Gravity-induced loss of consciousness (GLOC) is the second largest human factors problem facing fighter pilots today. Whinnery, Burton, Boll, and Eddy, (1987) found that the GLOC event consists of a 24-sec period of total incapacitation involving unconsciousness and confusion. A study by Tripp, et al. (2006) found that the GLOC problem was much worse that originally thought with total performance incapacitation lasting for 87 sec. The two studies described herein were designed to decrease the time required to recover from the GLOC event. Toward that end, the first study employed an anti-G suit inflation technique while the second study exposed participants to accessory auditory, visual, and tactile stimulation following GLOC. Both procedures significantly reduced the duration of the GLOC episode but the reductions were not substantial enough to be functionally effective.
References
1.
AlberyW.B.Van PattenR.E. (1991). Non-invasive sensing systems for acceleration-induced physiologic changes. IEEE, Engineering in Medicine and Biology, 10, 5255.
2.
BonhommeV.PlourdeG.MeuretP.FisetP.BeckmanS.B. (2000). Auditory steady state response and vispectral index for assessing level of consciousness during propofol sedation and hypnosis. Anesthesia Analgisa, 91, 13981403.
3.
CorenS.WardL. M.EnnsJ. T. (2004). Sensation & Perception (6th Edition). New York: Wiley.
4.
DeHartR. (1999). Aerospace medicine in perspective: The historical perspective, In DeHartR.L. (Ed.), Fundamentals of Aerospace Medicine (2nd ed., pp. 3–22). Baltimore, MD: Williams & Wilkins.
5.
Department of Defense (1995). Handbook for Engineering Design Guidelines. Redstone Arsenal, Alabama.
6.
Department of Defense (2001) Interface standard: Lighting, Aircraft, Night Vision System Compatible. Mil-STD-3009, Wright-Patterson AFB, OH.
7.
FongK.L. (1992). Maximizing +Gz tolerance in pilots of high performance combat aircraft. (Report No. AL-SR-1993–0001). Wright-Patterson AFB, OH: Armstrong Laboratory.
8.
GauerO. H.ZuidemaG.D. (1961). Circulation in man under gravitational stress. In GauerO. H.ZuidemaG.D. (Eds.) Gravitational stress in aerospace medicine (pp. 43–45). Boston: Little, Brown.
9.
GazzanigaM.S.IvryR.B.MangunG.R. (2002). Cognitive neuroscience: The biology of the mind (2nd ed.). New York: Norton.
10.
HartikainenK.RorariusM.MakelaK.PerakylaJ.VarilaE.JanttiV. (1995). Visually evoked burst during isoflurane anesthesia, British Journal of Anesthesia, 74, 681–685.
11.
JenningsT.SeaworthJ.HowellL.TrippL.D.GoodyearC. (1986). The Effects of Inflation of anti-shock trousers on hemodynamics in normovolemic subjects. Journal of Trauma, 26, 544548.
12.
NäätänenR., (1992). Attention and brain function. Hillsdale, NJ: Erlbaum.
13.
ParadisoS.JohnsonD.L.AndreasenN.C.O'LearyD.S.WatkinsG.L.Boles-PontoL.L.HichwaR.D. (1999). Cerebral blood flow changes associated with attribution of emotional valence to pleasant and unpleasant and neutral visual stimuli in a PET study of normal subjects. American Journal of Psychiatry, 156, 16181629.
14.
PlourdeGVillemureCFisetPBonhommeV.BackmanSB. (1998). Effects of isoflurane on auditory steady state response and on unconsciousness in human volunteers. Anesthesiology, 89, 844851.
15.
PlutchikR. (1994). The psychology and biology of emotion. New York: Harper-Collins.
16.
TalbotL.R.WhitakerHA. (1994). Brain-injured persons in an altered state of consciousness: Measures and intervention strategies. Brain Injury, 8, 689699.
17.
TimmannD.MussoC.FlorianF.K.RijntjesM.JüptnerM.MüllerS.P. (1998). Involvement of the human cerebellum during habituation of the acoustic startle response: A PET study. Journal of Neurology, Neurosurgery and Psychiatry, 65, 771773.
18.
TrippL.D.CheletteT.SavulS.WidmanR.A. (1998). Female exposure to high G: Effects of simulated combat sorties on cerebral and arterial O2 saturation. Aviation, Space, and Environmental Medicine, 69, 869874.
19.
TrippL.D.WarmJ.S.MatthewsG.ChiuP.Y.WerchanP.DeatonJ.E. (2006). +Gz loss of consciousness: Time course of performance deficits with repeated experience. Human Factors, 48, 109120.
20.
WhinneryJ.E.BurtonR.R.BollP.A.EddyD.R. (1987). Characterization of the resulting incapacitation following unexpected +Gz loss of consciousness. Aviation, Space, and Environmental Medicine, 58, 631636.
21.
WoodE.H. (1990). Evolution of anti-G suits, their limitations, and alternative methods for avoidance of G-induced loss of consciousness. Vols. I and II. Defense Advanced Research Project Agency, Strategic Technology Office, Arlington, VA.
