Linked Life Data

2797458

Source:http://linkedlifedata.com/resource/pubmed/id/2797458

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1989-11-9
pubmed:abstractText
We examined suppression of EMG activity in the contracting sternocleidomastoid muscles, produced by electrical stimulation of the supraorbital nerve in 10 normal subjects and 9 patients with spasmodic torticollis. This exteroceptive reflex in the sternocleidomastoid muscle consisted of 2 or 3 phases: (1) an early, small, and unstable phase of facilitation, followed by (2) a period of suppression beginning 35 msec after the stimulus, lasting for 35 msec with a reduction in EMG activity to approximately 40% of the prestimulus level, and (3) a further phase of facilitation at a latency of 70 msec, with duration 35 msec and an increase in EMG activity to approximately 35% above prestimulus levels. The latency and duration of the suppressive phase of this reflex were similar to the exteroceptive suppression of EMG activity in the masseter muscle after supraorbital nerve stimulation (masseter silent period). In patients with spasmodic torticollis, the depth of this exteroceptive suppression in the sternocleidomastoid muscles was less than that observed in an age-matched cohort of normal subjects, although the latency and duration were normal. In contrast, exteroceptive suppression in the masseter muscle was normal. These findings suggest abnormal function of inhibitory interneuronal networks between the 5th cranial nerve and the motor neurons of the spinal accessory and upper cervical nerves which mediate exteroceptive suppression in the sternocleidomastoid muscle in patients with spasmodic torticollis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0028-3878
pubmed:author
pubmed:issnType
Print
pubmed:volume
39
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1354-8
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
An exteroceptive reflex in the sternocleidomastoid muscle produced by electrical stimulation of the supraorbital nerve in normal subjects and patients with spasmodic torticollis.
pubmed:affiliation
MRC Human Movement and Balance Unit, Institute of Neurology, Queen Square, London, England.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't