Visual dimming experienced during aircraft maneuvering accelerations is an important information source for the simulator pilot. A method for integration of the man with the simulator is demonstrated using computer-based physiologic models and readily measured electromyographic signals arising from the straining maneuver. This technique forces active participation and energy expenditure by the simulator pilot similar to the requirements of the aircraft pilot undergoing acceleration.

Simulation models are developed which relate the effects of the G suit, straining techniques and the cardiovacsular response system to a single protection variable (PV). The PV signal drives a predictive visual field model derived from analysis of the retinal circulation in the eye. Allowances are made for subject variation and cockpit seating configurations.

The model produces accurate predictions of short-term G_z tolerance in its present form and with slight modifications can be adapted to include energetic costs for long-term accelerations.

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