Physical Activity for LIFE February 7, 2010 Rick Seip, PhD Research Scientist, Genomas, Inc. & Senior Scientist (per diem) Preventive Cardiology Hartford Hospital rseip@harthosp.org 860-545-5005 Who is this fitness expert? Billy Blanks, 7 time World Champion in karate Inventor of “Tae Bo”, combination of boxing and tae kwan do Jack LaLanne Overweight? You’ve gotta start Who is this fitness proponent? MOVIN!!! 10,000 counts per day Guidelines for healthy adults < age 65 Basic recommendations from ACSM and AHA (2007): Do moderately intense cardio 30 minutes a day, 5 days a week Or Do vigorously intense cardio 20 minutes a day, 3 days a week And Do eight to 10 strength-training exercises, eight to 12 repetitions of each exercise twice a week. http://www.acsm.org/AM/Template.cfm?Section=Home_Page&TEMPLATE=CM/HTMLDisplay.cfm&CONTENTID=7764 Mortality Rates, 1900 Cause 33% Pneumonia 11.8 Tuberculosis Tuberculosis Diarrhea Enteritis 11.3 8.3 HeartDisease Disease Heart Liver Disease 6.3 5.2 Injuries Injuries Cancer 4.2 3.7 Senility Senility 2.9 Diptheria 2.3 0 2 4 6 8 10 % of All Deaths Source: Healthy People 2010, US Dept HHS 12 14 Mortality Rates, 2004 Heart disease 57% 28 Cancer 22.75 Stroke Cause 6.4 5.2 4.5 COPD Unintentional Injuries Diabetes 3 2.7 2.6 1.7 1.4 Pneumonia Alzheimer's Kidney Disease Septicemia 0 10,000 counts per day 5 10 15 20 25 30 % of All Deaths Source: U.S. National Center for Health Statistics, Health, United States, 2005 Physical Activity on the JOB... • 1900’s: – 40% of occupations developed or required a high level of fitness • 1990: only 5% of occupations require high level of physical fitness – delivery person – bicycle messenger – airport baggage handler – various laborers (farmers?) – waiter, bellhop, valet Increase Your “Health Span” . . . Cardiovascular Disease Obesity & Type II Diabetes Mobility, Fall Prevention, & Osteoporosis Risk Factors for Coronary Heart Disease • Modifiable Nonmodifiable – Dyslipidemia – Age High LDLcholesterol – Sex Low HDL-cholesterol – Family history of premature CHD High TGs – Smoking – Hypertension – Diabetes mellitus 90% of those diagnosed with CHD have at least one of the four top risk factors – Obesity – Dietary factors – Thrombogenic factors – Sedentary lifestyle Wood D, et al. Atherosclerosis. 1998;140:199-270. Development of Atherosclerotic Plaques Fatty streak Normal Lipid-rich plaque Foam cells Fibrous cap Thrombus Lipid core Ross R. Nature. 1993;362:801-809 Drug that Affect Serum Lipids Drug class LDL HDL Statins * 18-55% 5-15% Fibrates 5-20% 10-20% 20-50% Nicotinic acid 5-25% 15-35% 20-50% Resins 15-30% 3-5% TG 7-30% no NCEP ATP III. JAMA. 2001;285:2486-2497. * Lipitor ® (atorvastatin), Crestor® (rosuvastatin), Zocor ® (simvastatin), Pravastatin ® (pravachol), Mevacor® (Lovastatin); lovastatin was isolated from Chinese red yeast rice 10,000 counts per day Hypertension • Systolic BP > 140 mmHg • Diastolic BP > 90 mmHg MILD HYPERTENSION • Systolic BP • Diastolic BP 130 - 140 80 - 90 How can Physical Activity Improve Your Health? • CR Fitness, Calorie Expenditure, Low Fat diet, Stop Smoking, Active Relaxation • Obesity & Diabetes • Calorie Expenditure • Cardiovascular Disease • Osteoporosis & Fall Prevention • Dietary calcium, Vitamin D, Resistance Training, Flexibility Exercises “Walking may be the only physical activity suitable for the entire lifespan” P.O. Astrand, Swedish physiologist Walking 1 mile requires 80-100 kcal energy expenditure Energy Expenditure of Walking (kcal per mile) Min / mile 30.00 24.00 20.00 17.14 15.00 13.33 12.00 Your Body Weight (lbs.) 132 154 176 198 80 93 106 120 73 86 98 110 69 81 92 104 66 77 88 99 64 75 85 96 62 73 83 93 61 71 81 91 A Long-Duration (118-day) Backpacking Trip (2669 km) Normalizes Lipids Without Medication: A Case Study DAY 89 DAY 118 % Change Chol 276 189 196 - 29 Trig 319 111 79 - 75 HDLc 41 68 63 + 37 LDLc 167 99 118 - 29 5’ 7” 170 lbs 25.5 -13 -13 3130 48.7 25.5 +14 +36 +52 124 78 -6 -20 PRE Ht 5’ 7” Wt 188 lbs BMI 29.4 Calories Eaten 2738 SatFat 35.7 Fiber 16.7 SBP 132 DBP 98 2653 31.9 g 31.7 Modal Travel in Urban Areas: Europe and North America Percent of Trips by Mode Country Netherlands Germany England Italy Canada USA Bicycle Walking Public Transport 30 12 8 5 1 1 18 22 12 28 10 9 5 16 14 16 14 3 Transportation Quarterly 1997; 51:31 Car 4 49 62 42 74 84 Highway Vehicle Miles Traveled are projected to grow 60% by 2030, in step with the growing U.S. population. VMT (billions) US population (Millions) VMT (billions) US population (millions) 5000 500 4500 450 4000 400 3500 350 3000 300 2500 250 2000 200 15000 Miles per year traveled by motor vehicle per each person in US 12500 10000 7500 5000 1500 150 1000 100 500 2500 50 0 2000 2005 2010 2015 2020 2025 2030 0 0 Year 2000 2005 2010 2015 2020 2025 Year 2000 2005 2010 2015 2020 2025 Source: Transportation Vision for 2030 US Department of Transportation, January 2008 http://www.rita.dot.gov/publications/transportation_vision_2030/pdf/entire.pdf Resistance Training Bill Pearl, age 37 Mr. Universe, 1967 Bill Pearl, last formal pose, 1989 age 59 !! Resistance Training … General Guidelines Resistance Training … Tailor your Program! Resistance Training … a sample Program How can Physical Activity Improve Your Health? • CR Fitness, Calorie Expenditure, Low Fat diet, Stop Smoking, Active Relaxation • Obesity & Diabetes • Calorie Expenditure • Dietary calcium, Vitamin D, • Osteoporosis & Resistance Training, Fall Prevention Flexibility Exercises • Cardiovascular Disease Q: 1 pound of fat stores how many calories? A: 3500 10,000 counts per day??? WHAT IS YOUR BMI? How to Find Your BMI: Height: 66” Weight: 180 lbs. 160 lbs. 140 lbs. BMI = 29.5 26.5 23 Obesity Classification Based on Body Mass Index (BMI) BMI Classification < 25 Normal (desirable) weight 25- 29.9 Overweight > 30 Obesity Class I > 35 Class II > 40 Class III 40 35 a b BMI 30 c c 25 20 15 10 <5000 5000 7499 7500 9999 Steps per Day Krumm et al., J.Women’s Health 15:202-10, 2006 >10,000 CAN EXERCISE PREVENT TYPE II DIABETES? DPP - Results NIH news release (August, 2001) Prevalence of T2DM at three years: 30 25 20 15 10 5 0 Normal Care Drug: Metformin Walking and dietary restriction Lifestyle Exercise and Diet Therapies Contribute to Weight Loss from J.S.Garrow, Acta Scand. Med. 711:67-73, 1986 RESTRICT DIET Treatment Emphasis Exercise Problem Obesity 24 26 24 28 30 32 34 36 Body Mass Index 38 40 42 How can Physical Activity Improve Your Health? • CR Fitness, Calorie Expenditure, Low Fat diet, Stop Smoking, Active Relaxation • Obesity & Diabetes • Calorie Expenditure • Dietary calcium, Vitamin D, • Osteoporosis & Resistance Training, Fall Prevention Flexibility Exercises • Cardiovascular Disease OSTEOPOROSIS & FALL PREVENTION Osteoporosis: The Bone Thief Helen grew up on a dairy farm in the Midwest. She drank 3 glasses of milk a day as a child. After high school she began work as a secretary in a local law office where she spent her entire career. Helen never jogged, walked as exercise, or played tennis. She went through menopause at age 47. Shortly before retirement at age 61, she slipped on a small rug in her kitchen and broke her hip. After Helen recovered, she needed a cane to walk. Ref: The National Institute of health Age Page http://www.nih.gov/nia/health/agepages/osteo.htm (2/14/01) 50 y.o. man 58 y.o. man 76 y.o. man 87 y.o. woman Snow-Harter & Marcus, ESSR, 1991 Prevent the Minimize the FORCE of the fall FALL THE FRACTURE PREVENTION TRIANGLE Reduce the FRAGILITY of bone. Wrist Fracture Vertebral Fracture Hip fracture ABC TEST (Powell & Myers, J Gerontol: Med Sci 50A M28-M34, 1995.) HOW CONFIDENT ARE YOU THAT YOU WILL NOT LOSE YOUR BALANCE, OR BECOME UNSTEADY, WHEN YOU: 0% 1. 