title: Normal melatonin levels in patients with fibromyalgia syndrome.
abstract: OBJECTIVE
  To assess urine levels of melatonin measured by 6-sulphatoxymelatonin (aMT6s) in patients with fibromyalgia (FM).
  
  
  METHODS
  Nocturnal aMT6s urine levels were measured by ELISA, in a sample of urine collected from 10 PM to 7 AM from 39 female patients with FM and 39 age matched healthy female controls. All subjects were interviewed and assessed for nonarticular tenderness, FM symptoms, quality of life, and physical functioning.
  
  
  RESULTS
  Nocturnal aMT6s levels of patients with FM were not statistically different from those of controls: 16.7+/-9.2 vs 16.0+/-11.3 microg, respectively. No association was observed between aMT6s levels of patients with FM and disease duration, reproductive status, sleep and mood disturbances.
  
  
  CONCLUSIONS
  Nocturnal urine aMT6s levels were similar in patients with FM and controls. Studies are needed to elucidate the possible role of melatonin in FM and should include larger samples of newly diagnosed untreated patients with FM.
authors.affiliation: Epidemiology Department, Ben-Gurion University of the Negev and Soroka Medical Center, Beer Sheva, Israel.
authors.forename: J
authors.initials: J
authors.lastname: Press
authors.forename: M
authors.initials: M
authors.lastname: Phillip
authors.forename: L
authors.initials: L
authors.lastname: Neumann
authors.forename: R
authors.initials: R
authors.lastname: Barak
authors.forename: Y
authors.initials: Y
authors.lastname: Segev
authors.forename: M
authors.initials: M
authors.lastname: Abu-Shakra
authors.forename: D
authors.initials: D
authors.lastname: Buskila
mesh_terms: D000328:Adult; D005260:Female; D005356:Fibromyalgia / Q000652:urine*; D006801:Humans; D008550:Melatonin / Q000031:analogs & derivatives* / Q000652:urine; D008875:Middle Aged; D010147:Pain Measurement; D011788:Quality of Life; D012016:Reference Values; D013577:Syndrome
chemical_list: C054513:6-sulfatoxymelatonin; D008550:Melatonin