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The inability to adequately assess overall temperature in contradictory thermal conditions is problematic for monitoring the safety and comfort of the astronaut during extended EVA. A nonuniform heating/cooling system applied to the surface of the body provides a paradigm for identifying the most sensitive areas for measuring overall heat status. Manipulating warming /cooling tube patterns in the space suit during EVA has potential in providing a normal heat topography. Systematically varying astronaut's heat exchange onboard can enhance comfort and performance and prevent health problems that accompany living in a closely-controlled, constant environmental habitat.