High-g training

Incidents of acceleration-induced loss of consciousness have caused fatal accidents in aircraft capable of sustaining high-g for considerable periods.

The reverse effect is experienced in advanced aerobatic maneuvers under negative g-forces, where excess blood moves towards the brain and eyes ("redout").

This is because when the body accelerates up at such high rates the blood rushes from the brain which causes loss of vision.

This is doubly dangerous because, on recovery as g is reduced, a period of several seconds of disorientation occurs, during which the aircraft can dive into the ground.

A trained, fit individual wearing a g suit and practicing the straining maneuver can, with some difficulty, sustain up to 9 g without loss of consciousness.

Exposure to this simulated gravity would prevent or reduce the bone decalcification and muscle atrophy that affect individuals exposed to long periods of free fall.