Normobaric Hypoxia Symptom Recognition in Three Training Sessions

Normobaric Hypoxia Symptom Recognition in Three Training Sessions

Hypoxia training is mandatory for military pilots, but variability in hypoxia symptoms challenges the training. In a previous study we showed that 64% of pilots recognized hypoxia faster in their second normobaric hypoxia session conducted 2.4 yr after the first. Our aim here was to evaluate whether...

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Bibliographic Details
Published in:Aerospace medicine and human performance Vol. 95; no. 10; p. 758
Main Authors: Leinonen, Antti M, Varis, Nikke O, Kokki, Hannu J, Leino, Tuomo K
Format: Journal Article
Language:English
Published: United States 01-10-2024
Subjects:
Adult
Aerospace Medicine
Female
Humans
Hypoxia - physiopathology
Male
Military Personnel
Oxygen - blood
Pilots
Simulation Training - methods
Young Adult
aviation
military
hypocapnia
normobaric hypoxia
symptoms of hypoxia
simulation
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Summary:Hypoxia training is mandatory for military pilots, but variability in hypoxia symptoms challenges the training. In a previous study we showed that 64% of pilots recognized hypoxia faster in their second normobaric hypoxia session conducted 2.4 yr after the first. Our aim here was to evaluate whether a third session conducted 5.0 yr after the first would provide further benefit. This study was conducted under normobaric conditions in a tactical F/A-18C Hornet simulator in three sessions in which the pilots performed visual identification missions and breathed 21% oxygen in nitrogen. The breathing gas was changed to a hypoxic mixture containing either 8%, 7%, or 6% oxygen in nitrogen without the pilot's knowledge. Data were collected from 102 military pilots. The primary outcome was the time taken for initial identification of hypoxia symptoms. Hypoxia symptoms were recognized on average in the first session in 8% oxygen in 100 s, 7% oxygen in 90 s, and 6% oxygen in 78 s; in the second in 87 s, 80 s, and 71 s, respectively; and in the third in 79 s, 67 s, and 64 s, respectively. In 2 sessions 20 pilots and in each 3 training sessions 3 pilots had slow recognition times. Hypoxia symptom recognition improved the further the repeated normobaric hypoxia training went. More emphasis should be put on the 23% group of slow hypoxia symptom recognizers and more customized hypoxia training for them should be offered. Leinonen AM, Varis NO, Kokki HJ, Leino TK. Normobaric hypoxia symptom recognition in three training sessions. Aerosp Med Hum Perform. 2024; 95(10):758-764.
ISSN:2375-6322
DOI:10.3357/AMHP.6380.2024