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  1. #1
    Lion Muscle EnriqueDeLeon's Avatar
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    What is Lactic Acid? How does it affect training?

    I've heard of lactic acid before & how it fatigues your muscles if you stay in the gym too long. What exactly is it? Why does it affect training?
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  2. #2
    EAT BIG LIFT BIG GET BIG mistabigstuff19's Avatar
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    The cells in your body go through cellular respiration to convert glucose into pyruvate (pyruvic acid) and ATP which is the fundamental energy building block of cells. Cellular respiration involves an oxidizing agent and a reducing agent, the most common oxidizing element is 02(oxygen). In the absence of oxygen, however, cells cannot complete cellular respiration and actually go through a process called fermentation. one form of fermentation is lactic acid fermentation in which the waste given off is lactic acid. Lactic acid thus gets into your muscles and causes a familiar feeling known as cramping. Basically it means you are not taking in enough oxygen to fuel your muscle cells to complete cellular respiration and create more energy and instead your muscles are producing lactic acid.
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  3. #3
    I'll Mod Til I'm Dead ironwill2008's Avatar
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    It's a substance produced in a working muscle that is responsible for the "burn" associated with lifting weight for multiple reps. The increasingly uncomfortable sensation usually eventually forces the trainee to end the set.
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  4. #4
    Registered User ellsbebc's Avatar
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    Builds up after muscle use, often when the muscles are pushed to its limits.

    Causes muscle cramps. Stretching helps reduce buildup
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  5. #5
    On a mission jpatter123's Avatar
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    My bio professor's last semester briefly commented on that lactic acid is not responsible for muscle soreness,cramping, or fatigued as once thought. I won't go into the details as I can't recall the entire lecture.
    Last edited by jpatter123; 01-18-2011 at 11:05 AM.
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  6. #6
    Registered User Araj's Avatar
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    Happens real easy in most peoples shoulders btw.
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  7. #7
    Registered User m3dude's Avatar
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    Originally Posted by jpatter123 View Post
    My bio professor's last semester briefly commented on that lactic acid is not responsible for muscle soreness,cramping, or fatigued as once thought. I won't go into the details as I can't recall the entire lecture.
    i read a similar article recently saying it was calcium leakage or something that caused the burn/muscle fatigue/failure or whatever
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  8. #8
    BulknCut gekkoboy14's Avatar
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    Originally Posted by jpatter123 View Post
    My bio professor's last semester briefly commented on that lactic acid is not responsible for muscle soreness,cramping, or fatigued as once thought. I won't go into the details as I can't recall the entire lecture.
    It is the accumulation of H+ ions from the breakdown of ATP, not lactic acid. LA does not contribute a significant enough H+ to lead to acidosis.
    LA can also be used as an energy substrate
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  9. #9
    BulknCut gekkoboy14's Avatar
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    Originally Posted by m3dude View Post
    i read a similar article recently saying it was calcium leakage or something that caused the burn/muscle fatigue/failure or whatever
    Ca channels can be blocked, which can lead to activation failure.
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  10. #10
    Banned Tyciol's Avatar
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    Originally Posted by EnriqueDeLeon View Post
    I've heard of lactic acid before & how it fatigues your muscles if you stay in the gym too long. What exactly is it? Why does it affect training?
    Lactic acid is fuel, it gets shipped to the liver and built back into pyruvate which feeds your aerobic metabolism and helps to regulate your blood sugar.

    It's a byproduct of fatigue, doesn't cause it.
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  11. #11
    Encyclochuzzle chazzy1864's Avatar
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    It burns.
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  12. #12
    Registered User MGPumpin's Avatar
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    Originally Posted by Tyciol View Post
    It's a byproduct of fatigue, doesn't cause it.
    This, common misconception.
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  13. #13
    Registered User weightmate's Avatar
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    Originally Posted by chazzy1864 View Post
    It burns.
    orly
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