2. 3. 4. Walk around the house Walk up and down the stairs Pick up a slipper from the floor Reach at eye level 10 20 30 40 50 60 70 80 90 100% |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 5. Reach on tip toes |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 6. Stand on chair to reach 7. Sweep the floor |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 8. Walk outside to a nearby car 9. Get in/out of a car |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 10. Walk across a parking lot |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 11. 12. 13. Walk up and down a ramp Walk in a crowded mall Walk in a crowd; bumped |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 14. Ride escalator holding rail |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 15. Ride escalator not holding rail |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| 16. Walk on icy sidewalks |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------| LOW MOBILITY HIGH MOBILITY Falls occur because of both: Internal (host) factors External (environmental) factors “Internal” factors • Decreased vision • Postural hypotension • Impaired balance and/or gait • Chronic diseases that impair mental or physical functioning • Certain medications, such as sedatives and antidepressants External (environmental) factors: • • • • Poor lighting Lack of handrails on staircases Objects in pathways Non-secured rugs Preventing Falls Problem Postural Hypotension Impaired muscle strength/range of motion Use of sedatives/hypnotics/ psychotropics SOLUTION Practice hand clenching, ankle pumping, dorsi/plantar flexing . Balance and strengthening exercises Use medications properly; learn non-pharmacologic treatment for sleep disorders Preventing Falls Problem SOLUTION Review your meds Complex drug regimens with pharmacist or physician Physical symptoms or impairments: dizziness, disability, poor vision . Install grab bars, handrails. Correct foot or leg problems. Exercises for balance Balance impairment and gait abnormalities Preventing Falls through a safer environment Problem Carpets, rugs, furniture SOLUTION Replace torn rugs, anchor loose edges Add non-skid back to slippery rugs. Arrange furniture so it is not obstructive Use high back chairs Bathroom . Label all medications. Ensure adequate lighting. Keep toilet seats raised. Non-skid surfaces in bath/shower Grab bars in or near commode Preventing Falls through a safer environment Problem Kitchen SOLUTION Nonslip wax on floors; Use assistive devices (walker, handrails). Stairway Keep wood or vinyl floors dry and clean Reducing Fragility… What can You do to Improve Bone Mass? • Diet rich in Calcium • Adequate in Vitamin D • Weight-bearing and resistance training exercises • Medication approved by the Food and Drug Administration (FDA) BECOME MORE ACTIVE 10,000 counts per day Thank you for your Attention EXTRA SLIDES Cardiovascular Disease includes Heart Disease and Stroke What is the significance of this symbol? Women are Susceptible to Cardiovascular Disease Prevalence of CVD by Age and Sex Percent of Population M a le F ema le 80 70 60 50 40 30 20 10 0 18-1 9 20-2 9 30-3 9 40-4 9 50-5 9 60-6 9 70-7 9 >8 0 http://www.medslides.com/member2/Cardiology/women.ppt 9/98 NHANES III 1988-1991 medslides.com 5 GO RED FOR HEART VISIT THIS WEBSITE TO CALCULATE YOUR RISK FOR CARDIOVASCULAR DISEASE: