G-LOC: When G-Forces Are Too Strong For The Body
Pilots and astronauts both train to endure increased G-forces, and can be exposed to up to 9 G's during testing. G-LOC causes someone to lose consciousness for an average of 12 seconds, and remain disoriented when they wake. They may also have brief convulsions, vivid dreams, or complete amnesia afterwards. G-LOC can be fatal for a pilot flying at low altitude.
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from United States Air Force
Key Facts In This Video
Pilots can train to endure strong G-forces in a specialized centrifuge. (0:09)
Pilots can experience more than 6 G's when they fly, or six times the force of gravity on Earth. (1:02)
An untrained person would probably pass out if they experienced between 4 and 6 G's. (2:35)