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The relationship between parkinsonian rigidity and hypokinesia in the orofacial system

A quantitative analysis

Speech Motor Control Laboratories, University of Wisconsin-Madison, Madison, WI.

Muscle rigidity was quantified in the labial muscles of parkinsonian and normal subjects by applying known forces and observing the resultant displacements to determine labial stiffness coefficients. In parallel, labial speech movements were observed from these same subjects to evaluate hypokinesia. Labial rigidity was consistently correlated with decrements in the range of lip movement. EMG from orbicularis oris and mentalis muscles indicated a causal relationship between rigidity and hypokinesia.

Address correspondence and reprint requests to Dr. Hunker, Speech Motor Control Laboratories, Waisman Center, 1500 Highland Avenue, Madison, WI 53706.

This work was sponsored by the National Institutes of Health Grant No NS3274-05.

Accepted for publication November 5, 1981.

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