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A condition of extreme prostration, associated with sudden loss of consciousness due to faulty circulation such as might occur from a defective heart, shock, or haemorrhage. Although the collapse of an athlete following strenuous activity may be physiological (for example, a marathon runner who stops suddenly at the end of a race may collapse because of the pooling of blood in the legs), any collapse should be investigated completely to eliminate sinister causes.

Subjects: Sports and Exercise Medicine.

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