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Effects of sympathetic stimulation on the rhythmic jaw movements produced by electrical stimulation of the rabbit cortical masticatory areas: Possible implication in chronic muscle pain
University of Gävle, Belastningsskadecentrum.
University of Gävle, Belastningsskadecentrum.
University of Gävle, Belastningsskadecentrum.
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2004 (English)In: 4th Forum of European Neuroscience, Lisbon, Portugal, 2004Conference paper, Published paper (Other academic)
Abstract [en]

The somatomotor and sympathetic nervous systems are intimately linked. One example is the influence of peripheral sympathetic fibers on the discharge characteristics of muscle spindles. Since muscle spindles play important roles in various motor behaviors, including rhythmic movements, changes in sympathetic outflow to muscle spindles should change rhythmic movement patterns. We set out to test this hypothesis in the masticatory system of rabbits. Cortically evoked rhythmic jaw movements (CRJMs) and electromyograms (EMGs), induced by long-lasting electrical cortical stimulation, were powerfully modulated by electrical stimulation of the peripheral stump of the cervical sympathetic nerve (CSN). This modulation was characterized by a consistent and marked reduction in the excursion of the mandibular movements (26±10%, mean±STD), often preceded by a transient modest enhancement, which could be mainly attributed to corresponding changes in masseter muscle activity (49±26%). These changes outlasted the duration of CSN stimulation. In some of the CRJMs, changes in masticatory frequency were also observed. When the jaw-closing muscles were subjected to repetitive ramp-and-hold force pulses, the CRMJs changed characteristics. Masseter EMG activity was strongly enhanced (+144±96%) and digastric EMG slightly decreased. This change was considerably depressed during CSN stimulation (to +96±57%). These effects of CSN are similar in sign and time course to the depression exerted by sympathetic activity on the jaw-closing muscle spindle discharge (Roatta et al. 2002). It is suggested that the change in proprioceptive information induced by an increase in sympathetic outflow (i) has important implications for the control of motor function in states of high sympathetic activity, and (ii) is one of the mechanisms responsible for motor impairment under certain pathological conditions such as chronic musculoskeletal head-neck disorders, associated with stress conditions.

Place, publisher, year, edition, pages
2004.
Keywords [en]
Autonomic, limbic and other systems, Stress and the brain, Stress-modulated pathways
Identifiers
URN: urn:nbn:se:hig:diva-942OAI: oai:DiVA.org:hig-942DiVA, id: diva2:117604
Conference
4th Forum of European Neuroscience, July 10-14 2004
Available from: 2007-12-04 Created: 2007-12-04 Last updated: 2018-03-13Bibliographically approved

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Djupsjöbacka, Mats

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CiteExportLink to record
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