振動・騒音及び静的重量負荷に対する作業者の生理的応答 (心電図・筋電図) について

Abstract

チェーンソーの振動・騒音による神経的負荷及び鉄アレイ把持による静的重量負荷を与えた場合の作業者の生理的応答 (心電図, 表面筋電図) をFMテレメー夕方式にて計測した。そして, 各因子聞の回帰式及び自己-, 相互相関関数やスペクトルを計算し, 上述の負荷と生理的応答との関係を定量的に検討した。その結果, 心拍数, 筋電図積分値と静的重量負荷とはほぼ直線的関係があること, また, 心拍数は振動, 騒音の変動に良く応答するものであることが明らかになり, これ等を静的筋負担や神経的負担の指標として利用できることを示した。

With FM wireless telemeter heart rates and surface electromiograms (EMG) of the forearm of three young healty male subjects were measured and recorded with an analogue datarecorder when they held statically a dumbbell (2kgf~10kgf) with their right arms and were exposed to vibration and noise of a chain-saw. In order to study the relations between heart rate and integrated EMG value and static load, regression equations were calculated. And also in order to study the correlation among noise, vibration and heart rate, auto-, cross-correlation functions and power spectra were calculated with a digital computer. The results: 1. Approximately both heart rate and integrated EMG value linearly related to the static load (see Fig.-l~Fig.-5). 2. Heart rate fluctuation fairly corresponded to the fluctuations of noise and vibration of a chain saw during operation (see Fig.-6~Fig.-8). 3. Heart rate and EMG have been shown to be able to be applied in evaluating of the static work and the skilled work.