title: Skin Resistivity Value of Upper Trapezius Latent Trigger Points.
abstract: BACKGROUND
  The skin resistivity (SkR) measurement is commonly recommended for acupoints measurement, but for trigger points (TrPs) only one study is available. The purpose of the study was to evaluate SkR for latent TrPs compared to non-TrPs and the surrounding tissue.
  
  
  METHODS
  Forty-two healthy volunteers with unilateral latent upper trapezius TrPs (12 men, 30 women) aged 21-23 (mean age: 22.1 ± 0.6 y) participated in the study. Keithley electrometer 610B was used for measuring SkR (Ag/AgCl self-adhesive, disposable ground electrode: 30 mm diameter). SkR was measured for latent TrPs and compared to opposite non-TrPs sites and the surrounding tissue.
  
  
  RESULTS
  The SkR decrease of TrPs-positive sites as compared to TrPs-negative sites and the surrounding tissue was confirmed. However, no statistically significant difference in the SkR value occurred when all data were analyzed. The same was confirmed after gender division and for TrPs-positive subjects examined for referred pain and twitch response presence.
  
  
  CONCLUSIONS
  SkR reactive changes at latent TrPs are possible but the results were not consistent with the previous study. Thus, caution in applying SkR to latent TrPs isolation is recommended and its clinical use should not be encouraged yet. Further studies, especially on active TrPs, are yet required.
authors.affiliation: Department of Rheumatology and Rehabilitation, Poznan University of Medical Sciences, 28 Czerwca 1958r., 60-545 Poznań, Poland.
authors.forename: Elżbieta
authors.initials: E
authors.lastname: Skorupska
authors.affiliation: Department of Bionics and Bioimpedance, Poznan University of Medical Sciences, Parkowa 2, 60-775 Poznań, Poland.
authors.forename: Jarosław
authors.initials: J
authors.lastname: Zawadziński
authors.affiliation: Department of Rheumatology and Rehabilitation, Poznan University of Medical Sciences, 28 Czerwca 1958r., 60-545 Poznań, Poland.
authors.forename: Agata
authors.initials: A
authors.lastname: Bednarek
authors.affiliation: Department of Rheumatology and Rehabilitation, Poznan University of Medical Sciences, 28 Czerwca 1958r., 60-545 Poznań, Poland.
authors.forename: Włodzimierz
authors.initials: W
authors.lastname: Samborski
mesh_terms: D015669:Acupuncture Points; D005260:Female; D006801:Humans; D008297:Male; D012867:Skin; D012879:Skin Physiological Phenomena; D064171:Superficial Back Muscles / Q000502:physiology*; D061028:Trigger Points / Q000502:physiology*