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晕厥是由于脑血流暂时降低或血中化学物质变化所致的意识短暂紊乱和意识丧失。据了解,健康的青年男子中约有25—30%的人都发生过晕厥;运动员在运动中或后发生晕厥并非少见,往往发生在大强度训练或激烈比赛中或后。晕厥发生的危险性不是引起晕厥的病变,而是在晕厥发生刹那间由于摔倒后造成的外伤或骨折。运动的特殊环境如空中、水下和高原,以及运动时速度、力量和方位的迅速变化,突发的意识丧失会导致严重的后果如头颅外伤、溺水和窒息,
Syncope is a transient disturbance of consciousness and loss of consciousness due to a transient decrease in cerebral blood flow or changes in blood chemistry. It is understood that about 25-30% of healthy young men have syncope; athletes during or after exercise syncope is not uncommon, often occurs in intensive training or intense competition or after. The risk of syncope is not the cause of syncope of the lesion, but in an instant syncope occurred due to fall or injury caused by trauma. Special circumstances of exercise such as air, water and the plateau, and rapid changes in speed, strength and orientation during exercise, sudden loss of consciousness can lead to serious consequences such as head trauma, drowning and asphyxia,