Malchaire J, Rodriguez Diaz L S, Piette A, Gonçalves Amaral F, de Schaetzen D
Unité Hygiène et Physiologie du Travail, Université catholique de Louvain, Clos Chapelle-aux-Champs, Brussel, Belgium.
Int Arch Occup Environ Health. 1998 Jun;71(4):270-6. doi: 10.1007/s004200050280.
The aim of the present study was to quantify the sensory and functional effects resulting from a short-duration (30 min) exposure to hand-arm vibration.
Nine subjects went through nine laboratory experiments. For 32 min they grasped a handle vibrating at three different amplitudes (5, 20, and 80 ms-2) and at three frequencies (31.5, 125, and 500 Hz). Additionally, a reference experiment was conducted in which the handle did not vibrate. Three sensory tests [vibration perception threshold (VPT), pressure perception threshold (PPT), and distal sensory latency time (DSL)], two functional tests [Purdue peg-board (PPB) and maximal voluntary force (MVF)], and a questionnaire concerning the perceived paresthesia and numbness were completed before, during, and after exposure.
A 32-min period of exposure to vibration leads to a temporary threshold shift (TTS) of the VPT and to the development of paresthesia and numbness. The VPT appears to vary with the exposure duration according to a first-order model with a time constant about equal to 3 min. The TTS increases with the vibration acceleration amplitude and is greater for an exposure frequency of 125 Hz than for that of 31.5 or 500 Hz. It is also greater at the test frequency 125 Hz than at 31.5 Hz. The other tests do not demonstrate any significant variation. In particular, the PPB test does not demonstrate any loss of dexterity.
After some 30 min of exposure to vibration the VPTs are increased and paresthesia and numbness develop. However, these do not appear to influence significantly the capacity or performance at work.
本研究旨在量化短时间（30分钟）接触手臂振动所产生的感觉和功能影响。
九名受试者参与了九项实验室实验。在32分钟内，他们握住一个手柄，该手柄以三种不同的振幅（5、20和80毫秒-2）和三种频率（31.5、125和500赫兹）振动。此外，还进行了一项对照实验，即手柄不振动。在接触振动前、接触过程中和接触后，完成了三项感觉测试[振动感觉阈值（VPT）、压力感觉阈值（PPT）和远端感觉潜伏期（DSL）]、两项功能测试[普渡钉板测试（PPB）和最大随意力（MVF）]，以及一份关于感觉异常和麻木感的问卷。
32分钟的振动暴露会导致VPT出现暂时阈值偏移（TTS），并产生感觉异常和麻木感。VPT似乎根据一个时间常数约为3分钟的一阶模型随暴露持续时间而变化。TTS随振动加速度振幅增加，且在125赫兹的暴露频率下比在31.5或500赫兹时更大。在测试频率125赫兹时也比31.5赫兹时更大。其他测试未显示出任何显著变化。特别是，PPB测试未显示出灵活性的任何丧失。
接触振动约30分钟后，VPT会升高，感觉异常和麻木感会出现。然而，这些似乎并未对工作能力或表现产生显著影响。
