The work was supported by Cheng Hsin General Hospital (9631) of Taiwan.
Low body mass index and jaw movement are protective of hearing in users of personal listening devices
Article first published online: 1 APR 2013
© 2012 The American Laryngological, Rhinological and Otological Society, Inc.
Volume 123, Issue 8, pages 1983–1987, August 2013
How to Cite
Li, L. P.-H., Chuang, A. Y. C., McMahon, C., Tung, T.-H. and Chen, J. K.-C. (2013), Low body mass index and jaw movement are protective of hearing in users of personal listening devices. The Laryngoscope, 123: 1983–1987. doi: 10.1002/lary.23955
The authors have no other funding, financial relationships, or conflicts of interest to disclose.
- Issue published online: 19 JUL 2013
- Article first published online: 1 APR 2013
- Manuscript Accepted: 29 NOV 2012
- Manuscript Revised: 9 NOV 2012
- Manuscript Received: 3 MAY 2012
- Cheng Hsin General Hospital (9631) of Taiwan
- Personal listening devices;
- body mass index;
- hearing loss
Sound pressure level delivered through personal listening devices (PLDs) and reaching the ear drum might be affected by body size and jaw movements. This study aimed to investigate whether jaw movement and/or smaller body mass index (BMI) resulted in decrease of sound pressure level within the ear canals of PLD users via an earbud earphone.
Forty-five normal-hearing subjects (16 males; mean age, 23.3 years) participated in this study. A probe-microphone system was used to measure sound pressure level in the external ear canal with music delivered from a media player via an earbud earphone. Test materials consisted of two 20-second excerpts from a heavy metal music piece. Subjects were instructed to adjust the volume of the media player to conform to three conditions for sound pressure measurement: comfortable, loud, and maximum. Measurements were then repeated while subjects mimicked chewing action under the same listening conditions.
Sound pressure levels were significantly lower when measured with jaw movement than without jaw movement (P < .05). Sound pressure levels monitored with/without jaw movement were generally lower in subjects with a BMI<23 than those with a BMI ≥23 (P < .05).
Jaw movement and low BMI (<23) reduced the overall sound level of PLDs at the ear canal. Sound pressure levels detected in the external ear canal of our subjects using earbud earphones were significantly lower under conditions of jaw movement/BMI <23. Our research invites further studies on a larger group of PLD users to correlate these variables with hearing threshold shifts over time.
Level of Evidence
4. Laryngoscope, 123:1983–1987, 2013