Dependency of Temporary Threshold Shift of Vibratory Sensation in Fingertip on 1/3 Octave-Band Hand-Arm Vibration Exposure Period

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Objectives: To investigate the dependency of temporary threshold shift of vibratoty sensation (TTS_v) in fingertip on hand-arm vibration exposure period. Methods: Six healthy students were instructed to grip a vibrating or nonvibrating handle in the experimental room. The gripping force was 40N. The vibratory sensation threshold at 125Hz was measured before and after the exposure in the exposed middle fingertip. The exposure vibration was vertical and the 1/3 octave-band vibration with had a central frequency of 200Hz and an intensity of 39.2m/s^2. The exposure periods were 8, 15, 30, 60, 120, 240 and 600s. TTS_<v,t> was evaluated as the difference in vibratory sensation threshold between immediately before and t seconds after the exposure. Results: TTS_v recovered exponentially as in several previous studies and its use enabled us to estimate the time constant and TTS_<v,0>. TTS_<v,0> with vibration exposure was significantly larger than that without it. The regression analysis of the relationship between vibration exposure period (T) and TTS_<v,0> (T) for each subject confirmed the good fit of the equation TTS_<v,0> (T)=B_0+B_1 ^*Log_<10> (T), where B_0 and B_1 are the calculated constants (adjusted R^2=0.56-0.87). The time constants did not show such a clear dose effect relationship of exposure period as TTS_<v,0>. Conclusion: The dependency of TTS_<v,0> on vibration exposure period was asymptotically proportional to the logarithm of gripping period. To more quantitatively confirm the relationship of the time constants for recovering time course of TTS_v, it maybe necessary to improve the measurement method for TTS_v.
日本衛生学会の論文

Dependency of Temporary Threshold Shift of Vibratory Sensation in Fingertip on 1/3 Octave-Band Hand-Arm Vibration Exposure Period

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