EPIDEMIOLOGICAL STUDY ON THE HEALTH DISORDER OF THE WORKERS USING MECHANIZED HAND-TOOLS FOR ASSEMBLING SMALL PARTS.

目的是阐明操作机械化手工工具（MT）的工人的健康状况之间的关系。MT包括电动驱动器和空气驱动器，以及电动部件制造商的工作条件。对59名女工进行了振动危害专项检查，其中MT作业人员39名（A组），对照组20名（B组），均在同一车间内无MT作业。提交人询问了他们的健康和工作条件以及体检情况。周围神经系统的测量项目为手和手臂的振动感觉和感觉神经传导速度（SNCV）;肌肉骨骼功能的测量项目为捏力、抓力、背力和敲击能力。A组患者主诉“手刺痛”、“手麻木”、“伸指困难”的发生率明显高于B组，“手肿胀”、“手臂沉重感”的发生率有高于B组的趋势。捏力和抓力A组的手部SNCV中位数显著低于B组。A组的最大振动加速度水平显著低于B组。结果表明，虽然振动水平很低，但由于振动强度的增加，MT作业工人出现生理变化。

The aim was to clarify the relations between the health status of the workers operating mechanized hand tools (MT). MT included electric drivers and air drivers, and the working conditions in an electric parts' maker. Fifty-nine female warkers underwent the special examination for vibration hazards, made up of 39 MT operators (Group A) and 20 controls (Group B) who worked without MT at the same plant. The authors made questions about their health and working conditions and physical examinations. The measured items of the peripheral nervous system were the vibratory sensation and sensory nerve conduction velocity (SNCV) in the hand and arm. Those of the musculoskeletal function were pinching power, grasping power, back strength, and tapping ability. The frequency of the complaints "Tingling of hands" and "Numbness of hands" and "Difficulty of finger extension" in Group A wsa significanty higher than in Group B.The frequency of "Swelling of hands" and "Heavy feeling of arms" in Group A had a higher tendency than Group B.There was no difference in the results of physical examinations and vibratory sensation. Pinching power and grasping power (both hands) and back strength in group A was greater than in Group B.Median SNCV in the hand in Group A was significantly slower than in Group B.The maximum vibration acceleration level (0.56-1.8m/s2) of the MT used at the plant did not exceed the exposure guideline of ISO.The results suggest that although the vibration level was low enough, physiological changes appeared in the workers with MT.