The human organism testing in conditions of modern scientific and technical progress constant stressful influences (industrial, social, psycho-emotional) was carried out for continuous adaptation to the environment: changing of the level of functioning of separate systems and a corresponding tension of regulatory mechanisms occurred. In the article, theoretical bases and methodology of studying the adaptable capacities of the organism are considered. The prenosological diagnostics was used for studying functional conditions on the verge of norm and pathology. The heart rate variability analysis was used based on mathematical model of functional conditions. Concrete technologies and results of evaluation of the adaptation capacities of the organism in space and aviation medicine are presented as well as in applied physiology.
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