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A new system has been designed to simulate orbital-extravehicular (EVA) work to provide for real-time measurement of physiological parameters. Such a system described here incorporates an experimental protocol, exercising subject, controlled-atmosphere chamber, EVA-work simulation exercise device, medical instrumentation and a data acquisition system. Applications of the neutral-buoyancy method and other laboratory-simulation methods are described. This information is presented to facilitate the understanding of this exercise device as a possible additional orbital-EVA work-simulation tool. Important engineering issues associated with the design of the proposed system are discussed.

An exercise method has been proposed which may satisfy the current need for a laboratory simulation representative of muscular, cardiovascular, respiratory, and thermoregulatory responses to work during orbital extravehicular activity (EVA). The simulation incorporates arm crank ergometry with a unique body support mechanism that allows all body position stabilization forces to be reacted at the feet. By instituting this exercise method in laboratory experimentation, an advanced portable life support system (PLSS) thermoregulatory control system can be designed to more accurately reflect the specific work requirements of orbital EVA.