Modulation of the soleus H-reflex following galvanic vestibular stimulation and cutaneous stimulation in prone human subjects

2009 ◽  
Vol 40 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Catherine R. Lowrey ◽  
Leah R. Bent
Keyword(s):  
Human Subjects ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
H Reflex ◽  
Cutaneous Stimulation

Influence of the intensity of galvanic vestibular stimulation and cutaneous stimulation on the soleus H-reflex in healthy individuals

Neuroreport ◽  
2018 ◽  
Vol 29 (13) ◽  
pp. 1135-1139 ◽  
Author(s):  
Yohei Okada ◽  
Tomoyuki Shiozaki ◽  
Junji Nakamura ◽  
Yuji Azumi ◽  
Miyo Inazato ◽  
...  
Keyword(s):  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
H Reflex ◽  
Healthy Individuals ◽  
Cutaneous Stimulation

Vestibulospinal influences on lower limb motoneurons

2004 ◽  
Vol 82 (8-9) ◽  
pp. 675-681 ◽  
Author(s):  
Paul M Kennedy ◽  
Andrew G Cresswell ◽  
Romeo Chua ◽  
J Timothy Inglis
Keyword(s):  
Lower Limb ◽  
Human Subjects ◽  
Motor Units ◽  
Vestibular Stimulation ◽  
Firing Frequency ◽  
Galvanic Vestibular Stimulation ◽  
H Reflex ◽  
Free Standing ◽  
Lower Limb Muscles ◽  
Limb Muscles

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.Key words: galvanic vestibular stimulation, h-reflex, motor unit, vestibulospinal, human.

Subsensory galvanic vestibular stimulation augments arterial pressure control upon head-up tilt in human subjects

2012 ◽  
Vol 166 (1-2) ◽  
pp. 66-71 ◽  
Author(s):  
Kunihiko Tanaka ◽  
Chikara Abe ◽  
Yuzuru Sakaida ◽  
Mitsuhiro Aoki ◽  
Chihiro Iwata ◽  
...  
Keyword(s):  
Arterial Pressure ◽  
Human Subjects ◽  
Pressure Control ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Head Up Tilt

scholarly journals Galvanic Vestibular Stimulation Produces Cross-Modal Improvements in Visual Thresholds

2021 ◽  
Vol 15 ◽  
Author(s):  
Jamie L. Voros ◽  
Sage O. Sherman ◽  
Rachel Rise ◽  
Alexander Kryuchkov ◽  
Ponder Stine ◽  
...  
Keyword(s):  
White Noise ◽  
Stochastic Resonance ◽  
Human Subjects ◽  
Vestibular Stimulation ◽  
Galvanic Vestibular Stimulation ◽  
Noise Condition ◽  
Individual Subject ◽  
Auditory Thresholds ◽  
The Cross

BackgroundStochastic resonance (SR) refers to a faint signal being enhanced with the addition of white noise. Previous studies have found that vestibular perceptual thresholds are lowered with noisy galvanic vestibular stimulation (i.e., “in-channel” SR). Auditory white noise has been shown to improve tactile and visual thresholds, suggesting “cross-modal” SR.ObjectiveWe investigated galvanic vestibular white noise (nGVS) (n = 9 subjects) to determine the cross-modal effects on visual and auditory thresholds.MethodsWe measured auditory and visual perceptual thresholds of human subjects across a swath of different nGVS levels in order to determine if some individual-subject determined best nGVS level elicited a reduction in thresholds as compared the no noise condition (sham).ResultsWe found improvement in visual thresholds (by an average of 18%, p = 0.014). Subjects with higher (worse) visual thresholds with no stimulation (sham) improved more than those with lower thresholds (p = 0.04). Auditory thresholds were unchanged by vestibular stimulation.ConclusionThese results are the first demonstration of cross-modal improvement with galvanic vestibular stimulation, indicating galvanic vestibular white noise can produce cross-modal improvements in some sensory channels, but not all.

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