[Changes in motor neuron excitability during the organization of voluntary movements].
In healthy subjects, H-testing revealed no specific changes of motoneuron excitability during the latency period of voluntary motor activity of movement agonist whereas the H-reflex was augmented prior to movements triggered by a sound signal, the augmentation being the result of the sound activating effect mainly (startle--response). Sharp augmentation of the H-reflex occurs at the beginning of agonist voluntary activation due to interaction between the reflex and the voluntary muscular activities (interaction of peripheral and supraspinal effects on the motoneurons).
D003463:Cues; D004576:Electromyography; D006801:Humans; D008027:Light; D009046:Motor Neurons / Q000502:physiology*; D009068:Movement; D011930:Reaction Time / Q000502:physiology; D012018:Reflex / Q000502:physiology*; D012023:Reflex, Monosynaptic; D013216:Reflex, Startle / Q000502:physiology*; D013016:Sound; D013116:Spinal Cord / Q000502:physiology*
Izmenenie vozbudimosti motoneĭronov v period organizatsii proizvol'nykh dvizheniĭ.