The article is devoted to the role of individual psychological sphere in sports activities of an athlete. Mental state is the component of human’s mind and is in dialectical interconnection with it as a part of the whole. It should be taken into account that the main target of psychological training of sportsmen is organization of psychological promptitude to maximum realization of abilities in the competition. The result can be attained by means of mastering the methods of psychological regulation, and the main target of running this process is the mental states. Furthermore, one fact should be emphasized that maximum progress is possible by achieving by the sportsmen of the certain level of mental states that are considerable for specific activity in the current kind of sport. That is why the investigation of components of the system that is mentioned above should be substantial lever in sufficient increase of sport activity. The aim of the article is the determination of prognosis-informative features of athletes’ mental state that can be used to customize their training process and evaluate the success of their training activities. Research methods that were used in the course of research are theoretical analysis and synthesis of scientific and methodological literature, psychological and educational testing, and methods of mathematical processing. Results of the study. Analysis of motivation features gives the possibility to study more differentially the perennial extreme activity of athletes’ high availability for the competition, excessive emotional tension. The practical significance of the results is that the ways of assessment of compliance of athlete mental condition to the particularity and specific tasks of motive activity in the training session are developed. Conclusions and recommendations for further research. Specific features of mental states that have positive or negative impact on the success of motive sports actions are still not revealed
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