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Nutrition and energy


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Nutrition (Midterm)

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Nutrition and energy

  1. 1. ENERGY
  2. 2. <ul><li>Calorie - used as standard unit for measuring the energy value of food </li></ul><ul><li>- amount of heat necessary to raise 1 gram of water by 1̊C </li></ul><ul><ul><li>measures human energy expenditures </li></ul></ul><ul><li>1 Kcal = 4.184 kilojoules (KJ) </li></ul><ul><li>1000 KJ = 1 megajoule (MJ) </li></ul><ul><li>1000 Kcal = 4.184 MJ </li></ul><ul><li>1 MJ = 239 Kcal </li></ul>
  3. 3.
  4. 4. Methods of Energy Measurement <ul><li>Direct calorimetry </li></ul><ul><ul><li>Measures amount of energy expended by monitoring heat production </li></ul></ul><ul><ul><li>Bomb calorimeter – heat of combustion = gross energy value of food </li></ul></ul><ul><ul><li>Respiration chamber – heat released from a person’s body determine how much energy each activity has burned for that person </li></ul></ul>
  5. 5. <ul><li>Indirect calorimetry </li></ul><ul><ul><li>Measured by determining with a respirometer the oxygen consumption and carbon dioxide production of the body in a given period of time </li></ul></ul><ul><ul><ul><ul><li>Volume of CO 2 Eliminated </li></ul></ul></ul></ul><ul><ul><ul><ul><li>RQ = ———————————— </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Volume of O 2 Consumed </li></ul></ul></ul></ul>
  6. 6. <ul><li>Indirect Calorimeter </li></ul><ul><li>- Atwater (physiologic fuel value of food) </li></ul>
  7. 7. Energy Pathways <ul><li>Glycolysis – major pathway of CHO metabolism; 1 glucose  2 pyruvate </li></ul><ul><ul><ul><li>anaerobic </li></ul></ul></ul><ul><li>Pyruvate  acetyl CoA </li></ul><ul><li>TCA cycle  additional ATP and Carbon dioxide </li></ul><ul><li>Electron transport chain  Water </li></ul>
  8. 8. WMSU BSND Review 2007
  9. 9. Glucose <ul><li>The fate of pyruvate </li></ul><ul><ul><li>Anaerobic vs. aerobic pathways </li></ul></ul><ul><li>Occurs in the cytoplasm </li></ul><ul><li>Pyruvic acid & ATP </li></ul><ul><li>Sprint activity </li></ul>Occurs in the mitochondria  CoA (Pyruvic acid +Coenzyme) Aerobic exercise
  10. 10. Glucose <ul><li>The fate of pyruvate </li></ul><ul><ul><li>Anaerobic </li></ul></ul><ul><ul><ul><li>Pyruvate-to-lactic acid </li></ul></ul></ul><ul><ul><ul><ul><li>Cori cycle </li></ul></ul></ul></ul>
  11. 12. Glucose <ul><li>The fate of pyruvate </li></ul><ul><ul><li>Aerobic </li></ul></ul><ul><ul><ul><li>Pyruvate-to-acetyl CoA </li></ul></ul></ul>
  12. 13. Glycerol & Fatty Acids <ul><li>Fatty acids-to-acetyl CoA </li></ul><ul><ul><li>Beta-oxidation (mitochondria) </li></ul></ul>
  13. 14. Amino Acids <ul><li>Amino acids-to-acetyl CoA </li></ul>WMSU BSND Review 2007
  14. 15. Amino Acids <ul><li>Deamination </li></ul><ul><ul><li>Keto acid </li></ul></ul><ul><ul><li>Ammonia </li></ul></ul>WMSU BSND Review 2007
  15. 16. Amino Acids <ul><li>Transamination </li></ul>
  16. 17. Amino Acids <ul><li>Ammonia- </li></ul><ul><li>to-urea </li></ul>
  17. 18. <ul><li>Urea excretion via the kidneys </li></ul>
  18. 20. Economics of Feasting <ul><li>Excess protein </li></ul><ul><li>Excess carbohydrate </li></ul><ul><li>Excess fat </li></ul>
  19. 21. Economics of Feasting
  20. 22. Economics of Fasting WMSU BSND Review 2007
  21. 23. Economics of Fasting <ul><li>Glucose needed for the brain </li></ul><ul><li>Protein meets glucose needs </li></ul>
