• 한국안전학회지
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• 제20권2호
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• pp.169-174
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• 2005

최근 산업현장 전반에 걸쳐 작업관련성 근골격계질환의 발생이 증가하고 있으며 그 피해의 규모도 점점 확대되어 가고 있다. 뿐만 아니라, 과거에는 주로 중량물 취급 또는 단순반복적인 작업등에 의해서 발생하였지만 최근에는 대부분의 생산현장에서 컴퓨터를 이용한 자동화가 이루어지고 가정용 PC가 널리 보급됨에 따라 컴퓨터의 사용과 관련한 근골격계질환의 발생이 증가하고 있다. 많은 사람들이 컴퓨터의 사용과 관련한 불편함 및 통증을 호소하면서 각종 보조도구들이 개발 및 판매되고 있으나 대부분 그 효과가 입증되지 않은 상태로 사용되고 있어서 오히려 이러한 보조도구의 사용이 근골격계질환의 발생위험성을 더 높아지게 할 수도 있다. 본 연구에서는 마우스 사용 시 보조도구로 이용되는 전완 지지대의 사용에 대하여 그 효과를 실험을 통하여 평가하였다. 본 실험에서는 Borg's scale과 근전도(Electromyography : EMC)를 이용하여 측정하였으며 분산분석(Analysis of Variance : ANOVA)을 통해 유의성을 검증하였다. 측정자료를 분석한 결과 전완지지대'의 사용이 오히려 작업의 효율을 떨어뜨리고 작업자가 느끼는 불편함 및 통증의 정도와 근육의 활동량을 증가시킴을 알 수 있었다.

• Restorative Dentistry and Endodontics
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• 제17권1호
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• pp.22-35
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• 1992

The aim of this study was to investigate the effect of herbal organic extracts on the pain response provoked by noxious stimuli on dental nerve and the peripheral nerve conduction. Cats (2-2.5Kg regardless of sex) that were chosen as experimental animals were classified into control group, Asiasari radix application group and Zingiberis rhizoma application group. They were anesthetized with ${\alpha}$-chloralose, then anterior belly of digastric muscle of both sides were exposed and wire electrodes were inserted for recording of Electromyogram (EMG). Cavities were prepared on canines until pulp of the teeth were exposed. And after the drugs solubilized for 2% and 4% concentration (W/V) in vehicle were applied, their effects were compared through the recording of EMG immediately after drug application, 30 minutes, 60 minutes, 120 minutes and 5 days after, respectively. And after both inferior alveolar nerves were exposed, 4% organic extracts of Zingiberis rhizoma and Asiasari radix were applied for 30 minutes then the change of jaw opening reflex provoked by noxious stimuli on pulpal nerves were observed immediately after washing out, at 30, 60 and 90 minutes after drug had been washed out. After saphenous nerve of both sides were exposed, one side of nerve was used for vehicle application and the other side was used for drug application for 30 minutes. Then conduction of action potential of A-${\delta}$ and C-fiders of saphenous nerves, which have changed with time, was recorded. With analysis of these records, the following results were obtained: 1. Organic extract of Zingiberis rhizoma (2% or 4% concentration) greatly suppressed EMG of digastric muscle provoked by noxious stimuli on pulpal nerve at five days after application, the suppressive: effect was greater than that of organic extract of Asiasari radix. 2. Organic extract of Asiasari radix (2% or 4% concentration) suppressed jaw opening reflex provoked by noxious stimuli on pulpal nerve, at 5 days after drug application. 3. Organic extract of Zingiberis rhizoma and Asiasari radix (immediately after 30 minutes application) suppressed neural conduction of A-${\delta}$ and C-fibers, the suppressive effect was greater on A-${\delta}$ fibers than on C-fibers. 4. Jaw opening reflex provoked by noxious stimuli on pulpal nerve in inferior alveolar nerve was greatly suppressed 30 minutes after drug application, this effect was greater by Zingiberis rhizoma than by Asiasari radix.