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BDSM Dictionary : Postural asphyxia: history
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Positional asphyxia, also known as postural asphyxia, is a form of asphyxia which occurs when someone's position prevents them from breathing adequately. A small but significant number of people die suddenly and without apparent reason during restraint by police, prison (corrections) officers and health care staff. Positional asphyxia may be a factor in many of these deaths.
It has been hypothesized that historical crucifixion killed its victims by slow positional asphyxia as they became exhausted.
Research has suggested that restraining a person in a face down position is likely to cause greater restriction of breathing than restraining a person face up. Many law enforcement and health personnel are now taught to avoid restraining people face down or to do so only for a very short period of time. Risk factors which may increase the chance of death include obesity, prior cardiac or respiratory problems, and the use of illicit drugs such as cocaine.
Some researchers report that the effects of restraint on oxygen levels is limited, and that other factors must be present to explain sudden deaths during restraint. See Also
(This entry in the BDSM Dictionary incorporates text from the Postural asphyxia article in Wipipedia.)
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