[Elements of the theory of the extreme body state]

A concept of extreme state as a specific physiological category different from the general adaptation syndrome (stress-response), is presented. The extreme state occurs in case of a functional supertask when the price of urgent adaptation of the organism can involve life-threatening. The author presents a bio-economic approach to analysis of redistribution of the energy balance for maintenance of the organism's functioning in a critical situation, and suggests some ways of scientific-practical realisation of this approach.