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Isometric and swallowing tongue strength in healthy adults§

Authors


  • Presented at the Triological Society Combined Sections Meeting, San Diego, California, U.S.A., April 20–21, 2012.

  • This work was supported by National Institute on Deafness and Other Communication Disorders R03 DC009875, by the Wake Forest School of Medicine Claude D. Pepper Older Americans Independence Center (P30 AG21332), and by the General Clinical Research Center grant of Wake Forest Baptist Medical Center (M01-RR07122).

  • §

    The authors have no other funding, financial relationships, or conflicts of interest to disclose.

PhD, Department of Otolaryngology, 4th floor, Watlington Hall, Medical Center Blvd, Winston-Salem, NC 27157. E-mail: sbutler@wakehealth.edu

Abstract

Objectives/Hypothesis

The tongue contributes to a safe swallow. It facilitates bolus control during mastication, maintains a bolus in the oral cavity to prevent premature entry of the bolus into the hypopharynx, and helps generate pressure in the hypopharynx during swallowing. This study examined isometric tongue strength and tongue pressure measured during swallowing in healthy young and older adults.

Study Design

Prospective group design.

Methods

One hundred twenty-six healthy individuals who were recruited as part of a larger study on swallowing participated in this study. Participants were divided into three age groups: 20 to 40 years, 41 to 60 years, and ≥61 years. A KayPentax Digital Swallowing Workstation with an air-filled bulb array was placed on the tongue of each participant (anterior to posterior). Participants completed three isometric tongue presses and three swallows.

Results

Repeated measures analyses of variance revealed a significant main effect of age (P = .01) and gender by tongue bulb location interaction (P = .02) for isometric tongue strength. That is, older adults had lower isometric tongue strength than young adults, and females had a greater difference between anterior and posterior tongue strength than males. Tongue strength during swallowing yielded significantly greater anterior versus posterior tongue pressure.

Conclusions

This study comprises one of the largest in terms of number of healthy participants reported to date and confirms previous findings that isometric tongue strength decreases with age. Furthermore, given young and older adults generate similar swallowing pressures, swallowing is a submaximal strength activity, yet older adults have less functional reserve. Laryngoscope, 123:2469–2473, 2013

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