The study points out main energy supply systems functional capabilities of elite cross-country female skiers of various sports specialization (Distance, Universal, Sprint) and at its specific manifestations of formation at different stages of the preparatory period under the influence of strictly regulated training loads construction. The main specific features of achieving the model level of functioning of various sport specialization elite cross-country female skiers main energy supply systems are determined. The results of the study show that the feature functional state formation of skiers at the beginning of the preparatory period in all training groups (Distance, Universal and Sprint) is the low implementation readiness due to the the lactic acid system low level of activity, which was the highest in the group Distance, and combined with a higher level of the oxidative system functioning and the state of intersystem regulation. A feature of skiers-racers functional state formation at the end of the preparatory period is the leveling of differences in the level of physical performance, and in the groups of Universals and Sprint in relation to the group Distance, mainly due to the increase in the power capabilities of the lactic acid energy system. The results can be used to control the training process on the basis of sports training used tools and methods selective training impact to achieve and maintain the model performance capabilities of power supply systems of elite cross-country female skiers at various stages of the Olympic cycle.
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