title: Response of pain to static magnetic fields in postpolio patients: a double-blind pilot study.
abstract: OBJECTIVE
  To determine if the chronic pain frequently presented by postpolio patients can be relieved by application of magnetic fields applied directly over an identified pain trigger point.
  
  
  METHODS
  Double-blind randomized clinical trial.
  
  
  METHODS
  The postpolio clinic of a large rehabilitation hospital.
  
  
  METHODS
  Fifty patients with diagnosed postpolio syndrome who reported muscular or arthritic-like pain.
  
  
  METHODS
  Application of active or placebo 300 to 500 Gauss magnetic devices to the affected area for 45 minutes.
  
  
  METHODS
  Score on the McGill Pain Questionnaire.
  
  
  RESULTS
  Patients who received the active device experienced an average pain score decrease of 4.4 +/- 3.1 (p < .0001) on a 10-point scale. Those with the placebo devices experienced a decrease of 1.1 +/- 1.6 points (p < .005). The proportion of patients in the active-device group who reported a pain score decrease greater than the average placebo effect was 76%, compared with 19% in the placebo-device group (p < .0001).
  
  
  CONCLUSIONS
  The application of a device delivering static magnetic fields of 300 to 500 Gauss over a pain trigger point results in significant and prompt relief of pain in postpolio subjects.
authors.affiliation: Department of Family and Community Medicine, Baylor College of Medicine, Houston, TX 77030, USA.
authors.forename: C
authors.initials: C
authors.lastname: Vallbona
authors.forename: C F
authors.initials: CF
authors.lastname: Hazlewood
authors.forename: G
authors.initials: G
authors.lastname: Jurida
mesh_terms: D016009:Chi-Square Distribution; D002908:Chronic Disease; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008280:Magnetics / Q000627:therapeutic use*; D008297:Male; D010146:Pain / Q000209:etiology / Q000503:physiopathology; D059408:Pain Management; D010147:Pain Measurement; D010865:Pilot Projects; D016262:Postpoliomyelitis Syndrome / Q000150:complications*