Effects of Aging on Otoacoustic Emissions.

DOI 2 Citations 24 References
  • Mishima Takekazu
    Department of Otorhinolaryngology, Juntendo University School of Medicine
  • Yoshikawa Hiroshi
    Department of Otorhinolaryngology, Juntendo University School of Medicine
  • Nishijima Takashi
    Department of Otorhinolaryngology, Juntendo University School of Medicine
  • Ota Tomoyuki
    Department of Otorhinolaryngology, Juntendo University School of Medicine
  • Ando Ichiro
    Department of Otorhinolaryngology, Juntendo University School of Medicine

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  • 耳音響放射における年齢の影響

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Abstract

We investigated the effects of aging on otoacoustic emission (OAE) using ILO88 and ILO92. Much works on OAE related to aging have been done, however most studies were carried out on subjects with impaired hearing mainly in the high-frequency range. In the present study, therefore, the effect of aging on OAE was investigated in normal subjects with hearing level within 20dB in the entire frequencies. Spontaneous otoacoustic emission (SOAE) measurements were obtained in 220 ears of women. Evoked otoacoustic emission (EOAE) and Distortion product otoacoustic emission (DPOAE) measurements were obtained in 80 SOAE free ears of both sexes. As for EOAE the frequency of 4-kHz filtered echo power and the total echo power were decreased with increasing age. In addition, the DP level at each frequency was decreased particulary in the high-frequency range. These findings suggest that EOAE and DPOAE reflect age-related changes in the acoustic system which were not detected by the pure tone hearing test. The significant difference in DP level in the mid-frequency range is presum-ably age-related change in the dynamic characteristics of the middle ear.

Journal

  • AUDIOLOGY JAPAN

    AUDIOLOGY JAPAN 41 (6), 707-716, 1998

    Japan Audiological Society

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