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Clasp-knife spasticity

From Biology-Online Dictionary | Biology-Online Dictionary
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Clasp-knife spasticity

initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex.

See: lengthening reaction.

Synonym: clasp-knife effect, clasp-knife rigidity.