http://www.americanheart.org Women and CVD … surprising facts: • CVD, particularly coronary heart disease (CHD) and stroke, remain the leading causes of death in women in America and most developed countries • Coronary heart disease claims the lives of 248,184 females annually compared with 41,394 lives from breast cancer and 65,632 from lung cancer. • CVD death rate… higher in black women than in white women • CVD is #1 among all disease categories in hospital discharges for women • 38% of women vs. 25% of men die within 1 yr after a heart attack • Of the 4.8 million stroke survivors alive today, 56% are women • Yet misperceptions still exist that CVD is not a real problem for women. http://www.americanheart.org/presenter.jhtml?identifier=2859 Family (children, spouse, parents) Household (food, cleaning,upkeep) Personal Health Work Money Other commitments Heart Attack Warning Signs • Some heart attacks are sudden and intense • the "movie heart attack," where no one doubts what's happening • But most heart attacks start slowly • with mild pain or discomfort • Often people affected aren't sure what's wrong and • wait too long before getting help. From: http://www.americanheart.org/presenter.jhtml?identifier=3053#Heart_Attack Symptoms of Heart Attack: • Chest discomfort… • Discomfort in the center of the chest that lasts more than a few minutes… may go away and come back… can feel like uncomfortable pressure, squeezing, fullness or pain. • Discomfort in other areas of the upper body… • Pain / discomfort in one or both arms, the back, neck, jaw or stomach. • Shortness of breath… • May occur with or without chest discomfort. • Other signs: • Cold sweat, nausea, or lightheadedness From: http://www.americanheart.org/presenter.jhtml?identifier=3053#Heart_Attack Symptoms of heart attack may be quite different in women: As with men, women's most common heart attack symptom is chest pain or discomfort. But women are somewhat more likely than men to experience some of the other common symptoms, particularly shortness of breath, nausea/vomiting, and back or jaw pain. • • • • Shortness of breath...with or without chest discomfort. Nausea and light-headedness Flu-like symptoms, including chills and cold sweats Heart palpitations From: http://www.americanheart.org/presenter.jhtml?identifier=3053#Heart_Attack Stroke Warning Signs: Similar in Men & Women If you notice one or more of these signs, don't wait. Stroke is a medical emergency. Call 9-1-1 or your emergency medical services. Get to a hospital right away! The American Stroke Association wants you to learn the warning signs of stroke: • Sudden numbness or weakness of the face, arm or leg, especially on one side of the body • Sudden confusion, trouble speaking or understanding • Sudden trouble seeing in one or both eyes • Sudden trouble walking, dizziness, loss of balance or coordination • Sudden, severe headache with no known cause High LDL-C and Low HDL-C: Increased Risk of CHD 3 Relative CHD Risk Over 4 years 2 25 1 45 65 85 0 100 160 220 HDL-C (mg/dL) LDL-C (mg/dL) Castelli WP et al. Can J Cardiol. 1988;4(suppl A):5A-10A. U.S. ADULTS About 60-70% get no exercise or not enough to maintain/increase CR fitness 10,000 counts per day BECOME MORE ACTIVE 10,000 counts per day CAN EXERCISE PREVENT TYPE II DIABETES? Diabetes Prevention Program NIH funded study of: Prevention of diabetes, & Cost effectiveness of preventive measures “Walking may be the only physical activity suitable for the entire lifespan” P.O. Astrand, Swedish physiologist Walking 1 mile requires 80-100 kcal energy expenditure Highway Vehicle Miles Traveled are projected to grow 60% by 2030, in step with the growing U.S. population. VMT (billions) US population (Millions) VMT (billions) US population (millions) 5000 500 4500 450 4000 400 3500 350 3000 300 2500 250 2000 200 15000 Miles per year traveled by motor vehicle per each person in US 12500 10000 7500 5000 1500 150 1000 100 500 2500 50 0 2000 2005 2010 2015 2020 2025 2030 0 0 Year 2000 2005 2010 2015 2020 2025 Year 2000 2005 2010 2015 2020 2025 Source: Transportation Vision for 2030 US Department of Transportation, January 2008 http://www.rita.dot.gov/publications/transportation_vision_2030/pdf/entire.pdf Metabolic Response to 10-lb Weight Loss: Framingham Data Small changes can add up to significant changes in long-term risk mg/dl 0 -1 -2 -3 -4 -5 -6 -7 -8 mm Hg mg/dl Men Women Cholesterol Syst BP Higgins M et al. Acta Med Scand Suppl 1988;723:23-36. Glucose “Exercise Lite” Every American adult should accumulate 30 minutes or more of moderate intensity physical activity over the course of most days of the week. (recommendation of ACSM + CDC, 1993) Guidelines for healthy adults < age 65 Basic recommendations from ACSM and AHA (2007): Do moderately intense cardio 30 minutes a day, 5 days a week Or Do vigorously intense cardio 20 minutes a day, 3 days a week And Do eight to 10 strength-training exercises, eight to 12 repetitions of each exercise twice a week. http://www.acsm.org/AM/Template.cfm?Section=Home_Page&TEMPLATE=CM/HTMLDisplay.cfm&CONTENTID=7764 Energy Expenditure of Walking (kcal per mile) Min / mile 30.00 24.00 20.00 17.14 15.00 13.33 12.00 Your Body Weight (lbs.) 132 154 176 198 80 93 106 120 73 86 98 110 69 81 92 104 66 77 88 99 64 75 85 96 62 73 83 93 61 71 81 91 Q: 1 pound of fat stores how many calories? A: 3500 10,000 counts per day??? So …What do you mean by 10,000 steps / day? GOAL: ATTAIN > 10,000 pedometer counts per day But… Many people are sedentary, … and most sedentary people are overweight. Sedentary people attain ~ 5,000 pedometer counts per day Activity Categories Category Sedentary Low Active Moderately Active High Active Daily Pedometer Counts <5000 5000-7499 7500-10,000 >10,000 How can I lose weight? How can a pedometer work for me? Suppose you weigh 190 lbs. Current activity: 5,000 counts/day If you decide to increase your pedometer counts by +1,000 each day, . . . to attain an average of 6,000 counts/day . . . You will lose 5.2 lbs in one year Calculations For a 190 lb person, walking 1 mile expends 100 kcal Since 1 mile = 2,000 counts, it follows that ½ mile = 1,000 counts. then 1,000 counts expends ~ 50 kcal. If you increase daily pedometer counts by 1000/day…, this will result in an additional expenditure of 350 kcal/week, 1,400 kcal/month, 18,200 kcal/yr. 18,200 kcal ÷ 3,500 kcal/lb = 5.2 lbs of fat lost in 1 year Risk Factor ... • High Cholesterol & triglycerides • High BP Exercise Effect: • Lowers TG … little effect on cholesterol if do not have hi TG • Lowers BP 5-10 mmHg • Diabetes • ½ as likely to become diabetic • Smoking • (?) Hard to smoke & exercise Obesity ? … Walk 1 mile, burn 100 kcal Exercise and Diet Therapies Contribute to Weight Loss from J.S.Garrow, Acta Scand. Med. 711:67-73, 1986 RESTRICT DIET Treatment Emphasis Exercise Problem Obesity 24 26 24 28 30 32 34 36 Body Mass Index 38 40 42 Cardiovascular Disease Risk • Major Risk Factors for Heart Disease and Stroke High levels of blood cholesterol Hypertension or high blood pressure Tobacco use Diabetes mellitus • Other Risk Factors Include Physical inactivity Obesity & Poor diet (High Fat, Sat Fat) ADOLESCENCE: A time to Learn the Adult Lifestyle of Inactivity !!! 