title: Surface EMG of the lumbar part of the erector trunci muscle in patients with fibromyalgia.
abstract: OBJECTIVE
  To determine differences supposed in EMG parameters of the erector trunci region between patients with fibromyalgia and healthy subjects during defined investigation situations.
  
  
  METHODS
  During sitting and standing in upright position surface EMG (SEMG) from 15 subjects with fibromyalgia and 10 healthy controls was performed using a 16-channel technique where the electrodes were applied in a well-defined grid pattern (gain 5000, 3 db points at 5 Hz and 700 Hz respectively). SEMG quantification was done by Fourier algorithm using 512 measurement points for calculation.
  
  
  RESULTS
  An increased EMG amplitude could be recorded during rest in fibromyalgia patients compared with controls. Spatial amplitude differences (frequency range 100-500 Hz) in the low back region were significantly (p < 0.01) decreased in the patients' group during sitting.
  
  
  CONCLUSIONS
  It is the first time that a decreased difference in EMG amplitude of different parts within a certain muscle could be proven in patients with fibromyalgia. As far as is known from the literature this result seems to be a uniquefinding in fibromyalgia patients.
authors.affiliation: Motor Research Group, Institute of Pathophysiology University of Jena, Medical Center, Germany. cand@moto.uni-jena.de
authors.forename: C
authors.initials: C
authors.lastname: Anders
authors.forename: H
authors.initials: H
authors.lastname: Sprott
authors.forename: H C
authors.initials: HC
authors.lastname: Scholle
mesh_terms: D004576:Electromyography / Q000295:instrumentation / Q000379:methods; D005260:Female; D005356:Fibromyalgia / Q000503:physiopathology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008161:Lumbosacral Region / Q000503:physiopathology*; D018482:Muscle, Skeletal / Q000503:physiopathology*; D011187:Posture / Q000502:physiology