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aging population of civilian pilots perform aerobatic maneuvers during agricultural (e.g., crop dusting) and entertainment (e.g., air show) flights. These pilots typically do not wear protective equipment such as a G-suit, sometimes experience unsustainably high negative G z for short periods as part of their routines, and may take non-disqualifying cardiovascular medications that could alter G tolerance. While the military has developed computer models (such as Burton’s 2 ) for estimating G tolerance and some symptoms, such software is not readily available as a