  22. 24. Economics of Fasting <ul><li>Shift to ketosis </li></ul>
  23. 25. Economics of Fasting <ul><li>Suppression of appetite </li></ul><ul><li>Slowing of metabolism </li></ul><ul><li>Symptoms of starvation </li></ul>
  24. 26. Energy Balance <ul><li>Weight Stability: </li></ul><ul><li>Energy intake balances with energy out </li></ul>
  25. 27. Energy Balance <ul><li>Overweight and obesity result from an energy imbalance </li></ul><ul><li>Body weight is the result of genes, metabolism, behavior, environment, culture and socio-economic status </li></ul><ul><li>Behavior and environment play a large role causing people to be overweight and obese (greatest areas for prevention and treatment actions) </li></ul>
  26. 28. Positive & Negative Energy Balance
  27. 29. Energy Intake <ul><li>What regulates our food intake? </li></ul><ul><ul><li>Hunger </li></ul></ul><ul><ul><ul><li>Prompts eating; physiological desire </li></ul></ul></ul><ul><ul><ul><li>Hypothalamus : center that control activities such as maintenance of water balance, temperature regulation, appetite control </li></ul></ul></ul><ul><ul><li>Appetite </li></ul></ul><ul><ul><ul><li>The integrated response to the sight, smell, thought or taste of food that initiates or delays eating </li></ul></ul></ul><ul><ul><li>Satiation </li></ul></ul><ul><ul><ul><li>Feeling of satisfaction and fullness that occurs during a meal signals to stop eating </li></ul></ul></ul><ul><ul><li>Satiety </li></ul></ul><ul><ul><ul><li>Feeling of satisfaction that occurs after a meal; inhibits eating until the next meal </li></ul></ul></ul>
  28. 30. A Cascade of Regulation: Hunger Appetite Satiation and Satiety
  29. 31. WMSU BSND Review 2007
  30. 32. Satiety hormone? <ul><li>Leptin </li></ul><ul><li>▪ An appetite-suppressing hormone </li></ul><ul><li>▪ Produced by adipose tissue </li></ul><ul><li>▪ Travels to the brain </li></ul><ul><li>▪ Directly linked to appetite and body fatness </li></ul><ul><li>▪ Gain of body fatness stimulates leptin production (reduces food consumption resulting in fat loss) </li></ul><ul><li>▪ Loss of body fat reduces </li></ul><ul><li>leptin secretion </li></ul><ul><li>(increasing appetite) </li></ul>
  31. 33. HYPOTHALAMUS <ul><li>The main function is homeostasis </li></ul><ul><li>Receives inputs about the state of the body </li></ul><ul><li>Dozens of chemical participate in appetite control and energy balance </li></ul><ul><li>▪ Neuropeptide Y </li></ul><ul><li> ▪ causes CHO cravings </li></ul><ul><li> ▪ initiates eating </li></ul><ul><li> ▪ decreases energy expenditure </li></ul><ul><li> ▪ increases fat storage </li></ul>
  32. 34. COMPOSITION OF FOODS/MEALS IMPACTS SATIATION AND SATIETY <ul><li>Protein – most satiating; may account for the popularity of high-protein weight loss diet </li></ul><ul><li>Complex CHO/Fibers – fill stomach, delay absorption of nutrients </li></ul><ul><li>Fat – weaker impact on satiation, however, in the intestine secretes CCK which signals satiety </li></ul>
  33. 35. Energy Expenditure <ul><li>Energy Out: Components of Energy Expenditure </li></ul><ul><ul><li>Basal Metabolism (BMR) </li></ul></ul><ul><ul><li>Physical Activity (PA) </li></ul></ul><ul><ul><li>Thermic Effect of Food (TEF) </li></ul></ul>
  34. 36. Basal Metabolic Rate <ul><li>Basal metabolism – is the basic essential metabolic processes by the body at rest also defined as the minimum amount of energy required to carry out vital processes. </li></ul><ul><li>Basal metabolic rate – the amount of energy required for basal metabolic processes per unit of body weight per unit of time. </li></ul>
