by 
kh14n07
ANSWERS: 2
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It varies by person. In general, women or smaller people deal with Gs better. Numbers from NASA and the airforce seem to indicate 13 positive (not sustained) or 9 positive sustained for about 30 seconds without a suit and without passing out. Negative Gs are worse. If you have more than 2-3 sustained, "redout" and pain will result. Yes the amount sustainable by pilots can be increased by behaviour and G-suits. They are trained to squeeze stomach muscles and other muscles to keep blood in their heads. G-suits help by using compressed air to squeeze the legs and lower body of a pilot to keep blood in the head. G-suits don't help for negative Gs and none of this is particularly comfortable.
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To add to the answer by anonymous, the number of G's you can sustain can and will increase with training. First of all, pilots are trained to tense their muscules to squeeze blood to the brain when you are experiencing positive G's (where you are pressed to your seat). Additionally, regular exercise will make your heart stronger and more able to pump blood to your brain.
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