Hunker C J, Abbs J H, Barlow S M
Neurology. 1982 Jul;32(7):749-54. doi: 10.1212/wnl.32.7.749.
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.
通过施加已知力并观察由此产生的位移来确定唇部刚度系数，从而对帕金森病患者和正常受试者的唇部肌肉僵硬程度进行量化。同时，观察这些受试者的唇部言语动作，以评估运动迟缓。唇部僵硬程度始终与唇部运动范围的减小相关。口轮匝肌和颏肌的肌电图表明僵硬与运动迟缓之间存在因果关系。
