Accessory muscle activation during the superimposed burst technique

Devin Roberts, Christopher Kuenze, Susan Saliba, Joseph M. Hart

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Quadriceps muscle activation is assessed using the superimposed burst technique. This technique involves percutaneous muscle stimulation superimposed during maximal isometric volitional knee extension. It is unknown whether accessory muscle activation during maximal knee extension influences estimates of quadriceps muscle activation. Our aim was to compare accessory muscle activation while performing the superimposed burst technique using investigator delivered verbal instruction to constrain the system (CS) and a participant preferred (PP) technique. Twenty five healthy, active individuals (13M/12F, age = 23.8 ± 3.35, height = 72.73 ± 14.51. cm, and weight = 175.29 ± 9.59. kg) were recruited for this study. All participants performed superimposed burst testing with (CS) and without (PP) verbal instruction to encourage isolated quadriceps activation during maximal isometric knee extension. The main outcome variables measured were knee extension torque, quadriceps central activation ratio and mean EMG of vastus lateralis, biceps femoris, and lumbar paraspinal muscles. There were significant differences in knee extension torque (CS = 2.87 ± 0.93. Nm/kg, PP = 3.40 ± 1.12. Nm/kg, p< 0.001), superimposed burst torque (CS = 3.40 ± 0.98. Nm/kg, PP = 3.75 ± 1.11. Nm/kg, p= 0.002) and quadriceps CAR (CS = 84.1 ± 12.0%, PP = 90.2 ± 9.9%, p< 0.001) between the techniques. There was also a significant difference in lumbar paraspinal EMG (CS = 6.40 ± 8.52%, PP = 11.86 ± 14.89%, p= 0.043) between the techniques however vastus lateralis EMG was not significantly different. Patient instruction via verbal instruction to constrain proximal structures may help patient minimize confounders to knee extension torque generation while maximizing quadriceps activation.

Original languageEnglish (US)
Pages (from-to)540-545
Number of pages6
JournalJournal of Electromyography and Kinesiology
Volume22
Issue number4
DOIs
StatePublished - Aug 2012
Externally publishedYes

Fingerprint

Knee
Quadriceps Muscle
Torque
Muscles
Paraspinal Muscles
Research Personnel
Weights and Measures

Keywords

  • Central activation ratio
  • Electromyography
  • Quadriceps activation

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

Cite this

Accessory muscle activation during the superimposed burst technique. / Roberts, Devin; Kuenze, Christopher; Saliba, Susan; Hart, Joseph M.

In: Journal of Electromyography and Kinesiology, Vol. 22, No. 4, 08.2012, p. 540-545.

Research output: Contribution to journalArticle

Roberts, Devin ; Kuenze, Christopher ; Saliba, Susan ; Hart, Joseph M. / Accessory muscle activation during the superimposed burst technique. In: Journal of Electromyography and Kinesiology. 2012 ; Vol. 22, No. 4. pp. 540-545.
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abstract = "Quadriceps muscle activation is assessed using the superimposed burst technique. This technique involves percutaneous muscle stimulation superimposed during maximal isometric volitional knee extension. It is unknown whether accessory muscle activation during maximal knee extension influences estimates of quadriceps muscle activation. Our aim was to compare accessory muscle activation while performing the superimposed burst technique using investigator delivered verbal instruction to constrain the system (CS) and a participant preferred (PP) technique. Twenty five healthy, active individuals (13M/12F, age = 23.8 ± 3.35, height = 72.73 ± 14.51. cm, and weight = 175.29 ± 9.59. kg) were recruited for this study. All participants performed superimposed burst testing with (CS) and without (PP) verbal instruction to encourage isolated quadriceps activation during maximal isometric knee extension. The main outcome variables measured were knee extension torque, quadriceps central activation ratio and mean EMG of vastus lateralis, biceps femoris, and lumbar paraspinal muscles. There were significant differences in knee extension torque (CS = 2.87 ± 0.93. Nm/kg, PP = 3.40 ± 1.12. Nm/kg, p< 0.001), superimposed burst torque (CS = 3.40 ± 0.98. Nm/kg, PP = 3.75 ± 1.11. Nm/kg, p= 0.002) and quadriceps CAR (CS = 84.1 ± 12.0{\%}, PP = 90.2 ± 9.9{\%}, p< 0.001) between the techniques. There was also a significant difference in lumbar paraspinal EMG (CS = 6.40 ± 8.52{\%}, PP = 11.86 ± 14.89{\%}, p= 0.043) between the techniques however vastus lateralis EMG was not significantly different. Patient instruction via verbal instruction to constrain proximal structures may help patient minimize confounders to knee extension torque generation while maximizing quadriceps activation.",
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