Vestibulospinal influences on lower limb motoneurons

Kennedy, Paul M., Cresswell, Andrew G., Chua, Romeo and Inglis, J. Timothy (2004). Vestibulospinal influences on lower limb motoneurons. In: Canadian Journal of Physiology And Pharmacology. Proceedings of: Nerve, muscle, and beyond: the R.B. Stein Symposium. Canadian Physiological Society (CPS) Winter Meeting 2004: Symposium In Honour Of Professor Richard Stein, Vernon, BC, Canada, (675-681). 29 January-1 February 2004. doi:10.1139/Y04-080


Author Kennedy, Paul M.
Cresswell, Andrew G.
Chua, Romeo
Inglis, J. Timothy
Title of paper Vestibulospinal influences on lower limb motoneurons
Conference name Canadian Physiological Society (CPS) Winter Meeting 2004: Symposium In Honour Of Professor Richard Stein
Conference location Vernon, BC, Canada
Conference dates 29 January-1 February 2004
Convener Canadian Physiological Society
Proceedings title Canadian Journal of Physiology And Pharmacology. Proceedings of: Nerve, muscle, and beyond: the R.B. Stein Symposium   Check publisher's open access policy
Journal name Canadian Journal of Physiology and Pharmacology   Check publisher's open access policy
Place of Publication Ottawa, Ont., Canada
Publisher National Research Council Canada
Publication Year 2004
Sub-type Fully published paper
DOI 10.1139/Y04-080
ISSN 0008-4212
1205-7541
Volume 82
Issue 8-9
Start page 675
End page 681
Total pages 7
Language eng
fre
Formatted Abstract/Summary
Galvanic vestibular stimulation (GVS) is a research tool used to activate the vestibular system in human subjects. When a low-intensity stimulus (1-4 mA) is delivered percutaneously to the vestibular nerve, a transient electromyographic response is observed a short time later in lower limb muscles. Typically, galvanically evoked responses are present when the test muscle is actively engaged in controlling standing balance. However, there is evidence to suggest that GVS may be able to modulate the activity of lower limb muscles when subjects are not in a free-standing situation. The purpose of this review is to examine 2 studies from our laboratory that examined the effects of GVS on the lower limb motoneuron pool. For instance, a monopolar monaural galvanic stimulus modified the amplitude of the ipsilateral soleus H-reflex. Furthermore, bipolar binaural GVS significantly altered the onset of activation and the initial firing frequency of gastrocnemius motor units. The following paper examines the effects of GVS on muscles that are not being used to maintain balance. We propose that GVS is modulating motor output by influencing the activity of presynaptic inhibitory mechanisms that act on the motoneuron pool.
© 2004 NRC Canada
Subjects 1109 Neurosciences
1115 Pharmacology and Pharmaceutical Sciences
1116 Medical Physiology
Keyword Pharmacology & Pharmacy
Physiology
Galvanic vestibular stimulation
H-reflex
Motor unit
Vestibulospinal
Human
Soleus h-reflex
Squirrel-monkey
Electromyographic responses
Hoffmann reflex
Head position
Human gait
Humans
Modulation
Discharge
Q-Index Code E1
Additional Notes Presented as "Vestibulospinal modulation of motor unit recruitment"

 
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Created: Wed, 17 Oct 2007, 23:15:18 EST