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Titolo:
Changes in transmission in the pathway of heteronymous spinal recurrent inhibition from soleus to quadriceps motor neurons during movement in man
Autore:
Iles, JF; Pardoe, J;
Indirizzi:
Univ Oxford, Dept Zool, Oxford OX1 3PS, England Univ Oxford Oxford England OX1 3PS d, Dept Zool, Oxford OX1 3PS, England
Titolo Testata:
BRAIN
, volume: 122, anno: 1999,
parte:, 9
pagine: 1757 - 1764
SICI:
0006-8950(199909)122:<1757:CITITP>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN LOWER-LIMB; COUPLED RENSHAW CELLS; H-REFLEX; CONTRACTIONS; MOTONEURONS; MUSCLES; FACILITATION; MODULATION; DISCHARGE; AFFERENTS;
Keywords:
recurrent inhibition; spinal cord; motor control; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Iles, JF Univ Oxford, Dept Zool, S Parks Rd, Oxford OX1 3PS, England Univ Oxford S Parks Rd Oxford England OX1 3PS d OX1 3PS, England
Citazione:
J.F. Iles e J. Pardoe, "Changes in transmission in the pathway of heteronymous spinal recurrent inhibition from soleus to quadriceps motor neurons during movement in man", BRAIN, 122, 1999, pp. 1757-1764

Abstract

H reflexes were induced in the human quadriceps muscle by electrical stimulation of the femoral nerve. The reflexes were conditioned by prior stimulation of the inferior soleus nerve, The conditioning stimulus produced an inhibition of long duration (>20 ms). The threshold of this inhibition was atzero soleus motor discharge and the inhibition scaled with soleus motor discharge. It was concluded that the inhibition was a heteronymous recurrent inhibition of quadriceps motor neurons mediated by Renshaw cells which had been activated by soleus motor neuron discharge. This recurrent inhibition declined during voluntary tonic contraction of the quadriceps, falling to zero at around one-third of maximum voluntary contraction. Antagonist contraction and weak co-contraction of the quadriceps and its antagonists did notlead to any significant change in recurrent inhibition. It is concluded that motor commands descending from the brain reduce heteronymous recurrent inhibition during isolated quadriceps muscle contraction, but to a much lesser extent during co-contraction. No evidence was obtained for any descending facilitation of heteronymous recurrent inhibition.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 22:08:54