  35. 37. <ul><li>BMR </li></ul><ul><li>Male = 1 kcal/kg IBW/hr </li></ul><ul><li>Female = .95 kcal/kg IBW/hr </li></ul><ul><li>Example: IBW 56 kg, Female </li></ul><ul><li>BMR = .95 kcal x 56 x 24 hrs. </li></ul><ul><li> = 1276.8 kcal/day </li></ul>
  36. 38. Energy Expenditure <ul><li>BMR: 60 to 65% </li></ul><ul><li>PA: varies from individual </li></ul><ul><li>TEF: 10% </li></ul>
  37. 39. Energy Balance: Energy Expenditure
  38. 40. Increase BMR Decrease BMR <ul><li>Fever * Stress </li></ul><ul><li>Total body weight </li></ul><ul><li>Smoking * Caffeine </li></ul><ul><li>High Lean Body Mass </li></ul><ul><li>Rapid growth </li></ul><ul><li>Hot & cold ambient temp </li></ul><ul><li>Pregnancy, lactation </li></ul><ul><li>Hyperthyroidism </li></ul><ul><li>Large body surface area </li></ul><ul><li>Aging </li></ul><ul><li>Female </li></ul><ul><li>Fasting/Starvation </li></ul><ul><li>Sleep </li></ul><ul><li>Hypothyroidism </li></ul>
  39. 41. Physical activity <ul><li>Voluntary movement of the muscles and the support system </li></ul>Types of activity % kcal/kg Bedridden 25 Sedentary (light) 30 Moderate (active) 35 Very active (heavy) 40 Strenuous 45
  40. 42. Example: Female, IBW = 56 kgs. BMR = 1276.8 kcal/day Activity = Light activity (30%) PA = BMR x Activity = 1276.8 kcal/day x 30% = 383.04 kcal/day
  41. 43. <ul><li>Thermic Effect of Food (TEF or DIT) </li></ul><ul><li>- estimate energy requirements of processing of food. </li></ul><ul><li>- on usual mixed diet- 6 to 10 % total energy expenditure for basal and physical activity </li></ul><ul><li>- high protein diet – 15% </li></ul><ul><li>- high fat and carbohydrate diet – 5% </li></ul>
  42. 44. Energy Balance: Body Weight <ul><li>Body Mass Index </li></ul><ul><ul><ul><ul><ul><li>BMI = weight (kg) </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> height (m) 2 </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>or </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>BMI = weight (lb) x 703 </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> height (in) 2 </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Healthy weight is 18.5 to 24.9 (WHO, 1979) </li></ul></ul></ul></ul></ul>
  43. 45. Table 6. Proposed BMI Classification by FAO/WHO (RENI, 2002) Classification BMI (kg/m 2 ) Risk of co-morbidities Underweight < 18.5 Low Normal Range 18.5 – 24.9 Average Overweight 25.0-29.9 Increased Obese 30-39.9 Moderate Extreme obese > 40 Severe
  44. 46. Estimating Energy Requirement <ul><li>Calculate the IBW using the tannhauser’s formula </li></ul><ul><li>Calculate the BMR </li></ul><ul><li>Calculate the Physical Activity </li></ul><ul><li>Calculate the TEF </li></ul><ul><li>Calculate the TER </li></ul>
  45. 47. 1. IBW (Ideal BodyWeight) <ul><li>Steps: </li></ul><ul><li>a. take height into cm </li></ul><ul><li>b. Subtract the factor 100 and the result is the ideal body weight in kilograms (large frame) </li></ul><ul><li>c. subtract 10% for medium frame (Filipinos) </li></ul><ul><li>d. subtract another 10% for small frame </li></ul><ul><li>Note: do not round off the answer. </li></ul>
  46. 48. Limitations of BMI <ul><li>BMI does not reflect body fat </li></ul><ul><li>May misclassify people (muscular) </li></ul><ul><li>Used to reflect disease risks </li></ul><ul><li>Reflects height and weight – not body composition </li></ul>BMI = 31 Is this obese???
