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Task-dependent effects evoked by foot muscle afferents on leg muscle activity in humans

Abbruzzese, Michele ; Rubino, Vitoantonio ; Schieppati, Marco

Electroencephalography and clinical neurophysiology, 1996-08, Vol.101 (4), p.339-348

Amsterdam: Elsevier Ireland Ltd

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Título:
Task-dependent effects evoked by foot muscle afferents on leg muscle activity in humans
Autor: Abbruzzese, Michele ; Rubino, Vitoantonio ; Schieppati, Marco
Assuntos: Adult ; Afferent Pathways - physiology ; Biological and medical sciences ; Cutaneous modulation ; Electric Stimulation ; Electromyography ; Fundamental and applied biological sciences. Psychology ; Human ; Humans ; Leg - physiology ; Male ; Middle Aged ; Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration ; Muscle Contraction - physiology ; Proprioception ; Reflex - physiology ; Reflexes ; Synergistic muscles ; Task Performance and Analysis ; Vertebrates: nervous system and sense organs
É parte de: Electroencephalography and clinical neurophysiology, 1996-08, Vol.101 (4), p.339-348
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
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Descrição: The effect of low intensity electrical stimulation of the posterior tibial nerve (PTN) at the ankle on the active triceps surae (TS) muscles was studied in normal subjects, both in a prone position and while standing. PTN stimulation regularly evoked the H-reflex in the flexor digitorum brevis and, in the prone position, a short-latency facilitatory effect in the soleus muscle. During standing, the facilitatory effect was preceded by a clear-cut reduction in electromyograph (EMG) activity. The inhibition-facilitation sequence was evoked in the gastrocnemii under both conditions, on average, though individual differences were present. An EMG modulation similar to that observed under standing conditions was present also in the prone position when subjects pressed the sole of the foot against the wall. Stimulation of sural or digital nerves did not evoke similar effects. It is concluded that foot muscle afferents establish oligosynaptic connections transmitting mixed effects to the TS motoneuronal pool, and that contact with the sole of the foot plays an enabling role for the inhibitory pathway directed to the soleus muscle.
Editor: Amsterdam: Elsevier Ireland Ltd
Idioma: Inglês

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Task-dependent effects evoked by foot muscle afferents on leg muscle activity in humans

Abbruzzese, Michele ; Rubino, Vitoantonio ; Schieppati, Marco

Amsterdam: Elsevier Ireland Ltd

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