Determining minimal stimulus intensity for mechanomyographic analysis

Tosovic, Danijel., Seidl, Laura., Ghebremedhin, Estifanos. and Brown, Mark J. (2015) Determining minimal stimulus intensity for mechanomyographic analysis. Journal of Electromyography and Kinesiology, 25 5: 749-753. doi:10.1016/j.jelekin.2015.06.003

Author Tosovic, Danijel.
Seidl, Laura.
Ghebremedhin, Estifanos.
Brown, Mark J.
Title Determining minimal stimulus intensity for mechanomyographic analysis
Journal name Journal of Electromyography and Kinesiology   Check publisher's open access policy
ISSN 1873-5711
Publication date 2015-10
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jelekin.2015.06.003
Open Access Status Not Open Access
Volume 25
Issue 5
Start page 749
End page 753
Total pages 5
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
Introduction: Mechanomyography (MMG) has recently shown promise in monitoring recovery of injured muscles. However, delivering a maximal percutaneous neuromuscular stimulus (PNS) could potentially be painful on severely damaged muscles. The aim of this paper was to determine whether delivering a sub-maximal PNS could still obtain accurate MMG recordings of muscle contraction time (Tc). The effect of muscle architecture on determining the minimal level of current was also investigated.

Methods: Six muscles were investigated; 5 lower limb and the 1st dorsal interosseous. A ‘current ramp’ procedure was performed to determine minimal stimulus intensity required for accurate Tc recordings. A current ramp entails beginning at a low current (30 mA) and increasing in increments of 10 mA until a maximal muscle contraction is observed.

Results: For lower limb muscles, 130 mA was the largest current required to obtain accurate Tc recordings in at least 95% of the population. This was up to a 50% reduction in the amount of current delivered for some muscles. Fibre type distribution showed the greatest relationship with mean minimum current.

Discussion: Future studies investigating injured or uninjured muscles via MMG, could use these submaximal currents to obtain accurate MMG recordings, whilst improving patient comfort and reducing experiment duration.
Keyword Mechanomyography
Contraction time
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biomedical Sciences Publications
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