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Military service is a very specific type of activity, during which the human body can be exposed to a whole range of unfavorable factors of various etiologies. The most difficult period in military service is the initial adaptation period, when the physiological and psychological restructuring of the soldier's body occurs, his adaptation to life and everyday life, to the requirements of the military environment. Adaptation of military personnel to military activities affects the success of this activity, as well as the preservation of the health of military personnel. The study of the features of the process of adaptation to military service seems important for organizing high-quality training of personnel and achieving the ability of military personnel to withstand significant physical and neuropsychic stress. All this also applies to students of military educational institutions. In this case, motivation will be understood as a time-limited psychophysiological process that controls the behavior of an individual, setting its direction, organization, activity and stability; the ability of a person to actively satisfy his needs, while further acting in the interests of the state and society. One of the important areas of this work, which has great practical significance, is the study, assessment and forecasting of the adaptive capabilities of the cadets' body. Most often, psychological diagnostic methods are used to determine the level of adaptation, but recently instrumental research methods, in particular, heart rate variability analysis, have become increasingly widespread.
A.A. et al. (Sun,) studied this question.