Decomposition-enhanced spike-triggered averaging

Contraction level effects

Robin A. Conwit, Brian Tracy, Chris Jamison, Megan McHugh, Dan Stashuk, William F. Brown, E. Metter

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Decomposition-enhanced spike-triggered averaging (DE-STA) was applied to the vastus medialis muscle to examine size distributions of surface-detected motor unit action potentials (S-MUAPs) at various force levels. Using DE- STA, 15-20 S-MUAPs were identified during 5%, 10%, 20%, and 30% of maximum voluntary contraction. Average S-MUAPs showed increase in peak to peak (and negative peak) amplitude with force (in μV): 5% = 37.9 ± 6.1 (16.6 ± 2.5), 10% = 44.0 ± 4.0 (20.4 ± 1.8), 20% = 80.7 ± 9.3 (41.3 ± 4.5), and 30% = 102.5 ± 10.3 (53.6 ± 5.0). Test-retest variability of peak to peak (and negative peak amplitude) between repeated trials was 0.10 (0.14), 0.14 (0.14), 0.17 (0.15), and 0.21 (0.20) at 5%, 10%, 20%, and 30% respectively. A relationship was found between the S-MUAP amplitude and force (r2 = 0.78, df = 90, F = 160, P < 0.001). Increase in average S-MUAP amplitude with force suggests that STA performed only at low levels of contraction may result in a biased sampling and small average S-MUAP amplitudes.

Original languageEnglish (US)
Pages (from-to)976-982
Number of pages7
JournalMuscle and Nerve
Volume20
Issue number8
DOIs
StatePublished - Aug 2 1997
Externally publishedYes

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Action Potentials
Quadriceps Muscle
Muscles

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)

Cite this

Decomposition-enhanced spike-triggered averaging : Contraction level effects. / Conwit, Robin A.; Tracy, Brian; Jamison, Chris; McHugh, Megan; Stashuk, Dan; Brown, William F.; Metter, E.

In: Muscle and Nerve, Vol. 20, No. 8, 02.08.1997, p. 976-982.

Research output: Contribution to journalArticle

Conwit, Robin A. ; Tracy, Brian ; Jamison, Chris ; McHugh, Megan ; Stashuk, Dan ; Brown, William F. ; Metter, E. / Decomposition-enhanced spike-triggered averaging : Contraction level effects. In: Muscle and Nerve. 1997 ; Vol. 20, No. 8. pp. 976-982.
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