Miyakita T, Miura H, Futatsuka M
Br J Ind Med. 1987 Jan;44(1):41-6. doi: 10.1136/oem.44.1.41.
This experimental study was designed to determine whether a combination of noise and vibration produced more pronounced changes in temporary shifts of finger skin temperature and temporary threshold shift (TTS) of hearing than those resulting from exposure to either stress alone. Nineteen healthy subjects were exposed to six different combinations of vibration, noise, and handle holding by using a chain saw for a pre-determined time. The mean value of normalised finger skin temperature decreased much more when the subjects operated a chain saw at high speed (exposure 1) than when they operated the chain saw with the noise isolated by double hearing protection (exposure 2). In five of the 14 subjects significantly larger TTS values at 4 kHz were observed in the former condition (exposure 1) compared with the values obtained when they stood beside someone else operating a chain saw (exposure 3). The results of this study suggest that noise may play a part in inducing the constriction of the peripheral vessels seen with local exposure to vibration, and that hand-arm vibration may produce an additive effect on the noise induced TTS.
本实验研究旨在确定与单独暴露于压力相比，噪声和振动的组合是否会使手指皮肤温度的暂时变化和听力的暂时阈移（TTS）产生更明显的变化。19名健康受试者使用链锯在预定时间内暴露于振动、噪声和握持手柄的六种不同组合中。与使用双重听力保护隔离噪声操作链锯时（暴露2）相比，受试者高速操作链锯时（暴露1），标准化手指皮肤温度的平均值下降得更多。在14名受试者中，有5名在前者条件下（暴露1）观察到4kHz时的TTS值明显大于他们站在其他人操作链锯旁边时获得的值（暴露3）。本研究结果表明，噪声可能在局部暴露于振动时诱导外周血管收缩中起作用，并且手臂振动可能对噪声诱导的TTS产生叠加效应。
