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Warm-Up Phenomenon

June 30th, 2019


  • How to Assess

  • Grip myotonia - ask the patient to repeatedly grip and release your fingers, watching for initial muscle stiffness followed by relaxation with repeated performance
  • Repeated eye closure - ask the patient to repeatedly close and open their eyes, looking for initial lag followed by improvement with repetition.
  • Significance

  • Initial stiffness and lag that improves with repetition is a sign of myotonia.
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