Americans' Heads Getting Bigger In Size, Changing Shape, Anthropologists Say

Discussion in 'The Bar' started by Magnificent Mr. Hole, Jun 1, 2012.

  1. Magnificent Mr. Hole

    Magnificent Mr. Hole Well-Known Member

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    http://www.utk.edu/tntoday/2012/05/30/american-heads-getting-larger/

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    White Americans’ heads are getting bigger. That’s according to research by forensic anthropologists at the University of Tennessee, Knoxville.

    Lee Jantz, coordinator of UT’s Forensic Anthropology Center (FAC); Richard Jantz, professor emeritus and former director of the FAC; and Joanne Devlin, adjunct assistant professor, examined 1,500 skulls dating back to the mid-1800s through the mid-1980s. They noticed US skulls have become larger, taller, and narrower as seen from the front and faces have become significantly narrower and higher.

    The researchers cannot pinpoint a reason as to why American head shapes are changing and whether it is primarily due to evolution or lifestyle changes.

    “The varieties of changes that have swept American life make determining an exact cause an endlessly complicated proposition,†said Lee Jantz. “It likely results from modified growth patterns because of better nutrition, lower infant and maternal mortality, less physical work, and a breakdown of former ethnic barriers to marriage. Which of these is paramount we do not know.â€

    The researchers found that the average height from the base to the top of the skull in men has increased by eight millimeters (0.3 inches). The skull size has grown by 200 cubic centimeters, a space equivalent to a tennis ball. In women, the corresponding increases are seven millimeters and 180 cubic centimeters.

    Skull height has increased 6.8 percent since the late 1800s, while body height has increased 5.6 percent and femur length has only increased about 2 percent. Also, skull height has continued to change whereas the overall heightening has recently slowed or stopped.

    The scientists also noted changes that illustrate our population is maturing sooner. This is reflected in the earlier closing of a separation in the bone structure of the skull called the spheno-occipital synchondrosis which in the past was thought to fuse at about age twenty. Richard Jantz and Natalie Shirley, an adjunct assistant professor at the FAC, have found the bone is fusing much earlier—14 for girls and 16 for boys.

    America’s obesity epidemic is the latest development that could affect skeletal shape but its precise effects are unclear.

    “This might affect skull shape by changing the hormonal environment, which in turn could affect timing of growth and maturation,†said Richard Jantz. “We know it has an effect on the long bones by increasing muscle attachment areas, increasing arthritis at certain joints, especially the knee, and increasing the weight bearing capacity.â€

    The research only assessed Americans of European ancestry because they provided the largest sample sizes to work with. Richard Jantz said changes in skeletal structure are taking place in many parts of the world, but tend to be less studied. He said research has uncovered shifts in skull shape in Europe though it is not as dramatic as seen in the US.

    The findings were presented on April 14 in Portland, Oregon, at the annual meeting of the American Association of Physical Anthropologists.
     
  2. TripTo My Taint

    TripTo My Taint Well-Known Member

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    Cock heads?
     
  3. Mur

    Mur soon VIP

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    That guy in the pic has a big gigantic head.
     
  4. cheezedbyfate

    cheezedbyfate Well-Known Member

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    its cuz of all the i.r. breeding????
    bbc n shi.....
     
  5. ChuckZ

    ChuckZ You're so pusillanimous, oh yea.

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    very disturbing pic, whoever it is
     
  6. beatlejaws

    beatlejaws nowhere poster

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    poor son of a bitch
     
  7. banksy

    banksy You wrote "I love you" in lipstick on the mirror VIP

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    Baltimore Mike (srs)
     
  8. cheezedbyfate

    cheezedbyfate Well-Known Member

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    i'd like to see a side by side comparison including mike ,schmoopy,and a human....
     
  9. stripes

    stripes Active Member Banned User

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    he's got ass-wiping problems with those little t-rex arms.
     
  10. beatlejaws

    beatlejaws nowhere poster

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    i figured everyone knew
     
  11. gwartney

    gwartney Unafilliated Gold

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    :jj:
     
  12. ChuckZ

    ChuckZ You're so pusillanimous, oh yea.

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    bump
     
  13. ilovebacon

    ilovebacon Well-Known Member VIP

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    That guy's got crabs. :secret:
     
  14. HeinousMark

    HeinousMark Creepy-Ass Cracka VIP

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    Matthew would tell us that Evolution and Anthropology are lies...
     
  15. ChuckZ

    ChuckZ You're so pusillanimous, oh yea.

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    Mike's head is distorting the statistics.
     
  16. Magnificent Mr. Hole

    Magnificent Mr. Hole Well-Known Member

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    :eek: