title: Collagen and muscle pathology in fibromyalgia patients.
abstract: OBJECTIVE
  To measure collagen concentration and search for muscle pathology in muscle non-tender-point areas from fibromyalgia (FM) patients.
  
  
  METHODS
  Muscle biopsies were obtained from m. vastus lateralis of 27 carefully selected, female fibromyalgia patients, and from eight age-matched female control subjects. Amino acids were determined by HPLC and electron microscopy was performed.
  
  
  RESULTS
  The FM patients had lower hydroxyproline and lower total concentration of the major amino acids of collagen than the controls. No significant difference was seen in the concentration of the major amino acids of myosin or of total protein. Electron microscopy showed no significant differences between FM patients and controls although atrophied muscle fibrils occurred in FM patients only, but frequencies were not significantly different.
  
  
  CONCLUSIONS
  Fibromyalgia patients had a significantly lower amount of intramuscular collagen. This may lower the threshold for muscle micro-injury and thereby result in non-specific signs of muscle pathology.
authors.affiliation: The Parker Institute, Department of Rheumatology, Frederiksberg Hospital, H:S University Hospital, Copenhagen, Denmark.
authors.forename: S T
authors.initials: ST
authors.lastname: Gronemann
authors.forename: S
authors.initials: S
authors.lastname: Ribel-Madsen
authors.forename: E M
authors.initials: EM
authors.lastname: Bartels
authors.forename: B
authors.initials: B
authors.lastname: Danneskiold-Samsoe
authors.forename: H
authors.initials: H
authors.lastname: Bliddal
mesh_terms: D000328:Adult; D000596:Amino Acids / Q000032:analysis; D016022:Case-Control Studies; D003094:Collagen / Q000032:analysis*; D005260:Female; D005356:Fibromyalgia / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D006909:Hydroxyproline / Q000032:analysis; D008055:Lipids / Q000032:analysis; D008854:Microscopy, Electron; D018482:Muscle, Skeletal / Q000737:chemistry* / Q000648:ultrastructure*
chemical_list: D000596:Amino Acids; D008055:Lipids; D003094:Collagen; D006909:Hydroxyproline