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SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
SportsNutrition_Chapter5_Protein
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SportsNutrition_Chapter5_Protein

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Online lecture for chapter 5.

Online lecture for chapter 5.

Published in: Technology, Business
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Transcript

  • 1. Proteins Chapter 5
  • 2. What are proteins?
    • Amino acids linked together
    • Composed of:
      • Carbon
      • Hydrogen
      • Oxygen
      • Nitrogen
  • 3. Protein Structure
    • Peptide bonds
    • Structure
      • Primary
      • Secondary
      • Tertiary
  • 4. Amino Acids
    • 20 amino acids
    • 9 essential amino acids
      • Come from diet
    • 11 nonessential amino acids
    • Conditionally essential amino acids
      • Tyrosine
      • Cysteine
  • 5. Protein Classification
    • Number of amino acids
      • Dipeptide
      • Tripeptide
      • Oligopeptide
    • Composition
      • Complete
      • Incomplete
    • Quality
      • High
      • Low
  • 6. High-Quality Protein
    • A complete protein
    • Contains extra amino acids for protein synthesis
    • Good digestibility
    • Usually from animal-derived foods
    Photo © Mark Adams/Superstock
  • 7. Low-Quality Protein
    • An incomplete protein
    • One or more limiting amino acids
    • Usually from plant-derived foods
    Photos courtesy of the USDA
  • 8. Complementing Proteins
    • Complementing proteins are incomplete proteins that when eaten together provide a full complement of all essential amino acids.
    Photo © PhotoDisc
  • 9. Complementary Protein Combinations
    • Food examples:
    • Beans & rice
    • Peanut butter sandwich on whole grain bread
    • Lentil soup with whole grain bread
  • 10. Protein Functions
    • Tissue building – builds muscle
    • Cell functioning
      • Enzymes
    • Body functioning
      • Hormones
      • Immune function
      • Fluid balance
    • Energy source
  • 11. What is nitrogen balance?
    • Nitrogen balance is an indicator of nitrogen status and thus protein intake.
    • Equals: (Nitrogen in) – (Nitrogen out)
  • 12. How much protein is needed?
  • 13. Factors Influencing Protein Requirements
    • Total energy intake
    • Desire to lose or gain weight
    • Carbohydrate availability
    • Exercise intensity and duration
    • Training status/fitness level
    • Dietary protein quality
    • Age
  • 14. Protein Sources
  • 15. Questions to Ask About Protein Supplements
    • What is the quantity of protein or amino acids in the product?
    • Is the supplement necessary?
    • What is the cost?
    • Will it enhance performance?
    • Does the supplement have any harmful effects?
  • 16. What should an athlete eat in the hours leading up to competition or training?
    • 4 to 24 hours prior to exercise:
      • Balanced high-CHO meals/snacks
      • Familiar foods
      • CHOs, not proteins, should predominate
    Photo © Photodisc
  • 17. How much protein should be consumed 4 to 24 hours before competition?
    • Depends on how much time before exercise is initiated
    • Lean protein sources
      • 3 to 6 oz turkey, fish, soy
        • or
      • 8 to12 fl oz dairy
      • or
      • Complementing low-fiber plant sources
  • 18. How much protein should be consumed 1 to 4 hours before competition?
    • Focus should be on CHO
    • Small amounts of protein okay (i.e., 2–4 oz lean meat)
    • Lean protein sources preferable
  • 19. What about protein consumption during competition?
    • Protein can serve as an energy source.
    • Consumption during exercise is questionable.
    • There is some research support for branched chain amino acids during competition.
  • 20. What about protein consumption after competition?
    • 6 to 20 grams of high-quality protein
      • Casein
      • Whey
      • Soy
    • Essential amino acids are key.
    • Should be consumed within 3 hours after competition.
    • Hydrolyzed protein sources are absorbed more quickly.

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