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Titolo:
Task-related changes of transmission in the pathway of heteronymous spinalrecurrent inhibition from soleus to quadriceps motor neurones in man
Autore:
Iles, JF; Ali, A; 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: 123, anno: 2000,
parte:, 11
pagine: 2264 - 2272
SICI:
0006-8950(200011)123:<2264:TCOTIT>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
RENSHAW CELLS; VESTIBULAR STIMULATION; AXON COLLATERALS; REFLEX PATHWAYS; WALKING; HUMANS; MOTONEURONS; DEPRESSION; MODULATION; AFFERENTS;
Keywords:
recurrent inhibition; spinal cord; motor control; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
26
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 et al., "Task-related changes of transmission in the pathway of heteronymous spinalrecurrent inhibition from soleus to quadriceps motor neurones in man", BRAIN, 123, 2000, pp. 2264-2272

Abstract

An H reflex conditioning technique was used to monitor the transmission ofheteronymous recurrent inhibition from soleus to quadriceps motor neuronesof the human lower limb. Inhibition declined during quadriceps muscle contraction under all conditions examined, falling to zero at around one-third of the maximum voluntary contraction. Inhibition declined during soleus muscle contraction in sitting, standing and bicycling tasks. The level of inhibition assessed at a given (weaker than 30%) level of quadriceps contraction was reduced during postural tasks involving quadriceps and soleus cocontraction (standing and late-stance phase of walking) when compared with sitting and performing matched voluntary muscle contractions. The level of inhibition during the mid-power stroke of a bicycling task, which also involved co-contraction of quadriceps and soleus, was greater than during matched voluntary muscle contractions while sitting, It is concluded that the pathwayof heteronymous recurrent inhibition from soleus to quadriceps motor neurones is under at least two types of control: one related to the task, which sets the operating range, and a second which couples Inhibition to the level of muscle contraction, Multiple control pathways are consistent with the diverse effects on recurrent inhibition reported in subjects with upper motor neurone lesions.

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Documento generato il 28/11/20 alle ore 20:47:19