For what duration can the body typically survive extreme g forces?

The body can typically survive extreme g forces for short bursts only due to the significant physiological stresses they impose. When experiencing high g forces, such as those encountered in high-speed maneuvering during military aviation or certain extreme sports, the body undergoes a drastic increase in gravitational force that can cause various adverse effects.

During these short bursts, pilot and passenger endurance is limited by factors such as the brain's ability to receive adequate blood flow, which can lead to g-induced loss of consciousness (GLOC) if the forces are too extreme or sustained for longer than the body's adaptations allow. The body's tolerance to g forces can vary based on factors such as conditioning, hydration, and overall health, but it is generally understood that extreme g forces cannot be sustained indefinitely. Limited tolerance is also a primary reason for the existence of g suits, which are designed to counteract the blood pooling effects and help maintain consciousness during those high g maneuvers.

In contrast, prolonged exposure to extreme g forces leads to serious bodily harm and potentially fatal outcomes, clarifying why the notion of extended survival isn't feasible under such conditions. Overall, the complexities of human physiology dictate that short bursts are possible, but longer durations lead to significant risks.