Test-retest reliability of wide-pulse high-frequency neuromuscular electrical stimulation evoked force

Muscle Nerve. 2018 Jan;57(1):E70-E77. doi: 10.1002/mus.25747. Epub 2017 Aug 9.


Introduction: We compare forces evoked by wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (NMES) delivered to a nerve trunk versus muscle belly and assess their test-retest intraindividual and interindividual reliability.

Methods: Forces evoked during 2 sessions with WPHF NMES delivered over the tibial nerve trunk and 2 sessions over the triceps surae muscle belly were compared. Ten individuals participated in 4 sessions involving ten 20-s WPHF NMES contractions interspaced by 40-s recovery. Mean evoked force and force time integral of each contraction were quantified.

Results: For both nerve trunk and muscle belly stimulation, intraindividual test-retest reliability was good (intraclass correlation coefficient > 0.9), and interindividual variability was large (coefficient of variation between 140% and 180%). Nerve trunk and muscle belly stimulation resulted in similar evoked forces.

Discussion: WPHF NMES locations might be chosen by individual preference because intraindividual reliability was relatively good for both locations. Muscle Nerve 57: E70-E77, 2018.

Keywords: evoked force reliability; extra force; interindividual variability; intraindividual variability; sustained activity.

MeSH terms

  • Adult
  • Electric Stimulation*
  • Electromyography
  • Female
  • H-Reflex / physiology
  • Humans
  • Individuality
  • Male
  • Muscle Contraction / physiology*
  • Muscle Fatigue / physiology
  • Muscle, Skeletal / innervation*
  • Muscle, Skeletal / physiology*
  • Recruitment, Neurophysiological
  • Reproducibility of Results