Hearing Loss Due to Kendo.

DOI 7 Citations 15 References
  • Yamakawa Takuya
    Department of Otorhinolaryngology, Juntendo Urayasu University, School of Medicine
  • Yoshikawa Hiroshi
    Department of Otorhinolaryngology, Juntendo Urayasu University, School of Medicine
  • Ando Ichiro
    Department of Otorhinolaryngology, Juntendo Urayasu Hospital
  • Ichiwaka Ginichiro
    Department of Otorhinolaryngology, Juntendo Urayasu University, School of Medicine

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  • 剣道による難聴について

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Description

Kendo is a traditional Japanese Sport and it is controversy whether Kendo causes hearing loss or not. The purpose of this report is to study the effects of a hitting sound and shock by “Shinai”, a bamboo sword, during Kendo exercise.<br>The hitting sound level were measured under the next three conditions; Menhimo, a belt for fitting “Men-Mask” is fastened hard, fastened ordinally, and using an air cushion inside a Men-Mask. As a result, the hitting sound level was over 120dB when the Men-Mask was fastened hard.<br>Shock was estimated by measuring the vibration acceleration level under the next five conditions, the Menhimo is fastened hard, fastened ordinally, using an air cushion inside the Men-Mask, feather or a styrol shock absorber. The vibration acceleration level was 77.7dB when the Menhimo was fastened hard.<br>However, if the air cushion was used inside the Men-Mask, the hitting sound level was decreased by 10dB, and the vibration acceleration level was about 1/70. We speculated that the hitting sound level and shock by Shinai had an excessive effect on inner ear, therefore Kendo exercise for a long time might cause a hearing loss.

Journal

  • AUDIOLOGY JAPAN

    AUDIOLOGY JAPAN 38 (4), 284-290, 1995

    Japan Audiological Society

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