title: Trunk isometric force production parameters during erector spinae muscle vibration at different frequencies.
abstract: BACKGROUND
  Vibration is known to alter proprioceptive afferents and create a tonic vibration reflex. The control of force and its variability are often considered determinants of motor performance and neuromuscular control. However, the effect of vibration on paraspinal muscle control and force production remains to be determined.
  
  
  METHODS
  Twenty-one healthy adults were asked to perform isometric trunk flexion and extension torque at 60% of their maximal voluntary isometric contraction, under three different vibration conditions: no vibration, vibration frequencies of 30 Hz and 80 Hz. Eighteen isometric contractions were performed under each condition without any feedback. Mechanical vibrations were applied bilaterally over the lumbar erector spinae muscles while participants were in neutral standing position. Time to peak torque (TPT), variable error (VE) as well as constant error (CE) and absolute error (AE) in peak torque were calculated and compared between conditions.
  
  
  RESULTS
  The main finding suggests that erector spinae muscle vibration significantly decreases the accuracy in a trunk extension isometric force reproduction task. There was no difference between both vibration frequencies with regard to force production parameters. Antagonist muscles do not seem to be directly affected by vibration stimulation when performing a trunk isometric task.
  
  
  CONCLUSIONS
  The results suggest that acute erector spinae muscle vibration interferes with torque generation sequence of the trunk by distorting proprioceptive information in healthy participants.
authors.forename: Jean-Alexandre
authors.initials: JA
authors.lastname: Boucher
authors.forename: Martin C
authors.initials: MC
authors.lastname: Normand
authors.forename: Martin
authors.initials: M
authors.lastname: Descarreaux
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D011434:Proprioception / Q000502:physiology; D012018:Reflex / Q000502:physiology; D013909:Thorax / Q000502:physiology*; D019415:Torque; D014732:Vibration; D055815:Young Adult
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