Barlow S M, Rath E M
J Speech Hear Res. 1985 Sep;28(3):373-6. doi: 10.1044/jshr.2803.373.
Forces generated by facial muscles during speech production have previously been estimated to involve up to 20% of maximum voluntary closing force. The gross nature of this estimate is due, in part, to the complex relationship between muscle contraction and three-dimensional tissue conformation and to the lack of data concerning maximum force. The objective of the present study was to determine the maximum voluntary closing forces for the upper and lower lips in male and female adults. The results indicate the maximum force capabilities for the lower lip to be approximately three times greater than for the upper lip. Male subjects generated significantly greater lip closing forces than female subjects. The large difference between the upper and lower lips as force plants is discussed in relation to speech function and skilled motor behavior.
先前估计，在言语产生过程中面部肌肉产生的力量高达最大自主闭合力的20%。这一估计的粗略性部分归因于肌肉收缩与三维组织形态之间的复杂关系，以及缺乏关于最大力量的数据。本研究的目的是确定成年男性和女性上唇和下唇的最大自主闭合力。结果表明，下唇的最大力量能力约为上唇的三倍。男性受试者产生的唇部闭合力明显大于女性受试者。文中讨论了作为施力部位的上唇和下唇之间的巨大差异与言语功能和熟练运动行为的关系。