  47. 49. BODY FAT/BODY COMPOSITION <ul><li>Men and women vary in body composition </li></ul><ul><li>. Men typically have greater lean mass </li></ul><ul><li>. Women have greater body fat </li></ul><ul><li>. Normal Body Fat </li></ul><ul><li>. Men – 12-20% </li></ul><ul><li>. Women – 20-30% </li></ul>
  48. 50. Energy Metabolism <ul><li>Glycogenesis (glucose to glycogen) </li></ul><ul><li>Glycogenolysis (glycogen to glucose) </li></ul><ul><li>Gluconeogenesis (amino acids to glucose) </li></ul><ul><li>Lipogenesis (glucose or FAAs to fats) </li></ul><ul><li>Lipolysis (fats to FAAs & glycerol) </li></ul>
  49. 51. Metabolic Energy Production: Review & Overview <ul><li>Reactants: glucose </li></ul><ul><ul><li>Glycogen, FAAs </li></ul></ul><ul><ul><li>Amino acids </li></ul></ul><ul><li>Phosphorylation </li></ul><ul><li>Glycolysis–cytoplasm </li></ul><ul><ul><li>2 ATPs, anaerobic </li></ul></ul><ul><li>Citric Acid Cycle-2 ATPs, mitochondria, aerobic </li></ul><ul><li>Electron Transport system </li></ul><ul><li>High energy e-,  32 ATPs </li></ul>
  50. 52.
  51. 53. Fat Metabolism WMSU BSND Review 2007
  52. 54. Pancreatic Hormones, Insulin & Glucagon Regulate Metabolism
  54. 56. Alcohol <ul><li>Class of organic compounds with hydroxyl groups (OH) </li></ul><ul><li>Examples of alcohol: </li></ul> H H – C – OH H – C – OH H – C – OH H Glycerol: component of triglycerides H H – C – H H – C – H OH Ethanol or Ethyl Alcohol: alcohol found in beer, wine, distilled spirits
  55. 57. Facts About Ethanol <ul><li>1 g ethanol = 7 kcal without additional nutrients </li></ul><ul><li>Medically defined as a depressant drug when taken in low levels  euphoric effect </li></ul><ul><li>could dissolve lipids in cell membranes  rapidly enter cells </li></ul><ul><li>Production of ethanol: anaerobic metabolism of CHO by microorganisms </li></ul><ul><li>“ proof” : amount of ethanol stated in distilled liquors </li></ul><ul><li>100 proof = 50% ethanol </li></ul><ul><li> 80 proof = 40% ethanol </li></ul>
  56. 58. Facts About Alcohol <ul><li>1 alcoholic drink contains ½ oz of pure ethanol </li></ul><ul><li>4-5 oz wine </li></ul><ul><li>10 oz wine cooler </li></ul><ul><li>12 oz beer </li></ul><ul><li>1 ¼ oz distilled liquor </li></ul><ul><li>(80 proof- whiskey, scotch, rum, vodka) </li></ul>
  57. 59. Digestion, Metabolism and Utilization <ul><li>A. In the Stomach </li></ul><ul><li>- no digestion needed, quickly absorbed </li></ul><ul><li>- if stomach is empty, then 20% directly absorbed through gastric lining </li></ul><ul><li>- Alcohol absorption is minimized in the presence of food </li></ul><ul><li>- Alcohol in stomach  breakdown by alcohol dehydrogenase </li></ul><ul><li>* Women produce less alcohol dehydrogenase </li></ul>
  58. 60. <ul><li>B. In the Duodenum </li></ul><ul><li>- Alcohol readily absorbed and metabolized compared to other nutrients  transported through intestinal veins and capillaries to the liver </li></ul>
  59. 61. <ul><li>C. In the Liver </li></ul><ul><li>- Liver produces alcohol dehydrogenase that oxidizes alcohol </li></ul><ul><li>- Normally: liver breaks and uses fatty acids as its energy source </li></ul><ul><li>- in the presence of alcohol, liver metabolize alcohol first instead of fat </li></ul><ul><li>- Liver can process ½ oz of ethanol per our </li></ul><ul><li>alcohol consumed > available enzymes, extra alcohol circulates throughout the body </li></ul>