10,000 counts per day Young People Reporting Vigorous Activity on 3 of the Previous 7 Days Boys & Young Men Girls & Young Women 80 Percentage 70 60 50 40 30 20 10 0 11 12 13 14 15 16 17 Age (yrs) (Source : SG R p .1 9 1 ; NHIS-YR BS stud ie s) 18 19 20 21 22 Current Status: Physical Activity of Children? ? % of Pop. Getting Phys.Act. Sufficient to Maintain Wt. Balance Childhood Adolesc LIFESPAN Adulthood Kids in the 1990’s less active compared to kids in the 1950’s (William Strong, editorial in Circulation, 1990) • TV Viewing in 1950’s: 4 hr / week 1990’s: 28 hr /week • more kids in day care – effect: day care centers tend to restrict activity • more latch key children: – effect: parents “stay indoors ‘til we get home” • decreasing “green” space Distribution of Hours of TV Per Day: NHES Youth Aged 12-17 in 1967-70 and NLSY Youth Aged 12-17 in 1990 35 30 25 Percent Distribution 20 15 NHES 1967-70 NLSY 1990 10 5 0 0-1 1-2 2-3 3-4 4-5 TV Hours (Youth Report) 5+ Prevalence of Obesity by Hours of TV per Day: Prevalence (%) NHES Youth Aged 12-17 in 1967-70 and NLSY Youth Aged 10-15 in 1990 40 35 30 25 20 NHES 1967-70 15 NLSY 1990 10 5 0 TV Hours Per Day (Youth Report) Working Hypothesis: Childhood Activity levels may be re-setting to a new low % of Pop. Getting Phys.Act. Sufficient to Maintain Wt. Balance Childhood Adolesc LIFESPAN Adulthood New Risk Factors … Ready for Prime Time? Oxidized LDL Homocysteine Lp(a) C-reactive protein (CRP) C-Reactive Protein (CRP) • What is it? – Circulating protein produced by liver – Marker for general inflammation • How does it contribute to CVD risk? – Atherosclerosis is an inflammatory disease, CRP is (partly) a marker for inflammation • How to reduce your risk: Insulin • What is it? – Hormone responsible for allowing blood glucose (sugar) to enter cells. – Very important to muscle function; body is 40% muscle • How does it contribute to CVD risk? – Muscles become resistant to insulin, high insulin promotes arterial thickening • How to reduce your risk: MOVE !!!! • What is it? Homocysteine – Amino acid that is normally changed to another aa – High level: > 12 umol/L • How does it contribute to CVD risk? – Disrupts thrombolysis (increased clotting) – contributes to arterial thickening & “aging” (deficient methylation) • How to reduce your risk: – Increase dietary folate, vitamins B6, B12 Sources (9/3/03): http://familydoctor.org/handouts/249.html http://www.bhf.org.uk/questions/index.asp?secondlevel=370&thirdlevel=378 Christen WG et al. Arch Intern Med. 2000 Feb 28;160(4):422-34 Energy Expenditure of Walking (kcal per mile) Min / mile 30.00 24.00 20.00 17.14 15.00 13.33 12.00 Your Body Weight (lbs.) 132 154 176 198 80 93 106 120 73 86 98 110 69 81 92 104 66 77 88 99 64 75 85 96 62 73 83 93 61 71 81 91 Energy Expenditure of Running (kcal per mile) Min / mile 10.91 10.00 9.23 8.57 8.00 7.50 7.06 Your Body Weight (lbs.) 132 154 176 198 108 126 144 162 107 125 143 160 106 124 142 159 105 123 141 158 105 122 140 157 104 122 139 157 104 121 139 156 Women themselves may lack appreciation of their individual risk for heart disease. Women present to the hospital one hour later than a man will Women: • frequently continue activities when they feel ill • mistake their symptoms as not serious, or - fail to realize that they represent a cardiac condition From: http://www.womentowomen.com/LIBheartattacksymptoms.asp accessed 2/7/06 Name that bodybuilder… Ronnie Coleman Seven time Mr. Olympia Name that bodybuilder… Bev Francis 1st woman to bench press 300 lbs. Adela Garcia-Freidmansky Ms. Olympia 2004 & 2006 Physical Activity and Health A Report of the Surgeon General 1996 U.S. Department of Health and Human Services Centers for Disease Control and Prevention National Center for Chronic Disease Prevention and HealthPromotion President’s Council on Physical Fitness and Sports