Future generations of even more maneuverable aircraft will probably necessitate the use of APPB, pilot selection, and high-G seats for protection of pilots from the effect of sustained high G forces. An improved anti-G valve, physical conditioning, high-G awareness briefings, and centrifuge training are now being applied in efforts to prevent GLC in current fighter aircraft. Educational means include briefings on methods of enhancing tolerance, and high-G training in a centrifuge to allow the pilot to perfect his anti-G straining maneuver. Physiological means include frequent exposure to G stress, physical conditioning (weight training and moderate aerobic conditioning), selection of pilots for high natural tolerance, and performance of a vigorous and efficient anti-G straining maneuver. Mechanical means include anti-G suits and valves, assisted positive-pressure breathing (APPB) systems, and special seats in which the seatback is reclined and/or the pilot's legs are elevated. The water is being accelerated toward the center of rotation hard enough to generate a counter (centrifugal) force that keeps it in the bucket. When a bucket full of water is spun around in a horizontal circle on a rope, Gs are what keep the water from spilling out. Means of raising G tolerance fall into three categories: mechanical, physiological, and educational. A G is a multiple of the gravitational pull of Earth. The body's primary natural defenses against the effects of G stress in flight, i.e., the neural tissue energy reserve and the cardiovascular baroceptor reflexes, determine the characteristic shape of the G-time tolerance curve, which is presented. The physiologic effects of high-G stress, including decreased head-level blood pressure due to hydrostatic pressure drop and decreased cardiac output due to inadequate venous return, result in the symptoms of visual loss and GLC. G stress can readily incapacitate pilots of modern fighter aircraft and result in mishaps due to G-induced loss of consciousness (GLC). In the world of aviation this is called a G-LOC, aka G-induced loss of consciousness, and remains a significant cause of loss of aircraft and pilot in both. Air Force tests G-force suits for female pilots By Stephen Losey Women who fly fighter jets or other high-speed aircraft could have a better-fitting and safer G-force suit.
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