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Consciousness monitoring using near-infrared spectroscopy (NIRS) during high +Gz exposures
Journal article   Peer reviewed

Consciousness monitoring using near-infrared spectroscopy (NIRS) during high +Gz exposures

Han C. Ryoo, Hun H. Sun, Barry S. Shender and Leonid Hrebien
Medical engineering & physics, v 26(9), pp 745-753
2004
DOI: https://doi.org/10.1016/j.medengphy.2004.07.003
PMID: 15564111
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Acceleration stress Gz-induced loss of consciousness (G-LOC) Near-infrared spectroscopy (NIRS) Oxygen saturation
The relationship between human consciousness and oxygen saturation (rSO 2) in cerebral tissue under high +Gz stress was non-invasively monitored by near-infrared multiple wavelength spectroscopy (NIRS). We studied the drop in rSO 2 levels in human subjects during exposure to various head-to-foot acceleration (+Gz) profiles. These profiles included sustained +Gz plateaus and repeated short duration +Gz pulses of varying duration. The end point in this study was +Gz-induced loss of consciousness (G-LOC). The rSO 2 levels under normal (asymptomatic), almost loss of consciousness (A-LOC) and G-LOC conditions were recorded. Correlations among decrease in rSO 2, +Gz pulse duration, +Gz stress level and incapacitation time (ICAP) after G-LOC were also investigated. It was found that once rSO 2 fell to a certain level, G-LOC occurred. This threshold was repeatable and independent of the +Gz level or duration. It was also observed that the total ICAP after G-LOC was dependent on the length of time that rSO 2 remained below the G-LOC threshold level, i.e. the longer the rSO 2 level remained below the G-LOC induction level, the longer the subject remained unconscious. These results may prove to be useful in designing closed loop control systems for personal protective gear for pilots of high performance aircraft.

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14 citations in Web of Science
20 citations in Scopus

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UN Sustainable Development Goals (SDGs)

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#3 Good Health and Well-Being

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Collaboration types
Domestic collaboration
Web of Science research areas
Engineering, Biomedical
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