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A DELICATE BALANCE[转载]

发表日期:2008-05-26 摄影器材: 点击数: 投票数:

A  DELICATE  BALANCE

A t the age of 65,walking over a bumpy lawn may be as challenging as balancing on a tightrope. For some reason our balancing reflexes degrade with age.Falls the vest majority among the elderly,accoun for more then 200000 hip fractures a year.

   To better understand the body’s innate “guidance system” and why we se it as weage,Gary Paige of Washington University in St. Lois straps volunteers into a computer driven rotating chair that swivels in 300-degree arcs.With sensors that monitor eye movements, Paige meaaures how fast people’s eyes alter position. This “vestibuloocular reflex,” he says, is a critical instinctive mechanism that enablles us to anchor our balance when the view around us is shifting. It does so by directing the eyes to focus on stable visual targets as the head turns.

   If the reflex were to be diminished or lost,” he says, “a simple dlance down at a curb and back up into the path of travel might upset the balance system.”

  By following the eye movements of volunteers as they spin in his whirling chair, paige has found thant this vestibulo-ocular reflex is slower in older subjects. Teir eyes can “reanchor” on visual cues when the chair moves slowly, but they cannot compensate for swift movements. Paige would like to see whether special eye exercises can help the elderly sharpen this important reflex and reduce their risk of falls.

 

                                                                            From Breakthroughs, December 1990

关键词:微妙的平衡

作者:runze2000

《A DELICATE BALANCE[转载]》


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