振動負荷による手指尖振動感覚閾値の変化と負荷振動の物理的パラメーターとの関係 : 第1報 振動負荷および振動感覚閾値測定の方法について
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The purpose of these papers (Part 1, Part 2) is to clarify the temporary threshold shift (=TTS) of human vibratory sensation after localized vibration exposure and to take data for hygienic allowable limit of vibration of portable mechanized tool.Part 1 was a preparatory experiment on the methods of vibration exposure and vibratory sensation measurement. In this Part 1, five healthy subjects were exposed to six kinds of vibration, the frequencies of which were 31.5, 125 and 500Hz, respectively, and each acceleration which was 1g or 5g (Fig. 2).Each subject put his right hand on the vibrator plate in a relaxed sitting posture and was exposed with sinusoidal vibration (Fig. 1). Vibratory sensation thresholds (63Hz, 125Hz, 250Hz) at the fingertip were measured before and after the vibration exposure. The skin temperature on the back side of the same finger, which was considered to effect the vibratory sensation threshold, was also measured.The room temperature was kept at 20∼23°C during the experiment.In this paper, vibratory sensation threshold and exposed vibration were expressed with peak values of acceleration.The result was as follows:1. The accumulation effect of vibratory sensation threshold owing to repeated vibration exposure was eliminated by the 15min. rest and some exercises of four extrimities between the serious vibration exposure (Fig. 3).2. Variations of the skin temperature owing to vibration exposure were not so great. Therefore, it was considered that the effect of the skin temperature on the vibratory sensation threshold was negligible in the method used in this experiment (Table 1).3. After vibration exposure, increases of vibratory sensation thresholds were statisticaly significant on the exposed side. And, the values of TTS of vibratory sensation were affected by the frequency and acceleration level of exposed vibration. But, the increase of vibratory sensation threshold was not clearly observed on the unexposed side (Table 1).4. After vibration exposure, TTS of vibratory sensation decreased almost linealy with the logarithm of the time (Fig. 4). Therefore, it was considered that prompt measurement after vibration exposure is necessary to obtain an exact value of TTS. On this point, the measurement method of vibratory sensation threshold in this experiment was available.
- 日本衛生学会の論文
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関連論文
- 振動負荷による手指尖振動感覚閾値の変化と負荷振動の物理的パラメーターとの関係 : 第2報 振動感覚の等TTS曲線と許容基準について
- 振動負荷による手指尖振動感覚閾値の変化と負荷振動の物理的パラメーターとの関係 : 第1報 振動負荷および振動感覚閾値測定の方法について