The purpose of the research was to study the peculiarities of the presynaptic inhibition of the spinal a-motoneuron at the athletes adapted to the motor activity of a different orientation. The adaptation formed during the long-term training process, specifically influences the expressiveness of the presynaptic inhibition of the spinal a-motoneuron at athletes. The expressiveness of the presynaptic inhibition of the Ia afferents m. soleus and m. quadriceps femoris is more essential at the persons adapted to the complex coordinated and speed-power muscular activity in comparison with the athletes, training on the development of endurance, and depends on the level of sports qualification of the surveyed ones: the more is the level of sports skill, the more is the expressiveness of the presynaptic inhibition of the spinal a-motoneurons.
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