Temporary threshold shift of the vibration perception threshold following a short duration exposure to vibration

摘要

The objective of this study is to analyze the evolution of the vibration perception threshold(VPT) following a short duration exposure to vibration. The literature reports experiments with 3 to 10 min exposure to vibration after which a steady state is not necessarily reached. The temporary threshold shift(TTS)of the VPT is extrapolated from data recorded during the recovery period. The assumption of a linear decrease with the logarithm of time gives erroneous results for the TTS extrapolated at the end of the exposure. 81 experiments were conducted on 9 young subjects without any neurological problem, exposed to acceleration amplitudes of 5,20 and 80 ms~-2 at frequencies of 31.5(conditions 1 to 3), 125 (conditions 4 to 6)and 500 Hz(conditions 7 to 9).