#myotonia  abnormally long muscular contractions; slow relaxation of a muscle after a contraction
  supertype:  #tonicity__tonus__tonu__tone  the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; "the doctor tested my tonicity"
  subtype:  #acromyotonia  myotonia of the extremities only; causes spastic deformity of the hand or foot
  subtype:  #myotonia_congenita__Thomsen's_disease  a mild, rare, congenital form of myotonia characterized by muscle stiffness

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