources of energy, solid fats, added sugars among 2-18 year olds in the U.S Methods: Data from NHANES (energy-2005-2006; SOFAS 2003-2004) Results: Nearly 40% of total energy consumed was from solid fats and added sugars Results: Top sources of energy for 2-18 year olds were: • Grain Desserts (138 kcal/day) • Pizza (136 kcal/day) • Soda (118 kcal/day); Soda + Fruit Drinks (173 kcal/day) Reedy J, et al. J Am Diet Assoc; 2010; Volume 110 (Oct). Food Sources and Mean Intake of Empty Calories for Male Children and Adolescents, Relative to Discretionary Calorie Allowance Discretionary calorie Soda allowance Soda Soda Whole milk 290 165 195 171 Males (by age) Reedy J, et al. J Am Diet Assoc; 2010; Volume 110 (Oct). Data Source: NHANES 2003-04 AND WHAT ABOUT SUGAR?..... WHITE, CANE, BEET, FRUIT, TABLE, BROWN, & HFCS….& HONEY, MAPLE SYRUP, & AGAVE Sources of Dietary Added Sugars: Americans Ages 2+, NHANES 2005-2006 Total Television Food Advertising Exposure, by Age Teens see 14 ads/day Rudd Report TRENDS IN TELEVISION FOOD ADVERTISING. Data Used from Nielsen Report (2008) Lack of Physical Activity Can Johnny Come Out and Eat? 16 Physical Activity Guidelines for Children Children and adolescents should do 60 minutes or more of physical activity daily. Aerobic: Most of the 60 or more minutes a day should be either moderate- or vigorous-intensity aerobic physical activity, and should include vigorous-intensity physical activity at least 3 days a week. Muscle-strengthening: As part of their 60 or more minutes of daily physical activity, children and adolescents should include musclestrengthening physical activity on at least 3 days of the week. Bone-strengthening: As part of their 60 or more minutes of daily physical activity, children and adolescents should include bonestrengthening physical activity on at least 3 days of the week. Youth Meeting Physical Activity Guidelines Troiano R, et al. Medicine & Science in Sports & Exercise, 2008. Massachusetts Youth Risk Behavior Survey, 2011 Youth Cardiorespiratory Fitness 12-19 yrs (NHANES 1999-2002) • ~65% of males and females met the standard Males Females Pate et al 2006 19 Built Environment & Free Play 20 Physical Education 150 min/week for elementary and 225 min/week of PE for middle and high school students APOP, IOM, 2012 21 Media Blitz APOP, IOM, 2012 22 Contribution of Organized Sports to Physical Activity Recommendations Physical Activity During Youth Sports Practices Design: Cross-sectional study Setting: Community sports leagues in San Diego County (middle income areas) Participants: 200 youth, ages 7-14 from 29 teams total of youth soccer and baseball/softball Measurement: Minutes of PA at intensity levels using accelerometers and established cut-points Leek, D. et al. Arch Pediatr Adolesc Med 2010;0:archpediatrics.2010.252v1-6. Moderate to Vigorous Physical Activity (MVPA) during Practice and Participants Meeting PA Guidelines by Sex Leek, D. et al. Arch Pediatr Adolesc Med 2010;0:archpediatrics.2010.252v1-6. Contribution of Organized Sports to Physical Activity Recommendations: Physical Activity During Youth Indoor Soccer Games Design: Cross-sectional study Setting: Indoor soccer leagues in suburban Massachusetts Participants: 113 boys and girls Measurement: Minutes of PA at intensity levels using accelerometers and established cut-points Sacheck, et al. Pediatric Exercise Science, 2010 Out of School Time – Organized Sports Time spent at various intensities of physical activity during a 50-min soccer match Males Females Time Time Intensity Min % Min % Sedentary 25.9 (4.5) 50.0 (8.6) 25.1 (6.2) 48.4 (11.1) Light 10.2 (3.7) 19.7 (6.6) 9.2 (2.6) 17.8 (5.1) Moderate 11.9 (3.0)* 23.0 (5.6)** 13.7 (3.7) 26.6 (7.4) Vigorous 3.9 (2.7) 7.4 (5.0) 3.7 (2.3) 7.2 (4.5) MVPA 15.8 (4.4) 30.4 (8.0) 17.5 (4.7) 33.8 (9.5) Values are means (SD). Moderate-to-vigorous activity (MVPA). * P < 0.05, ** P < 0.01, vs. females Sacheck et al, Ped Exer Sci, 2010 % Time spent in different intensities of physical activity during