Whinnery J E, Laughlin M H, Hickman J R
Aviat Space Environ Med. 1979 Jun;50(6):635-8.
Current USAF fighter aircraft easily exceed human physiologic limits with their rapid onset of head-to-foot acceleration forces (+Gz). Sudden in-flight incapacitation caused by these increased +Gz forces could be disastrous with loss of materiel and human life. The physiologic mechanisms responsible for loss of consciousness (LOC) secondary to high +Gz must be fully understood so that maximum protection against it can be provided. An interesting case of an episode of LOC with concurrent sino-atrial block occurring during a relaxed rapid onset (1 G/s) centrifuge run is presented. The patient was undergoing flight medical evaluation for an episode of syncope, etiology unknown. An unusual characteristic of the patient was his high level of endurance training. The possibility of an excessive increase in vagal tone, developed by endurance training, is discussed as a probable etiology for this patient's prolonged time of incapacitation evidenced after +Gz-induced loss of consciousness.
美国空军现役战斗机产生的从头至脚的加速度力（+Gz）迅速增加，很容易超过人体生理极限。这些增加的+Gz力导致的飞行中突然失能可能会造成物资损失和人员伤亡，后果不堪设想。必须充分了解导致高+Gz继发意识丧失（LOC）的生理机制，以便提供最大限度的防护。本文介绍了一个有趣的案例，一名患者在轻松快速启动（1 G/s）的离心机运行过程中发生了LOC并伴有并发的窦房阻滞。该患者因一次不明病因的晕厥发作正在接受飞行医学评估。该患者的一个不寻常特点是其高水平的耐力训练。本文讨论了耐力训练导致迷走神经张力过度增加的可能性，这可能是该患者在+Gz诱发意识丧失后出现长时间失能的病因。
