Document Detail

Reduced input from foot sole skin through cooling differentially modulates the short latency and medium latency vestibular reflex responses to galvanic vestibular stimulation.
MedLine Citation:
PMID:  22278107     Owner:  NLM     Status:  MEDLINE    
Sensory afferent information from the skin of the foot sole and information from the vestibular system converge within the central nervous system; however, their mode of interaction remains unknown. The purpose of this study was to investigate the effect of reduced cutaneous foot sole information on the ability of the vestibular system to evoke short latency (SL) and medium latency (ML) lower limb muscle reflex responses. Galvanic vestibular stimulation (GVS; bipolar; binaural; 25 ms; 2 mA square-wave pulse) was applied to standing human subjects (four women, eight men, average age 21.1 ± 3.0 years) both before and after cooling the foot soles in 1°C ice water (15 min initially, followed by 5 min between blocks of 200 GVS pulses). Changes in soleus reflex amplitude were examined. Following ice water immersion, there was a 35.16% increase in the size of the ML response in the soleus muscle when expressed as a percentage of pre-stimulus electromyographic (EMG) activity (control 26.48 ± 4.91%; ice 36.16 ± 6.52%) with no change in size of the SL response (control 7.42 ± 1.12%; ice 8.72 ± 1.10%). These results support the previously proposed dissociation of the SL and ML responses with respect to their circuitry and functions. The results also suggest a greater role for cutaneous-vestibular interaction in the modulation of the ML than the SL response and at a location prior to the motoneuron pool.
Stephanie B Muise; Chris K Lam; Leah R Bent
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-26
Journal Detail:
Title:  Experimental brain research     Volume:  218     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-03-29     Completed Date:  2012-12-07     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  63-71     Citation Subset:  IM    
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MeSH Terms
Afferent Pathways / physiology
Electric Stimulation / methods
Feedback, Sensory / physiology*
Foot / innervation,  physiology*
Galvanic Skin Response / physiology*
Mechanoreceptors / physiology*
Muscle, Skeletal / innervation,  physiology*
Postural Balance / physiology*
Reaction Time / physiology*
Skin / innervation
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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