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首页> 外文会议>6th Pan-Pacific Conference on Occupational Ergonomics null null >Digital Vibration Threshold, Fine Motor Impairment, and Hand Strength in Automobile Manufacturing Workers
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Digital Vibration Threshold, Fine Motor Impairment, and Hand Strength in Automobile Manufacturing Workers

机译：汽车制造工人的数字振动阈值，精细电机损伤和手部力量

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Vibration threshold (VT), a measure of hand sensory nerve function,is associated with segmental vibration exposure and other ergonomic stressors,as well as decreased hand strength. In a study of male automobile manufacturing workers, analyses were conducted to determine: 1. whether those with elevated VTs or fine motor functional impairment (FI) had lower grip or pinch strength, and 2. whether the combination of elevated VT plus FI improved the predictive value of either alone for hand strength. Subjects were surveyed at three time periods: baseline (TO) ( n = 988),one year (Tl) ( n = 664) and six-year (T2) ( n = 409) follow-up. Bilateral second and fifth digit VT norms at 120 Hz were established from the subjects ( n = 95) with self-reported low exposure to ergonomic stressors. Abnormal VTs were defined as greater than two standard deviations from the age-adjusted norms at T0. FI was defined as difficulty in buttoning clothing and/or picking up small objects at T0. Hand strength means were compared ( t -test) between VT normal and abnormal subjects,and also for those with and without FI. At T0,subjects with elevated fifth digit VTs compared with normal subjects had small but statistically significant bilateral decrements in pinch strength and reduced right grip strength. Right second digit VTs were similarly associated with reduced grip and pinch strength. However, these associations were not seen prospectively. Among workers with abnormal FI at baseline, the associations were stronger and more consistent. Yet those with both FI and elevated VT demonstrated even greater mean hand strength differences. Both at T0 and Tl ,grip and pinch strength were 20%～30% lower in these subjects (with elevated VT in either digit, all P < 0. 05 ). At T2 only, grip strength was reduced in those with fifth digit nerve impairment (R: 23.2 vs .21.2 kg,P = 0.06; L: 23.4 vs .20.8 kg,P< 0.05),and not similarly reduced in those with T0 FI only. VT,in combination with upper extremity FI,may be predictive of decreased hand strength. Further analyses will examine the pattern of upper extremity signs and symptom in these workers.
机译：振动阈值（VT）是手部感觉神经功能的量度，与节段性振动暴露和其他人体工程学压力源有关，以及手部力量下降。在一项针对男性汽车制造工人的研究中，进行了分析以确定：1. VT升高或轻微运动功能障碍（FI）的抓地力或捏力是否较低； 2. VT和FI升高的组合是否改善了两者对手部力量的预测价值。在三个时间段对受试者进行了调查：基线（TO）（n = 988），一年（T1）（n = 664）和六年（T2）（n = 409）随访。自报低暴露于人体工程学应激源的受试者（n = 95）建立了120 Hz的双侧第二和第五位VT规范。 VT异常定义为与在T0时的年龄校正后的标准相比有两个以上的标准偏差。 FI被定义为在T0扣上衣服和/或捡起小物件的难度。比较了VT正常和异常受试者以及有或没有FI的受试者的手强度平均值（t-检验）。在T0时，与正常受试者相比，五位数VT升高的受试者的双侧收缩力降低但统计学上显着，而右握力降低，这在统计学上具有显着意义。右第二个手指的VT同样与抓地力和捏力的降低相关。但是，这些关联没有被预期地看到。在基线时FI异常的工人中，关联性更强且更一致。然而，既有FI又有VT升高的人表现出更大的平均手力差异。在这些受试者中，在T0和T1时，握力和捏力都降低了20％〜30％（VT的任一数字均升高，所有P <0。05）。仅在T2时，五指神经损伤的患者的握力降低（R：23.2 vs .21.2 kg，P = 0.06； L：23.4 vs .20.8 kg，P <0.05），而在T0 FI的患者中握力没有降低只要。 VT结合上肢FI可以预示手部力量下降。进一步的分析将检查这些工人的上肢体征和症状。

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