Document Detail


In-flight cerebral oxygen status: continuous monitoring by near-infrared spectroscopy.
MedLine Citation:
PMID:  10685593     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Little is known about the in-flight cerebral oxygen status (COS) of fighter pilots. The purpose of this study was to evaluate the COS of fighter pilots during an F-15DJ flight. METHODS: Three male F-15DJ fighter pilots volunteered to serve as test subjects during aerial gunnery training (AGT) missions. During the flight, the pilots' COS was continuously monitored from the right forehead using a NIRO-300G near-infrared spectrophotometer. This new instrument is capable of measuring the concentration changes in the brain of oxygenated hemoglobin (O2Hb), reduced hemoglobin (HHb), total hemoglobin (cHb, O2Hb + HHb), and the tissue oxygenation index (TOI, O2Hb/cHb). RESULTS: Continuous changes of COS within the brain were clearly demonstrated using NIRO-300G, the changes included reductions in O2Hb, cHb, and TOI with increased +Gz, in a mirror image fashion. The maximum decreased concentration of hemoglobin during flight ranged from 12.8 to 25.6 micromol x L(-1) (of brain tissue). CONCLUSIONS: We believe this study is the first monitoring of COS during F-15 actual flight. The monitoring of COS during F-15 flight showed that the effect of +Gz was to simultaneously lower blood flow in a mirror image fashion. Our results demonstrated that near-infrared spectroscopy (NIRO-300G) provides a reliable and sensitive method for the monitoring of pilots' COS during flight.
Authors:
A Kobayashi; Y Miyamoto
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  71     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-02     Completed Date:  2000-03-02     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  177-83     Citation Subset:  IM; S    
Affiliation:
Aeromedical Laboratory, Japan Air Self Defense Force, Tachikawa-shi, Tokyo.
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MeSH Terms
Descriptor/Qualifier:
Acceleration / adverse effects
Adult
Aerospace Medicine / methods*
Brain Chemistry*
Cerebrovascular Circulation / physiology
Humans
Hypergravity / adverse effects
Hypoxia, Brain / diagnosis*,  etiology,  metabolism,  physiopathology
Japan
Male
Military Personnel*
Monitoring, Physiologic / instrumentation,  methods*
Oxygen Consumption
Oxyhemoglobins / analysis*
Reproducibility of Results
Sensitivity and Specificity
Spectroscopy, Near-Infrared / methods*
Chemical
Reg. No./Substance:
0/Oxyhemoglobins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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