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Thread: Body fat levels for elite male sprinters?

  1. #21
    Jon Drummond's eyes don't look too dark to me

  2. #22
    yeah i guess with my white skin, blonde hair and green eyes i may as well give up running completely


  3. #23
    sprinter984, A lot of gyms use the digital fat scales for people that are jsut coming in and really out of shape. Most people have said they are only accurate if you are over 15%

  4. #24
    i hear the same about the infrared tests. They are not to accurate if you have a low body fat percentage. I've recorded 1% on an old one. I recently was tested on a new one, and i got 5% which varies 1-2%.

  5. #25
    the darker the skin and eyes, the less fat the person will hjave (by nature)
    you cant be serious? if you are, please expand on this.
    Everytime I watch that movie I can't believe Drago loses.

  6. #26
    Elite sprinters are lean probably because they're naturally that way and tend to stay that way even when eating a caloric excess. It's the issue of bodyfat setpoint. This is an incredibly complicated topic when one starts to examine all the various things that influence bodyfat levels like leptin. Basically, the higher leptin levels are, the easier it is to maintain a given bodyfat %. An elite sprinter or any other naturally lean athlete say, at 5% bodyfat, will have higher leptin levels, and thus a more normal metabolism, than someone who diets down to that range. Scientists can take a look at certain brain chemicals and tell whether one is in a "dieted" or "fed" state. An elite sprinters brain chemicals would look normal even at 5% bodyfat. Someone who had to diet down to that level would have certain brain chemicals that would show an adaptation by the body to starvation.

    When leptin levels are normal, as they are in a "fed" state, the body's performance is maximized. Someone who has to diet to maintain a low bodyfat isn't going to be in a fed state. With decreases in leptin also come decreases in performance which is why it would be difficult for someone at 15% bodyfat to diet down to 5% bodyfat and maintain that long term while increasing their performance. Leptin also induces a shift towards more type II muscle fiber and more efficient nervous system characterized by athletes in speed dominated sports.

    When examining the issue of race one carries the genes of their ancestors. If their ancestors lived in places where food was abundant year round then their genetics will tend to be that of the "spendthrift" phenotype where low bodyfat levels are easily maintained, muscle is easily gained, excess calories are burnt off, and the metabolic rate is higher. Their ancestors never had to worry about periods of starvation so their metabolisms tend to be inefficient. Excess calories are either burnt off or used to build muscle mass. Leaness can be maintained with little rebellion by the body.

    In contrast, those with a "thrifty" phenotype have genes which have evolved to being faced with periods of famine. Even though famines may not exist for them now, they still carry the genes that allowed their ancestors to deal with them as efficiently as possible. This is not good for athletic success! For people in this category (most americans), their bodies deal with caloric excess by storing as much as possible (fat) and deal with caloric deprivation by slowing the metabolism. They will also have a higher natural amount of bodyfat to begin with as this would be an asset in times of starvation. Since muscle is metabolically active and costly they also tend to have less muscle mass and have a more difficult time building it and lose it much quicker during periods of diet.

  7. #27
    A fine theory but rather flawed. How do you explain the higher rate of obesity in African Americans and Hispanic Americans as compared to White Americans.

    Could it be socio economic? Could it be lifestyle? I think so.

    People these days eat not just to stave off hunger, but to stave of boredom. They eat for comfort, for entertainment. They just eat. Instead of exercising, they eat. The paradox is that their caloric requirements are lower because they are spending more time eating.

    Nobody ever got fat on air. OK, except for the Michelin man.

  8. #28
    I saw something up there about hormonal problems if your BF is too low.I've measured mine once and I was at 3.7%;could this be a reason I'm relatively short?

  9. #29
    My friend had about 4%-6% bodyfat ran 10.27

    Ok this is going to sound so so so crazy. Has anyone read any studies on effect of bodyfat with sauna use. I read an article while I was indosposed the other day. Which stated it takes the bad fat and makes it good. Well I be darned. No seriously can this stuff help with bodyfat. By sweating out fat. JK. By sweating out toxins?

  10. #30
    I think I could make a million dollars on that idea. Sweating out the fat by Tim Lane. Maybe I could beat dr.phill and hillary clinton in book sales?

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