Background. The physical nature of fatigue is complex. Fatigue leads to the depletion of the internal resources of the body. As a result, the pace of work slows down, with accuracy, rhythm and coordination of movements to be disturbed. Freestyle wrestling is a complex sport that imposes a whole complex of strict requirements on athletes, not only physically (strength, physical fitness, endurance, etc.), but also on the psychological and physiological level (using cognitive resources when choosing actions, reaction speed, and features of attention processes in time pressure conditions, etc.). Therefore, it is important to study the effects of physical fatigue on the psychophysiological indicators of wrestlers. The identification of such indicators reflecting the maximized functional conditions for each specific sport and for freestyle wrestling, in particular, will improve the efficiency of training athletes.

The Objective is to study the dynamic development of psychological and psychophysiological indicators in freestyle wrestlers before and after increased physical activity using psychological and electrophysiological methods, as well as to identify possible types of character accentuations in freestyle wrestlers related to the specifics of psychological and psychophysiological presented to this sport requirements. Background. The dynamics of the functional state in freestyle wrestlers was studied before and after increased physical activity. Physical activity was a training session in order to prepare athletes for competitive activity. To study the psychological and psychophysiological indicators of wrestlers, SAN questionnaires of Spielberger-Khanin test were used on a par with electrophysiological methods (EEG). Before training, athletes filled out test forms (SAN, Spilberger-Khanin and Schmishek-Leonhard methods), after which background EEG recording was performed. For statistical data analysis, the Statistica 8 package (for Windows, V 8.0, StatSoft) and the T-test for dependent samples were used. Accentuations of character typical of wrestlers were revealed using K. Leonhard’s (modification of S. Schmishek) method of studying accentuated personalities. We compared the performance of wrestlers of the group with high hypertimity (group 1) and the group with low hypertimity (group 2) in terms of the dynamics of the frequency of theta rhythm and alpha rhythm before and after exercise.

Results. Physical fatigue caused by strong physical exertion significantly affected a decrease in the subjective feeling of well-being, activity, and mood among athletes. In addition, physical fatigue was expressed in a significant decrease in the dominant and average frequency of the theta rhythm in the right hemisphere, as well as in a significant increase in the alpha rhythm in the left hemisphere. Freestyle wrestlers are mainly characterized by a hyper-type character accentuation type associated with mobility and balance of the nervous system, according to the literature. In a state of calm wakefulness, fighters with a hyperthymic type of accentuation are characterized by a low level of anxiety and a low frequency of theta rhythm, which, according to published data, is associated with the activity of the anterior cingulate gyrus, which is involved in the implementation of cognitive processes such as awaiting rewards and making decisions. In the conditions of struggle, there is a sharp increase in the level of anxiety in hyperthymic athletes and a decrease in the dominant frequency of the alpha rhythm in the right hemisphere. Simultaneously, a decrease in the theta rhythm frequency is observed in all wrestlers.

Conclusion. The results obtained allow us to suggest the existence of a certain functional system in freestyle wrestlers, which allows adapting the body’s regulatory systems for the effective implementation of sports activities through the activation of certain brain structures, in particular, the anterior cingulate gyrus. However, this study is pilot (the sample was only 9 athletes), therefore, the results can be illegally extrapolated to a wide selection, but they can be considered as a reserve for further work in this direction.

This research studies the effect of long-term cognitive load on developimg fatigue on a range of subjective, behavioural (reaction time) and electrophysiological (individual alpha rhythm), fatigue index parameters in carriers of various polymorphisms of DRD2 genes. Mental fatigue was modeled as a result of continuous cognitive tasks aimed at using attention and working memory for 2.5 hours.

The sample included 51 subjects (male right-handers, the average age - 20 ± 4 years) whose genetic analysis was conducted and polymorphism options of DRD2 gene Taq1A (A1A1, A1A2 and A2A2) were identified.

The research results show that such load significantly affects almost the entire complex of indicators. Significant differences were found between the polymorphisms carriers A1A1 and A1A2 and A2A2 of DRD2 gene polymorphism in the reaction of choice, and also in fatigue index, which reflects the ratio of slow brain rhythms to fast. The results show the positive role of dopamine in developing fatigue.

Group of A2A2 («A1») polymorphism carriers was assumed to show lower fatigue, characterized in SVMR and PB significantly slower reaction time, and before and after long-term cognitive load, compared with carriers of polymorphisms A1A1 and A1A2 (« A1 + «).

Notably, the dynamics of error increase within all polymorphisms is the same, and genotype number of errors does not vary before or after fatigue. The dynamics of reaction time after the exhaustion of all SNPs is approximately the same. This means that polymorphisms are different not only in dynamics of fatigue but physical predisposition to sensory information processing.