  60. 62. Table 1. Effects of Alcohol on the Brain Blood R-OH Conc. Effect on Brain 0.05 Impaired judgment, relaxed inhibitions, altered mood, increased heart rate 0.10 Impaired coordination, delayed reaction time, exaggerated emotions, impaired peripheral vision, impaired ability to operate a vehicle 0.15 Slurred speech, blurred vision, staggered walk, seriously impaired coordination and judgment 0.20 Double vision, inability to walk 0.30 Uninhibited behavior, stupor, confusion, inability to comprehend 0.40-0.60 Unconsciousness, shock, coma, death due to cardiac or respiratory failure
  61. 63. Table 2. Alcohol Doses and Blood Levels No. of Drinks Percentage of blood alcohol by body weight 100 lbs 120 lbs 150 lbs 180 lbs 200 lbs 2 0.08 0.06 0.05 0.04 0.04 4 0.15 0.13 0.10 0.08 0.08 6 0.23 0.19 0.15 0.13 0.11 8 0.30 0.25 0.20 0.17 0.15 12 0.45 0.36 0.30 0.25 0.23 14 0.52 0.42 0.35 0.34 0.27
  62. 64. Table 3. Health Effects of Alcohol Consumption What is the health problem? What is the effect of alcohol? Arthritis Increased risk of having gout Cancer Increased risk of cancer of the liver, rectum, breast, pancreas, mouth, throat: very harmful when combined with tobacco or nicotine Fetal alcohol syndrome Causes permanent physical, behavior, mental abnormalities in the fetus Heart Disease Raises blood pressure, blood lipids, and increased risk for stroke Diabetes May increase or decrease blood glucose levels
  63. 65. Table 3. Health Effects of Alcohol Consumption What is the health problem? What is the effect of alcohol? Kidney problems Enlarges the kidneys Liver disease Fatty liver, cancer of the liver Malnutrition Increased risk of having PEM and other vitamin/mineral deficiencies Nervous disorders Causes dementia, impairs balance and memory Obesity Increased energy intake Psychological disturbances Causes depression, anxiety and insomnia
  64. 66. Table 4. Myths and Truths about Alcohol Myths Fact Alcohol warms the body. Blood is momentarily diverted to skin  overall effect is a cooling one Wine and beer do not lead to addiction. Substance abuse is directly related to amounts consumes and is not dependent on the kind of alcoholic beverage consumed Mixing drinks gives a hangover. Excessive alcohol intake of any kind results in a hangover Walking will “sober up” a person. Alcohol metabolism is time-dependent. Only liver cells not muscle cells can metabolize alcohol
  65. 67. Table 4. Myths and Truths about Alcohol Myths Fact Caffeine offsets the effects of alcohol. Caffeine is a stimulant but will not speed up alcohol metabolism Driving coordination is still impaired after a night of drinking. Allow at least 24 hours for alcohol to be metabolized completely
  67. 69. Physical Fitness <ul><li>A set of abilities individuals possess to perform specific types of physical activity </li></ul><ul><li>Physically fit individuals have energy for both planned and unplanned activities at home or the workspace </li></ul>
  68. 70. Physical Fitness <ul><li>Physical Activity can be classified as: </li></ul><ul><ul><li>Unstructured physical activity </li></ul></ul><ul><ul><ul><li>Usual activities of daily life </li></ul></ul></ul><ul><ul><li>Structured physical activity </li></ul></ul><ul><ul><ul><li>Planned program designed to improve physical fitness </li></ul></ul></ul>
  69. 71. Physical Fitness <ul><li>Benefits of physical fitness: </li></ul><ul><ul><li>Restful sleep </li></ul></ul><ul><ul><li>Nutritional health </li></ul></ul><ul><ul><li>Optimal body composition </li></ul></ul><ul><ul><li>Optimal bone density </li></ul></ul><ul><ul><li>Lower incidence of anxiety and depression </li></ul></ul><ul><ul><li>Improves self image </li></ul></ul><ul><ul><li>Improves circulation and lung function </li></ul></ul>&quot;Those who do not find time for exercise will have to find time for illness.&quot; ~ Earl of Derby
