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Journal of Speech, Language, and Hearing Research Vol.40 400-404 April 1997.
© American Speech-Language-Hearing Association
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Maximum Interlabial Pressures in Normal Speakers

Virginia A. Hinton 1
Winston M. C. Arokiasamy 2
1 Division of Communication Sciences and Disorders University of North Carolina-Greensboro
2 Speech Language Pathology Services of Robeson County

It has been hypothesized that typical speech movements do not involve large muscular forces and that normal speakers use less than 20% of the maximum orofacial muscle contractile forces that are available (e.g., Amerman, 1993; Barlow & Abbs, 1984; Barlow & Netsell, 1986; DePaul & Brooks, 1993). However, no direct evidence for this hypothesis has been provided. This study investigated the percentage of maximum interlabial contact pressures (force per unit area) typically used during speech production. The primary conclusion of this study is that normal speakers typically use less than 20% of the available interlabial contact pressure, whether or not the jaw contributes to bilabial closure. Production of the phone [p] at conversational rate and intensity generated an average of 10.56% of maximum available interlabial pressure (MILP) when jaw movement was not restricted and 14.62% when jaw movement was eliminated.

KEY WORDS: interlabial contact pressure, bilabial closure, speech production

Submitted on July 8, 1996
Accepted on November 14, 1996


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