What's the physiology behind HIIT?

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    Jul 12, 2010 1:15 AM GMT
    OK,

    The muscles are working really, really fast.

    They need lots of oxygen.

    So the heart and lungs work harder.

    The circulation goes up.

    But it seems like a lot more is happening with the body under such extreme demands than just your ordinary need for more oxygen. I have just worked my way up to doing HIIT on the elliptical and I can see differences in alertness and motivation way after my exercise.

    I would like to get down to the physiological nitty-gitty. What are the muscles doing, via nervous system and hormones? What is the brain doing, nervously and hormonally? What is happening thruout the body when stressed via HIIT? Liver? Adrenal glands?

    Is anybody knowledgable in the physiology here or can point me to a good source to read about it?
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    Jul 12, 2010 2:15 AM GMT
    I heard it improves your VO2 max.. Your body/lungs utilizes oxygen better, or something like that. I feel that it improves reaction time as well.
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    Jul 12, 2010 12:12 PM GMT
    Some info here:


    http://www.bodybuilding.com/fun/bbinfo.php?page=hitprograms
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    Jul 12, 2010 3:08 PM GMT
    Two good responses. Thanks. That website is bigoted and I wrote and told them so. ... ;-)

    Edit: That VO2 is a good lead to start my search.
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    Jul 12, 2010 3:18 PM GMT
    Caslon15000 saidTwo good responses. Thanks. That website is bigoted and I wrote and told them so. ... ;-)

    Haven't been on that site in a while. If I knew they had problems, I wouldn't have recommended them. Thanks for the heads up.
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    Jul 12, 2010 3:27 PM GMT
    socalfitness said
    Caslon15000 saidTwo good responses. Thanks. That website is bigoted and I wrote and told them so. ... ;-)

    Haven't been on that site in a while. If I knew they had problems, I wouldn't have recommended them. Thanks for the heads up.

    well, they state that you want to look good on the beach for the opposite sex. I just pointed out that that was an offensive prejudicial assumption.

    It has some good info, esp for staying motivated.
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    Jul 12, 2010 3:31 PM GMT
    The first few seconds of the HI part of HIIT involves anaerobic (without oxygen) conditioning, until the lungs and heart can catch up with the demand for more.

    As a result, your brain ends up getting more oxygen than its used to, which helps it process information more efficiently.

    <-- Dr. diagnosed yet self-treated ADHD patient who made straight A's in college. Meds suck baws. icon_wink.gif
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    Jul 12, 2010 3:32 PM GMT
    PS. Bodybuilding.com is where you find all the closeted muscle-worshippers. icon_twisted.gif
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    Jul 12, 2010 4:40 PM GMT
    This article on cardiovascular exercise looks like a good source of topics to investigate. http://en.wikipedia.org/wiki/Cardiovascular_exercise

    "Among the recognized benefits of doing regular aerobic exercise are:
    Strengthening the muscles involved in respiration, to facilitate the flow of air in and out of the lungs
    Strengthening and enlarging the heart muscle, to improve its pumping efficiency and reduce the resting heart rate, known as aerobic conditioning
    Strengthening muscles throughout the body
    Improving circulation efficiency and reducing blood pressure
    Increasing the total number of red blood cells in the body, facilitating transport of oxygen
    Improved mental health, including reducing stress and lowering the incidence of depression
    Reducing the risk for diabetes.
    As a result, aerobic exercise can reduce the risk of death due to cardiovascular problems. In addition, high-impact aerobic activities (such as jogging or jumping rope) can stimulate bone growth, as well as reducing the risk of osteoporosis for both men and women.
    In addition to the health benefits of aerobic exercise, there are numerous performance benefits:
    Increased storage of energy molecules such as fats and carbohydrates within the muscles, allowing for increased endurance
    Neovascularization of the muscle sarcomeres to increase blood flow through the muscles
    Increasing speed at which aerobic metabolism is activated within muscles, allowing a greater portion of energy for intense exercise to be generated aerobically
    Improving the ability of muscles to use fats during exercise, preserving intramuscular glycogen
    Enhancing the speed at which muscles recover from high intensity exercise
    Both the health benefits and the performance benefits, or "training effect", require a minimum duration and frequency of exercise. Most authorities suggest at least twenty minutes performed at least three times per week.[citation needed]"

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    Jul 12, 2010 5:00 PM GMT
    paulflexes saidPS. Bodybuilding.com is where you find all the closeted muscle-worshippers. icon_twisted.gif
    lol
    leeave my bodybulding closeted hunks sexy men alone... i love to stare at them...lol
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    Jul 12, 2010 5:13 PM GMT
    NB

    HIT is not the same as HIIT