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n. Physiology
The state of being hypertonic.


(Medicine) med an unusual increase in muscle tension making stretching difficult or impossible


(ˌhaɪ pərˈtoʊ ni ə)

increased rigidity, tension, and spasticity of the muscles.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hypertonia - (of muscular tissue) the state of being hypertonic
tonicity, tonus, tone - the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; "the doctor tested my tonicity"
hypotonia, hypotonus, hypotonicity - (of muscular tissue) the state of being hypotonic
References in periodicals archive ?
The primary outcome of the study was change in muscle tone and spastic hypertonia as measured by the change in average Ashworth scale (AS) score in the lower extremity (LE) of the affected body side from baseline to month six.
Neurological examination revealed bilateral horizontal nystagmus and hypertonia in both legs with nearly normal muscle strength in the four limbs.
A very common and acceptable theory says that raised resting anal sphincter pressure or anal muscle spasm causes comparative ischemia of mucosa of anal canal particularly in posterior midline tears, which results in persistence of internal sphincter hypertonia followed by hard stool due to constipation.
Other reported neurologic sequelae include congenital limb contractures, dysphagia, sensorineural hearing loss, epilepsy, and abnormalities of tone or movement, including marked hypertonia and signs of extrapyramidal involvement (14,15).
Spastic movement disorders such as cerebral palsy frequently lead to bruxism with masseter muscle hypertonia.
Comprehensive multispecialty medical and developmental follow-up documented that 10 of 13 infants had dysphagia, 7 had epilepsy, 3 had chorioretinal abnormalities, all 13 had hypertonia, and 12 had pyramidal and extrapyramidal signs with dystonia (MMWR.
All infants had a degree of neurologic damage, with global developmental delays, hypertonia of the limbs, and pyramidal and extrapyramidal signs; most infants had abnormal movement of the tongue, contributing to dysphagia.
CNS examination revealed generalized hypertonia, hyperreflexia, and spasticity and upgoing plantars.
In healthy controls, we found five patients with gynecological diseases (endometriosis, myoma uteri, and PCOS), two patients with hypothyreosis, one with hypertonia, and one with pancreas divisum.
6,13 Stretch reflex is responsible for regulation of muscle stiffness and exaggerated response as this is responsible for hypertonia.
Reinhold's system, beginning in 1952, was the first medical approach to acupuncture of substance, an electrodermal method to measure "energy" at the topical acupuncture points as anatomical references and to evaluate ailments from a state of hypertonia or hypotonia measured electronically.
On the 5th day, baby developed a seizure, which was characterised by a staring gaze and motor manifestations such as diffuse extension with hypertonia of the upper limbs.