a 50-min soccer match by BMI category N N N Normal Weight NNormal Weight Overweight/Obese Overweight/Obese Values are means SE. Different than normal weight individuals **P<0.01 Estimated kcals for BMR, AEE, and TEE during a 50-min soccer match by BMI category N N N N Normal Weight Normal Weight Overweight/Obese Overweight/Obese BMR = basal metabolic rate; AEE = activity energy expenditure; TEE = total energy expenditure (BMR + AEE). Values are means SE. Different than normal weight individuals *P<0.05, **P<0.01 Consequences 29 Poor Health Outcomes WHO estimates that 1.9 million deaths worldwide are attributable to physical inactivity APOP, IOM, 2012 30 The Somerville FIT Study BMI <85th %tile >85th %tile (n=236) (n=194) Fitness Fit (n=192) Unfit (n=206) Cholesterol (mg/dL) 155.1 (24.4) 158.8 (26.1) 157.1 (26.0) 156.2 (24.7) Triglycerides (mg/dL) 73.3 (26.1) 106.8 (61.4)** 76.0 (25.9) 100.5 (62.2)** HDL (mg/dL) 56.1 (11.4) 49.6 (10.6)** 55.7 (10.7) 50.9 (11.6)** LDL (mg/dL) 84.4 (20.1) 87.8 (22.7) 86.3 (22.3) 85.3 (20.6) **P<0.001 Combined Impact of Fitness & Fatness on Metabolic Risk Factors in Children Black Bars = unfit 32 Mean Number of Fitness Tests Passed by BMI Percentile End run, ab strength, flexibility, upper body strength and agility Kim et al Obes Res 2005 33 What is happening? • Obese children may: – have a more difficult time moving their body against gravity – Be more likely to have physical complications/pain during PA – perform less PA so that they also have less opportunity to practice and develop proficiency – have fewer opportunities for and have less enjoyment in PA 34 Adult Fitness, BMI and CVD Mortality in Men • Fitness trumps “fatness” (Aerobics Center Longitudinal Study) 35 Lee et al Circulation 2011 Student Academic Achievement 36 Likelihood of Passing Academic Tests For Each Fitness Test Passed by Massachusetts Students in Grades 4 to 8 Odds of passing increased by 24% per test passed Odds of passing increased by 38% per test passed Chomitz V, et al. Journal of School Health, 2009. Kids: Sports Nutrition Issues • Consuming adequate calories • Eating consistent meals • Getting a good balance of foods/nutrients (carbohydrate, protein, & fat) • Refueling after exercise • Drinking enough fluids – Most appropriate fluids • Inappropriate use of sports drinks, bars and supplements Estimated Calorie Requirements by Age and Activity Level Gender Young child Female Male Age Sedentary Activity Moderate Activity Active 2-3 1,000 1,000-1,400 1,000-1,400 4-8 9-13 14-18 1,200 1,600 2,000 1,400-1,600 1,600-2,000 2,000 1,400-1,800 1,800-2,200 2,400 4-8 9-13 14-18 1,400 1,800 2,200 1,400-1,600 1,800-2,200 2,400-2,800 1,600-2,000 2,000-2,600 2,800-3,200 (Institute of Medicine Dietary Reference Intakes, 2002) Macronutrient Needs • Protein: 10-30% calories • Carbohydrate: 45 to 65% calories • Fat: 25-35% calories – 5 to 10% as linoleic acid – 0.6 to 1.2% as linolenic acid RDA Males Females 9-13 yr 34 34 14-18 yr 52 46 Protein (g/day) Carbohydrate (g/day) 9-13 yr 130 130 14-18 yr 130 130 Protein Needs: 0.8-1.2 g/kg/day Recommended Dietary Allowance for Protein Grams of protein needed each day Children ages 1 – 3 13 Children ages 4 – 8 19 Children ages 9 – 13 34 Girls ages 14 – 18 46 Boys ages 14 – 18 52 Women ages 19 – 70+ 46 Men ages 19 – 70+ 56 Here are examples of amounts of protein in food: •1 cup of milk has 8 grams of protein •A 3-ounce piece of meat has about 21 grams of protein •1 cup of dry beans has about 16 grams of protein •An 8-ounce container of yogurt has about 11 grams of protein WHAT TO EAT? – 2/3 carbohydrates: • 1/3 bread, bagels, cereal, rice, pasta, crackers, pretzels • 1/3 vegetables, beverages – 1/3 protein OR LESS: • Meat, poultry, fish, dairy foods, nuts, seeds, soy foods, dried beans, eggs Nutrient Needs: Critical Minerals Males Females Calcium (mg/day), AI Calcium – Most important for obtaining peak bone mass at this age 9-18 Iron 1300 1300 (700-1150 actual intake) (550-800 actual intake) Iron (mg/day), RDA – Increased need related to rapid rate of linear growth, increase in blood volume, and in females, onset of menarche 9-13 8 8 14-18 11 15 Zinc (mg/day), RDA Zinc – Required for sexual maturation, important cofactor in enzymes 9-13 8 8 14-18 11 9 Thermal Stress and Children • Children rely more on convection and radiation, which are enhanced through greater peripheral vasodilation • Evaporative heat loss is lower because of reduced sweat rates • Children have greater ratios of surface area to mass • Acclimatization to heat is slower in boys than in adult men (no data available for girls) Water is critical for endurance performance! And What About All Those Drinks??? Sport Drinks • Uniquely designed to meet both energy and fluid needs of athletes • Composition influences gastric emptying • Carbohydrate solutions empty more slowly • Most sports drinks contain: – 6-8% CHO in the form of glucose and glucose polymers – 20-60 mmol/L sodium • Adding glucose stimulates sodium and water absorption • Sodium increases thirst Who Really Needs Sports Drinks? • American Academy of Pediatrics: – “If children are participating in prolonged vigorous physical activity in hot, humid conditions for more than one hour, small amounts of sports drinks may be appropriate” • 2010 National Youth PA & Nutrition Study – 16% drank at least one serving/day – 9% drank at least two servings/day • Participation in varsity sports: 33% (girls) 37% (boys) Johnston LD, et al. Am J Prev Med 2007; Volume 33 (Oct). Hydration BEFORE – Water! • 1-2 hours before: 2-1/2 cups (20 oz.) • 15-30 min before: 1-1/2 cups (12 oz.) DURING – Water! 8 oz every 15-20 min • diluted fruit juice, sports drinks (6-8%) IF exercise is >60 min AFTER – Water! Drink 2 cups for each pound lost • Weigh yourself before and after exercise • Don’t trust thirst • Avoid caffeine Caffeine Benefits Increases: • Mental alertness • Concentration • Catecholamine release • Use of fats by muscles • Decreases fatigue & lowers perception of effort • Improves endurance performance – May improve sprint/strength performance Potential side-effects • Increased urination • Gastrointestinal distress • Tremors • Decreased sleep • Nervousness/Anxiety symptoms • Irregular heart rate/rhythm Ergogenic Aids • • • Ergogenic = “work-producing” Performance enhancers Many product claims – • Energy, enhance performance, change body composition This includes ergogenic aids that are: – – – – – – Pharmacological – amphetamines, caffeine, diuretics Hormonal – anabolic steroids, oral contraceptives Physiological Nutritional Psychological Biomechanical Four Important Questions • Effective? – – – – – Advertisements Popular press Anecdotal evidence Personal experience Research and science • Safe? – Toxicity and knowledge • Legal? – Determined by governing body of the sport • Ethical? – Moral, guiding principles Sports Supplements • • • • Natural and safe are NOT the same Supplements can interfere with medications More is NOT BETTER Tell someone what you take, or are planning to take • Be informed, and be cautious with supplements, as what you don’t know may hurt you! And What About Those Bars??? Nutrition Facts • We eat FOOD, NOT nutrients • Athletes need carbohydrate, protein and fatcontaining foods daily • We can be selective about the types of foods we choose to eat: • Fish instead of a hot dog • Kashi instead of Fruit Loops • Peanut butter instead of bacon Bottom Line!! • Food, fluid, and rest are essential for peak mind and body performance • Food choices, timing, and amounts matter • Foster POSITIVE environments Healthy Kids Out of School Unite out-of-school organizations around nutrition and physical activity principles and providing the resources to help them become effective venues for childhood obesity prevention. Three Guiding Principles Drink Right: Choose water instead of sugar-sweetened beverages. Move More: Boost movement and physical activity in all programs. Snack Smart: Fuel up on fruits and vegetables. Healthy Kids Hub website