1993
DOI: 10.1113/jphysiol.1993.sp019832
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Effect of sympathetic nervous system activation on the tonic vibration reflex in rabbit jaw closing muscles.

Abstract: SUMMARY1. In precollicular decerebrate rabbits we investigated the effect of sympathetic stimulation, at frequencies within the physiological range, on the tonic vibration reflex (TVR) elicited in jaw closing muscles by small amplitude vibrations applied to the mandible um,. The EMG activity was recorded bilaterally from masseter muscle and the force developed by the reflex was measured through an isometric transducer connected with the mandibular symphysis.2. Unilateral stimulation of the peripheral stump of … Show more

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Cited by 33 publications
(17 citation statements)
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“…The consistent enhancement of stretch reflex responsiveness we found contrasts with animal data reporting a decrease in static and dynamic muscle spindle sensitivity during stimulation of the cervical or lumbar sympathetic chain (10,24,27). However, the results from human studies are ambiguous and there may be methodological or species differences.…”
Section: Discussioncontrasting
confidence: 85%
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“…The consistent enhancement of stretch reflex responsiveness we found contrasts with animal data reporting a decrease in static and dynamic muscle spindle sensitivity during stimulation of the cervical or lumbar sympathetic chain (10,24,27). However, the results from human studies are ambiguous and there may be methodological or species differences.…”
Section: Discussioncontrasting
confidence: 85%
“…Sympathetic fibers penetrating the muscle spindle capsule (2) and the presence of adrenergic receptors inside the muscle spindle have been observed (11). Furthermore, sympathetic stimulation during a muscle stretch reduced the dynamic and static components of the stretch reflex response in rabbit and rat jaw muscles (10,24,27), indicating that an increase in sympathetic outflow may depress the feedback control of the muscle reflex system. Accordingly, the functions assigned to the muscle spindle system i.e., motor reflex functions, coordination, and proprioception, could be influenced by sympathetic modulation (27).…”
mentioning
confidence: 98%
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“…They have shown that, in curarized animals, sympathetic stimulation can induce an increase in muscle spindle activity, often preceded by a transient decrease of the firing rate, which is accompanied by a small force development (a few g for all jaw elevator muscles) attributed to sympathetically induced contraction of intrafusal and/or a few extrafusal muscle fibres (Passatore & Filippi, 1981, 1982Passatore, Grassi & Filippi, 1985;Passatore & Grassi, 1989. A reduction of spindle sensitivity to sinusoidal muscle stretch was also reported, which was thought to be responsible for the marked spindle afferents and EMG activity was reduction of both the jaw jerk reflex and the tonic vibration reflex induced by sympathetic stimulation in decerebrate rabbits (Passatore & Grassi, 1989;Grassi, Deriu, Artusio & Passatore, 1993a;Grassi, Deriu & Passatore, 1993b). The jaw jerk reflex is a monosynaptic brainstem reflex; the sensory neurones of muscle spindles (the mesencephalic trigeminal nucleus) make excitatory connections with the motoneurones of the jaw closing muscles (the trigeminal motor nucleus).…”
mentioning
confidence: 99%
“…It is known that a direct sympathetic regulation of the muscle spindle occurs in parallel with the fusimotor regulation of the muscle spindle. Previous studies (Grassi et al 1993, Passatore et al 1985, Roatta et al 2002 have shown that sympathetic stimulation during a muscle stretch can reduce the dynamic and static components of the stretch reflex response in rabbit and rat jaw muscles, indicating that an increase in sympathetic outflow may depress the feedback control of the muscle reflex system. Consequently, the motor reflex functions, coordination, and proprioception, could be influenced by sympathetic modulation (Roatta et al 2002).…”
Section: Introductionmentioning
confidence: 99%