title: The concurrent validity of a hand-held versus a stationary dynamometer in testing isometric shoulder strength.
abstract: METHODS
  Clinical Measurement-Validity.
  
  
  BACKGROUND
  Validity of the JTech PowerTrack II hand-held dynamometer (JTech; JTech Medical, Salt Lake City, UT) for measuring shoulder strength has yet to be established.
  
  
  OBJECTIVE
  To examine the concurrent validity of isometric strength scores obtained with the JTech PowerTrack II, and on a stationary dynamometer, the LIDO WorkSET (LIDO; LoredanBiomedical, West Sacramento, CA).
  
  
  METHODS
  Thirty-eight subjects performed three maximal efforts of shoulder flexion, abduction, and external rotation on a single occasion on the two dynamometers. Two testers were randomly assigned to administer the tests.
  
  
  RESULTS
  Pearson correlations between the scores on the two dynamometers (r.0.81) indicated a good concurrent validity. Correlations were similar when the results were subdivided by tester or gender.
  
  
  CONCLUSIONS
  This study suggests that either the JTech PowerTrack II or LIDOWorkSET provide comparable scores for shoulder strength. Although not interchangeable because of the differences in units of measurement, the relative conclusions about strength should be similar, regardless of which instrument is used.
  
  
  METHODS
  Not applicable.
authors: School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada. jean-sebastien.roy.1@ulaval.ca
authors: Jean-Sébastien
authors: JS
authors: Roy
authors: Joy C
authors: JC
authors: MacDermid
authors: Brock
authors: B
authors: Orton
authors: Thomas
authors: T
authors: Tran
authors: Kenneth J
authors: KJ
authors: Faber
authors: Darren
authors: D
authors: Drosdowech
authors: George S
authors: GS
authors: Athwal
mesh_terms: D000328:Adult; D004867:Equipment Design; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer; D011897:Random Allocation; D012399:Rotation; D012494:Sampling Studies; D012785:Shoulder Joint / Q000502:physiology*