One of the mysteries of the English language finally explained.
Inability to relax voluntary muscle after vigorous effort.
- ‘Myotonic dystrophy, the most common form of muscular dystrophy in adults, affects the eyes, heart, hormonal systems, and blood, in addition to causing muscular dystrophy and involuntary muscle stiffness (myotonia).’
- ‘In several small studies, selenium supplementation seemed to have an effect on myotonia.’
- ‘Hereditary defects in the channels are known to cause many diseases, including dominant and recessive myotonia, Bartter's syndrome, and Dent's disease.’
Late 19th century: from myo- ‘muscle’ + Greek tonos ‘tone’.
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