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Determining minimal stimulus intensity for mechanomyographic analysis.

Danijel Tosovic1, Laura Seidl1, Estifanos Ghebremedhin1

  • 1The University of Queensland, School of Biomedical Sciences, Department of Anatomy & Developmental Biology, St. Lucia 4072, Australia.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|July 20, 2015
PubMed
Summary

Sub-maximal percutaneous neuromuscular stimulation (PNS) can accurately measure muscle contraction time (Tc) using mechanomyography (MMG). This approach enhances patient comfort and reduces experiment duration for muscle recovery studies.

Keywords:
Contraction timeInjuryMechanomyographyMuscleStimulation

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Area of Science:

  • Biomedical Engineering
  • Muscle Physiology

Background:

  • Mechanomyography (MMG) shows potential for monitoring muscle injury recovery.
  • Maximal percutaneous neuromuscular stimulation (PNS) can be painful for damaged muscles.

Purpose of the Study:

  • To assess if sub-maximal PNS yields accurate MMG recordings of muscle contraction time (Tc).
  • To investigate the influence of muscle architecture on minimal stimulus intensity.

Main Methods:

  • Investigated six muscles (5 lower limb, 1 dorsal interosseous).
  • Used a 'current ramp' procedure to find minimal stimulus for accurate Tc.
  • Increased current from 30mA in 10mA increments until maximal contraction.

Main Results:

  • 130mA was the highest current needed for accurate Tc in 95% of lower limb muscles.
  • This represents up to a 50% reduction in current for some muscles.
  • Muscle fiber type distribution correlated most strongly with minimum current.

Conclusions:

  • Sub-maximal currents can be used for accurate MMG recordings in future studies.
  • This improves patient comfort and shortens experiment duration.
  • Applicable to both injured and uninjured muscles.