  70. 72. Excessive Exercise Risks Children Energy needs not achieved and limited growth and development Teens Inadequate energy intake Dietary protein used for energy Amenorrhea Negative calcium balance and reduced bone mass Sports anemia Adults Possible increased need for riboflavin and vitamin B6 Exercise-related injuries Pregnant Women Low weight gain Low-birth-weight infant Nursing mothers Excessive rate of weight loss, reducing milk production and limiting the infant growth Older adults Exercise-related injuries leading to disability
  71. 73. Components of Fitness <ul><ul><li>Flexibility – ability to bend and recover without injury </li></ul></ul><ul><ul><li>Muscle strength – ability of ,muscles to work against resistance </li></ul></ul><ul><ul><li>Muscle endurance – ability of muscle to contact repeatedly without being exhausted </li></ul></ul><ul><ul><li>Cardio-respiratory endurance – ability to perform large muscle dynamic exercise of moderate to high intensity for prolonged periods. </li></ul></ul>
  72. 74. Basic Elements of the Exercise Prescription <ul><li>Frequency </li></ul><ul><li>Intensity </li></ul><ul><li>Time </li></ul><ul><li>Mode </li></ul><ul><li>Rate of Progression </li></ul>
  73. 75. Frequency <ul><li>Number of days per week </li></ul><ul><li>Hard/Easy principle </li></ul><ul><li>Active rest </li></ul>
  74. 76. Intensity <ul><li>Initial levels of fitness determine at what intensity a client should begin with. </li></ul><ul><li>Methods of determining intensity: </li></ul><ul><ul><li>% of Maximum heart rate </li></ul></ul><ul><ul><li>heart rate reserve </li></ul></ul><ul><ul><li>Perceived Exertion </li></ul></ul>
  75. 77. Time <ul><li>ACSM recommendation: “ every individual should accumulate 30 minutes or more of moderate physical activity on most , but preferably all days of the week”. </li></ul>
  76. 78. Mode <ul><li>What the client likes or will do! </li></ul><ul><li>Health and weight loss should involve using large muscle groups. </li></ul><ul><li>Weight bearing exercise for strengthening bones. </li></ul><ul><li>Specific exercise for performance. </li></ul><ul><li>Swimming is not great for weight loss. </li></ul>
  77. 79. Rate of Progression <ul><li>3 stages: </li></ul><ul><ul><li>initial conditioning stage-4 weeks. </li></ul></ul><ul><ul><li>improvement stage- 4 to 5 months. </li></ul></ul><ul><ul><li>maintenance stage- begins 6 months after start, can last a lifetime! </li></ul></ul>
  78. 80. Exercise Prescription <ul><li>Simultaneous increase in any 3 elements may overload the individual's physiological system increasing risk to exercise-related injuries and exercise burn out </li></ul>
  79. 81. Stages of Progression in Exercise Program <ul><li>Stages: </li></ul><ul><ul><li>Initial Conditioning </li></ul></ul><ul><ul><li>Improvement </li></ul></ul><ul><ul><li>Maintenance </li></ul></ul>
  80. 82. Factors Related to Exercise Program Adherence Biological Factors Relative body fat Overweight Psychological Factors Self motivation Self efficacy Attainment of exercise goals Depression/anxiety/introversion
  81. 83. Factors Related to Exercise Program Adherence Social Factors Family Support Family Problems Exercise/job Conflicts Income and education levels Behavioral Factors Smoking Leisure time Credit training Type A behavior prone
  82. 84. Factors Related to Exercise Program Adherence Program Factors Social support Location and convenience of exercise facility Exercise leadership and supervision Initial exercise intensity Variety of exercise modes Program costs
