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Purpose: estimation of ubiquity of chronic fatigue among qualified sportsmen of Ukraine in different kinds of sports and determination of specificities of chronic fatigue syndrome’s formation among them. Material: in the research qualified sportsmen of different kinds of sports (n=286) participated. For determination of chronic fatigue degree we used the questionnaire of Leonova. Results: in 104 sportsmen we registered symptoms of chronic fatigue of different degree. Among women symptoms of chronic degree were registered oftener (47.0%), than among men (29.2%). Most of chronic fatigue cases were noticed in swimming, light athletics and football. Formation of chronic fatigue was preceded by certain stages: overtiredness, over tension, over training. In 36.4% of the questioned sportsmen we registered chronic fatigue symptoms of different degree. We offered a model of chronic fatigue and syndrome of chronic fatigue formation in qualified sportsmen. Conclusions: progressing of sportsmen’s chronic fatigue and chronic fatigue syndrome are characterized by gradual appearing of stable or relapsing significant tiredness or by quick tiredness. As a result we can observe reduction of usual activity during long period of time (more than one month).

Ubiquity and formation of chronic fatigue in qualified sportsmen