hypertonia

[hahy-per-toh-nee-uh]
noun Pathology.
increased rigidity, tension, and spasticity of the muscles.

Origin:
1835–45; hyper- + -tonia

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American Heritage
Medical Dictionary

hypertonia hy·per·to·ni·a (hī'pər-tō'nē-ə)
n.
Extreme tension of the muscles or arteries.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Finally, dyskinetic cerebral palsy is characterised by both hypo- and hypertonia often alternating in the same muscles.
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