  83. 85. Strategies to Increase Exercise Program Adherence <ul><li>Program Strategies </li></ul><ul><ul><li>Offer both group and individual activities </li></ul></ul><ul><ul><li>Select time and locations that are convenient for program participants </li></ul></ul><ul><ul><li>Offer variety of exercise and fitness activities </li></ul></ul><ul><ul><li>Monitor the progress of program participants </li></ul></ul>
  84. 86. Strategies to Increase Exercise Program Adherence <ul><li>Program Strategies </li></ul><ul><ul><li>Set realistic short-term and long-term goals for each participants </li></ul></ul><ul><ul><li>Educate participants about exercise, physical fitness and health benefits </li></ul></ul><ul><ul><li>Provide incentive for exercise </li></ul></ul><ul><ul><li>Encourage social support </li></ul></ul>
  85. 87. Strategies to Increase Exercise Program Adherence <ul><li>Behavioral Strategies for Exercise Leaders </li></ul><ul><ul><li>Be a positive role model </li></ul></ul><ul><ul><li>Show interest in participants </li></ul></ul><ul><ul><li>Exhibit enthusiasm </li></ul></ul>
  86. 88. Strategies to Increase Exercise Program Adherence <ul><li>Behavioral Strategies for Exercise Leaders </li></ul><ul><ul><li>Develop good rapport with each participant </li></ul></ul><ul><ul><li>Motivate and encourage </li></ul></ul><ul><ul><li>Attend to orthopedic and musculoskeletal problems of participants </li></ul></ul>
  87. 89. Importance of Nutrition in Performance <ul><li>Inadequate intake of essential nutrients impair performance due to: </li></ul><ul><ul><li>Inadequate energy supply </li></ul></ul><ul><ul><li>Inability to regulate exercise metabolism at an optimal level </li></ul></ul><ul><ul><li>Decreased synthesis of key body tissues or enzymes </li></ul></ul>
  88. 90. Importance of Nutrition in Performance <ul><li>Excessive intake of essential nutrients impair performance results to: </li></ul><ul><ul><li>Increased proportions of body fat </li></ul></ul><ul><ul><li>Poor athletic performance </li></ul></ul><ul><ul><li>Increased risk of developing diseases </li></ul></ul><ul><ul><li>Toxicity symptoms </li></ul></ul>
  89. 91. Energy Requirements During Performance
  90. 92. How the Body Stores Energy Glycogen in liver Fat in adipose Tissues Glycogen is used to top-up the blood glucose level Majority of glycogen is stored in muscles
  91. 93. How the Body Stores Energy <ul><li>Exercise  converts stored energy to kinetic energy and heat </li></ul><ul><li>Muscles use energy at a rate directly proportional to the rate and intensity of the activity or exercise </li></ul>
  92. 94. Factors that Influence Fuel Choices <ul><li>1. Fuel availability from the diet </li></ul><ul><li>2. Intensity and duration </li></ul><ul><li>3. Degree to which the body is conditioned to perform the activity </li></ul>
  93. 95. Intensity and Duration Activity Intensity Activity Duration Preferred Source Fuel Oxygen Needed Activity Example Extreme < 30s ATP NO Shot put Very High 30s – 3m Carb NO ¼ mile run High 3 - 20m Carb and some fats YES cycling, swimming Moderate > 20m Fat and some carbs YES hiking
  94. 96. FLUID INTAKE The following are the guidelines to ensure adequate fluid replacement, leading to optimal performance a. Eat a nutritionally balanced diet and drink adequate fluids during the 24-hour period before an event b. Consume 2 cups of fluid 2 hours before exercise followed by another 2 cups 15 to 20 minutes before exercise and 4 to 6 oz fluid every 10 to 15 minutes during exercise. c. Drink cool beverages to reduce body core temperature. d. Consume sports drink to enhance fluid intake and absorption and help delay fatigue in endurance events lasting longer than 1 hour. e. After exercise, consume sports drink to enhance palatability and further promote fluid replacement.