正加速度引起的意识丧失（ Ｇ Ｌ Ｏ Ｃ） 是当前威胁飞行安全的主要因素。综述了 Ｇ Ｌ Ｏ Ｃ 的机理及其生理监测。慢增长率正加速度导致的意识丧失的机理主要是大脑缺血／ 缺氧；快增长率正加速度导致的意识丧失可能与颅内高应力有关，但缺乏直接的实验证据。用于 Ｇ Ｌ Ｏ Ｃ 监测的生理指标中，眼水平动脉血压、脑氧饱和度等可能具有重要作用 Loss of consciousness due to positive acceleration (G-L O C) is currently a major threat to flight safety. The mechanism of G  L O C and its physiological monitoring are summarized. The mechanism of loss of consciousness caused by slow rate of positive acceleration is mainly cerebral ischemia / hypoxia. Loss of consciousness caused by positive acceleration of fast growth rate may be related to intracranial high stress, but lack of direct experimental evidence. For physiological indicators of G  O-C monitoring, ocular arterial blood pressure, cerebral oxygen saturation may play an important role