Objective. Development of the system of modern concepts of relativity of the rational use of carbohydrates in athletes during training and competitive process.
Methods. Analysis of research literature and results of own investigations.
Results. The paper highlights statements and problems existing today and related to substantiation of feasibility of carbohydrate support of the training process in athletes of different sports during trainings of various orientations and intensities. In view of metabolic criteria, intake of simple carbohydrates (glucose, fructose) in various quantities is proved for trainings of different duration.
Conclusion. It was found that additional carbohydrates intake is rational not only in cyclic, but also in acyclic sports, because their ingestion not only improves endurance during trainings, but has also positive effect on the realization of sports skills. Key words: carbohydrates, glucose, fructose, motor activity, performance.