[Functional reserves of the cardiovascular system in 15-16-year-old girls]. / Funktsional'nye rezervy serdechno-sosudistoi sistemy devochek 15-16 let.

Adaptative cardiovascular responses were examined in 15-16-year-old girls during exercises and higher motivation. The latter promotes the optimization, rationalization, and effectiveness of cardiac performance and the mobilization of the body's functional reserves.

[Dynamics of the infraslow omega potential and of the spatial synchronization of the EEG in muscle fatigue]. / Dinamika sverkhmedlennogo omega-potentsiala i prostranstvennoi sinkhronizatsii EEG pri myshechnom utomlenii.

The object of the present study was the dynamics of infraslow omega-potentials and EEG interrelated activity modifications in young and adult (19-25 years old) sportsmen during strenuous endurance exercise on a cycle-ergometer. Correlation and coherence analysis revealed at the initial stage of muscle fatigue an increase of close relationship (synchronization and in phase readjustment) of different cortical areas potentials mainly between the prefrontal and precentral cortex. It is suggested that this phenomenon is an EEG reflection of voluntary increase of fatigue overcoming. It becomes more pronounced with age and improvement in professional skill. A reliable correlation between omega-potential dynamics and spatial EEG synchronization was found.