How exactly does protein cause an insulin response?

Discussion in 'Fitness & Nutrition' started by Werdna, Jul 21, 2004.

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  1. Werdna

    Werdna Livin' the SLO Life...

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    Does it cause blood glucose levels to rise? I don't see how it could. Is the nitrogen atom removed from the protein molecule so quickly, that it becomes glucose, and thus causes blood glucose to rise? Or is there an entirely different pathway involved? Anyone know? :dunno:
     
  2. sprite

    sprite Active Member

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    I don't think it does.

    At least when they're talking about trying to illicit a post-workout insulin response, you want protein in addition to the carbs because studies have shown that glycogen is more fully restored when carbs & protein are taken together than with carbs alone. The protein doesn't illicit the insulin spike, the carbs do, and then the protein is along for the ride.
     
  3. blam

    blam New Member

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    yes it does cause an insulin response, though I can't recall the exact mechanism. Infact, there is a GI and GL table floating around the net for meats. I believe fish illicts the highest insulin response.
     
  4. pt

    pt New Member

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  5. quasar

    quasar New Member

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    yes, it does in a process called gluconeogenesis, the nitrogen is removed and the carbon skeleton becomes oxaloacetate (TCA or Krebs cycle intermediate) and subsequently pyruvate which can be converted to glucose. lactate (lactic acid) can also be converted to pyruvate.

    here's a website explaining the pathways:
    http://web.indstate.edu/thcme/mwking/gluconeogenesis.html

    "When glycogen stores are depleted, in muscle during exertion and liver during fasting, catabolism of muscle proteins to amino acids contributes the major source of carbon for maintenance of blood glucose levels"

    and obviously, when glucose levels are raised in the blood, there's going to be an insulin response in order to synthesize glycogen in the liver.

    glycogen is resynthesized from lactate in the muscle cells by the cori cycle
     
    Last edited: Jul 21, 2004
  6. Werdna

    Werdna Livin' the SLO Life...

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    Right, but I was thinking that process would take too long to cause an insulin response immediately post-workout. :dunno:
     
  7. pt

    pt New Member

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    you not reading the read the thread posted above > you
     
  8. quasar

    quasar New Member

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    true, you'd have to break down a sufficient amount of muscle protein or take in additional nutrients (pwo meal) to elicit the response, not sure how long this takes (catabolism -> anabolism) but i've read it does take a few hours if there is no pwo meal
     
  9. quasar

    quasar New Member

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    which thread was above this one?
     
  10. pt

    pt New Member

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    Determinants of post-exercise glycogen synthesis during short-term recovery.

    Jentjens R, Jeukendrup A.

    Human Performance Laboratory, School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, UK.

    "The pattern of muscle glycogen synthesis following glycogen-depleting exercise occurs in two phases. Initially, there is a period of rapid synthesis of muscle glycogen that does not require the presence of insulin and lasts about 30-60 minutes. This rapid phase of muscle glycogen synthesis is characterised by an exercise-induced translocation of glucose transporter carrier protein-4 to the cell surface, leading to an increased permeability of the muscle membrane to glucose...."
     
  11. nukegoat

    nukegoat New Member

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    diabetics know that anything can fuck with insulin
     
  12. quasar

    quasar New Member

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    in bold- that is easily explained by the cori cycle synthesizing glycogen from lactate in muscle cells and increased utilization of glucose from muscle catabolism (translocation of GLUT-4 proteins)
     
  13. OPTIMO

    OPTIMO New Member

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    My pre-workout food is normally 1 cup of non-fat yogurt and 1 cup of granola (10.30am). I'm normally at the gym around 11.30 and then when I get home I take a dose of MuscleMilk. Should I be switching the two based on this read? :dunno: I figured my body could use the goodies after I lift.

    I also eat lunch about 45 min. after the MMilk.
     
  14. pt

    pt New Member

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    Teh granola = teh win

    Because granola = oats.. but preworkout nutrition is usually immediately before your workout (combined with your creatine for example). Still your plan looks pretty solid IMO. :coold:
     
  15. quasar

    quasar New Member

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    i'd recommend a protein shake either before/after or at least some canned tuna, you need protein to build muscle
     
  16. OPTIMO

    OPTIMO New Member

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    I'll bump up when I eat my yogurt/granola then...thanks for the feedback.
    The MMilk has 32g of protein (+16g of protein from the 2% milk) and I take that within 15 min of walking out of the gym. Is that good enough?
     
  17. The Boy Bastard

    The Boy Bastard Bewbie's??

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    I would take it with skim or water. The fat in milk will coat the stomach and can slow the absorption rate of the protein from the shake, since it is meant to be taken in by the body quicker. As opposed to whole foods where the breakdown of protein souces like meats and tuna is slower anyway.
     
  18. OPTIMO

    OPTIMO New Member

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    Thanks, I'll start buying skim milk for the MMilk then. I was just using 2% because it's an easy way to get some more cal/prot. :bigthumb:
     
  19. Ceaze

    Ceaze https://hearthis.at/DoYouEvenUplift Moderator

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    for post workout nutrition this theory is moronic.
     
  20. GOGZILLA

    GOGZILLA Double-Uranium Member

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    you guys worry about the most ridiculous shit
     
  21. pt

    pt New Member

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    Read the thread above and prove it wrong then.
     
  22. Ceaze

    Ceaze https://hearthis.at/DoYouEvenUplift Moderator

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  23. cazzone

    cazzone OT Supporter

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    They would have to have that steak ready to serve cause I'm fuckin ready to eat after a workout.
     
  24. SteveO

    SteveO Guest

    I will prove it wrong

    Let's go with the GI of each one
    Oatmeal = 47, Dextrose = 100

    The whole goal of post workout is to get rid of cortisol and put your body back in an anabolic state, this should be done quickly as possible. Liquid > Food PWO

    haha? This is true for throughout the day, but NOT after working out
     
  25. pt

    pt New Member

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