SubscribeDr Edwin Liem, of the University of Louisville in Kentucky, studied the effects of an inhaled anaesthetic called desflurane on women between the ages of 19 and 40.So their bodies, which presumably couldn't lie about this, were telling the doctor, "Shit, that hurts!" earlier than the bodies of women with other hair colors in the same circumstances. It's genetic.
Their physical responses to the drug were closely monitored. In particular, Dr Liem looked out for unconscious reflex arm or leg movements in response to painful stimulation.
He found that women with red hair needed more of the drug to stop these reflex movements compared to those with dark or blond hair.
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posted by mcwetboy at 11:59 AM on December 7, 2005