Phonation-related rate coding and recruitment in the genioglossus muscle

K. R. Shumway, D. J. Porfirio, Elizabeth F Bailey

Research output: Contribution to journalArticle

Abstract

Motor unit recruitment was assessed in two muscles with similar muscle fiber-type compositions and that participate in skilled movements: the tongue muscle, genioglossus (GG), and the hand muscle, first dorsal interosseous (FDI). Our primary objectives were to determine in the framework of a voluntary movement whether muscle force is regulated in tongue as it is in limb, i.e., via processes of rate coding and recruitment. Recruitment in the two muscles was assessed within each subject in the context of ramp force (FDI) and in the tongue (GG) during vowel production and specifically, in the context of ramp increases in loudness, and subsequently expressed relative to the maximal. The principle findings of the study are that the general rules of recruitment and rate coding hold true for both GG and FDI, and second, that average firing rates, firing rates at recruitment and peak firing rates in GG are significantly higher than for FDI (P 

Original languageEnglish (US)
Pages (from-to)2133-2140
Number of pages8
JournalExperimental Brain Research
Volume233
Issue number7
DOIs
StatePublished - Apr 22 2015

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Phonation
Muscles
Tongue
Architectural Accessibility
Neurophysiological Recruitment
Extremities
Hand

Keywords

  • Electromyography
  • Motor unit
  • Speech
  • Tongue

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Phonation-related rate coding and recruitment in the genioglossus muscle. / Shumway, K. R.; Porfirio, D. J.; Bailey, Elizabeth F.

In: Experimental Brain Research, Vol. 233, No. 7, 22.04.2015, p. 2133-2140.

Research output: Contribution to journalArticle

Shumway, K. R. ; Porfirio, D. J. ; Bailey, Elizabeth F. / Phonation-related rate coding and recruitment in the genioglossus muscle. In: Experimental Brain Research. 2015 ; Vol. 233, No. 7. pp. 2133-2140.
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