Abstract
Eight healthy subjects were exposed to three 1/3 octave-band vibrations (63, 200, and 500 Hz) by hand clasping a vibrated handle in a soundproof and thermoregulated room. The vibratory sensation threshold at 125 Hz was measured before and after the vibration exposure at an exposed fingertip. According to a preceding study, we first determined the relationship between the acceleration of the vibration and the temporary threshold shift of vibratory sensation immediately after the vibratory exposure (TTSv, 0) induced by 1/3 octave-band vibration. We then measured TTSv after the exposure to a composite vibration composed of two 1/3 octave-band vibrations that might induce an equal magnitude of TTSv, 0 on the basis of the above relationship. The TTSv, 0 induced by the composite vibration was not larger than the TTSv, 0 induced by the component vibrations. This result suggests that the component of the vibration inducing the largest TTSv, 0 determines the TTSv, 0 by broad-band random vibration.
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Nishiyama, K., Taoda, K., Yamashita, H. et al. The temporary threshold shift of vibratory sensation induced by composite-band vibration exposure. Int. Arch Occup Environ Heath 68, 255–261 (1996). https://doi.org/10.1007/BF00381437
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DOI: https://doi.org/10.1007/BF00381437