jayrandom: (Default)
[personal profile] jayrandom
Наткнулся на описание процедуры по намеренному вызыванию обморока:

The ‘fainting lark’ classically consists of squatting with the knees fully bent while over-breathing by taking 􏰀20 deep breaths relatively rapidly. The subject then stands up suddenly and performs a forced expiration against a closed glottis (Fig. 4). As such the ‘fainting lark’ involves a combination of many factors: hyperventilation causes peripheral vasodilatation and cerebral vasoconstriction, a sudden shift of blood towards lower parts of the body occurs on standing up from squatting and straining is an impediment to venous return (Howard et al., 1951; Lempert et al., 1994a; Wieling and van Lieshout, 2002). Together these ensure a sudden and severe drop in systemic blood pressure and cerebral perfusion.
The fainting lark has been used by children, high school students and military recruits as entertainment for their friends or to obtain some other gain, such as avoiding imminent examinations (Howard et al., 1951, Johnson et al., 1984). The manoeuvre can evoke unconsciousness of short duration in almost anyone.

-- http://brain.oxfordjournals.org/content/132/10/2630.full.pdf
также см. http://en.wikipedia.org/wiki/Fainting_game


Помню, что в школе в возрасте где-то 11-14 лет мы в это играли. Делалось это у стенки т.н. "рекреации" с помощником, который надавливал на грудь после приседаний с гипервентиляцией. Кажется, нужно было ещё при этом от учителей прятаться.

Похоже, что это международный феномен. Интересно, как давно он просочился в школы?
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