Paul M A
Acceleration Research Division, Defence and Civil Institute of Environmental Medicine, North York, Ont., Canada.
Aviat Space Environ Med. 1996 Nov;67(11):1028-33.
While both the USAF and the USN have characterized the immediate sequelae of G-induced loss of consciousness (G-LOC) as resulting in approximately 24 s of incapacitation, very little is known about the effect of a G-LOC immediately after this incapacitation period. This study is an attempt to determine the effect of G-LOC on instrument flying performance immediately after G-LOC.
In order to establish their flying performance baselines, 29 Canadian Forces (CF) pilots attending the high sustained G (HSG) course flew 3 iterations of a 15-min instrument flying task on the day prior to their HSG course. All 29 pilots performed this same task the next day within 5 min of completing the centrifuge training. In addition, the pilots who experienced G-LOC flew the task again 45 min after G-LOC. Flying performance was assessed by calculating Root Mean Square (RMS) error on 11 flight parameters. These RMS values were submitted to a multivariate analysis of variance.
Of the 29 pilots, 12 experienced G-LOC during the centrifuge training. The flying performance of the 17 non-G-LOC pilots was not affected by their exposure to HSG. Of the 12 G-LOC pilots, 11 had no measurable performance decrement while 1 pilot, after a severe G-LOC, stalled and "spun-in" on take-off and then (after being re-established on the outbound radial) could not complete the task. This same pilot flew the task very well 45 min later. This study did not identify a degradation in flying performance after HSG nor after G-LOC except in the 1 pilot.
Whether or not a pilot's flying performance is affected after G-LOC may be related to the severity of the G-LOC. Some pilots may experience seizure activity relating to the G-LOC with a resulting sustained performance decrement that appears to resolve by 45 min. It is possible that some of the other G-LOC pilots in the study might have had measurable performance decrements if we had been able to have them fly the task while they were still in the gondola (i.e., immediately after the G-LOC).
虽然美国空军和美国海军都将重力诱发意识丧失（G-LOC）的直接后遗症描述为导致约24秒的失能状态，但对于失能期过后紧接着出现的G-LOC的影响却知之甚少。本研究旨在确定G-LOC对G-LOC后即刻的仪表飞行性能的影响。
为了确立他们的飞行性能基线，29名参加高持续重力（HSG）课程的加拿大部队（CF）飞行员在HSG课程前一天进行了3次15分钟的仪表飞行任务。所有29名飞行员在完成离心机训练后的第二天5分钟内执行了相同任务。此外，经历过G-LOC的飞行员在G-LOC后45分钟再次执行该任务。通过计算11个飞行参数的均方根（RMS）误差来评估飞行性能。这些RMS值被提交进行多变量方差分析。
29名飞行员中，有12名在离心机训练期间经历了G-LOC。17名未经历G-LOC的飞行员的飞行性能未受其HSG暴露的影响。在12名经历G-LOC的飞行员中，11名没有可测量的性能下降，而1名飞行员在严重的G-LOC后，起飞时失速并“螺旋坠毁”，然后（在重新回到出航径向航线后）无法完成任务。该飞行员在45分钟后很好地完成了任务。除了这1名飞行员外，本研究未发现HSG后或G-LOC后飞行性能下降。
G-LOC后飞行员的飞行性能是否受到影响可能与G-LOC的严重程度有关。一些飞行员可能会经历与G-LOC相关的癫痫活动，导致持续的性能下降，这种下降似乎在45分钟后消失。如果我们能够让研究中的其他一些G-LOC飞行员在仍在吊舱内时（即G-LOC后即刻）执行任务，他们可能会有可测量的性能下降。
