Circadian rhythm disorders, desynchronosis in all its manifestations, including its diagnostics are of interest to scientists in the field of sports medicine, as well as directly to athletes and the entire coaching staff of national teams. This literature review presents domestic and foreign scientific approaches to the study of the basic principles of the work of circadian rhythms in humans, the mechanisms of development and symptoms of desynchronosis, the problems of controlling circadian rhythms in athletes using modern somnological and digital technologies. The use of fitness trackers in athletes and the analysis of the information received is a promising and convenient method requiring attention for further comprehensive study.

Keywords: fitness trackers, biological clock, desynchronosis, circadian rhythms, polysomnography