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A Comparison of the Inhibitory Response to Tendon and Cutaneous Afferent Stimulation in the Human Lower Limb.
MedLine Citation:
PMID:  22031770     Owner:  NLM     Status:  Publisher    
A powerful early inhibition is seen in triceps surae following transcutaneous electrical stimulation of the Achilles tendon (tendon electrical stimulation; TES). The aim of the current study was to confirm results from surface electromyogram (SEMG) recordings that the inhibition is not wholly or partly due to stimulation of cutaneous afferents that may lie within range of the tendon electrodes. Due to methodological limitations, SEMG does not reliably identify the timecourse of inhibitory and excitatory reflex components. This issue was revisited here using an analysis of changes in single motor unit (SMU) firing rate (peristimulus frequencygram; PSF) and probability (perstimulus time histogram; PSTH) to re-examine the timecourse of inhibitory SMU events that follow purely cutaneous (superficial sural) nerve stimulation. Results were then compared with similar data from TES. When compared with the reflex response to TES, sural nerve stimulation resulted in a longer onset latency of the primary inhibition and a weaker effect on SMU firing probability and rate. PSF also revealed that decreased SMU firing rates persisted during the excitation phase in SEMG, suggesting that the initial inhibition was more prolonged than previously reported. In a further study, the transcutaneous SEMG Achilles tendon response was compared with that from direct intra-tendon stimulation with insulated needle electrodes. This method should attenuate the SEMG response if it is wholly or partly dependent on cutaneous afferents. However subcutaneous stimulation of the tendon produced similar components in the SEMG confirming that cutaneous afferents made little or no contribution to the initial inhibition following TES.
Nigel C Rogasch; John Alexander Burne; Kemal Sitki Turker
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-26
Journal Detail:
Title:  Journal of neurophysiology     Volume:  -     ISSN:  1522-1598     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1The Alfred and Monash University School of Psychology.
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