岸壁クレーン操縦者の疲労に関する研究
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概要
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Eight healthy male operators of wharf cranes were chosen for fatigue condition investigation. The investigations were done once in summer and once in winter of which a report is presented herewith. The period of the investigation in winter was consecutive five days from February 9 and that in Summer was five days as well from July 19 on. Their working time was extended from 8 a.m. to 4 p.m. with one hour's rest period coming after every hour of actual labor. 1. The environmental conditions of the operating seat were examined at 10 a.m. and 2 p.m. every day and were found to be almost equal to outdoor conditions, The temperature in winter was 7.2℃ at 10 a.m. and 10.2℃ at 2 p.m., and in summer it was 24℃ at 10 a.m. and 28℃ at 2 p.m. The humidity was 48.5% at 10 a.m. and 45.7% at 2 p.m., in winter, and in summer 58.2% at 10 a.m. and 60.4% at 2 p.m.. 2. The investigation of their living schedules revealed that they actually worked daily 200 minutes in summer and 250 minutes in winter and that they slept daily 521 minutes in winter and 424 minutes in summer, that is, they were sleeping longer time in winter than in summer while working about equal length of time in both seasons. Besides, hours of excercise, recreational activities and miscellaneous work were longer in summer than in winter Their caloric consumptions, were about that of the medium labor. Their nutritional intakes were just about covering their needs but for calcium, vitamins A and C, which were all a little short. 3. Their blinker values and grip strength values were lower in summer than in winter, indicating that those physiological functions were decreased in summer. 4. In summer, blinker and flicker values as well as grip strength values tended to lower during the lapse of days, suggesting that their fatigue was accumulative. 5. All the three values occasionally became a littel higher immediately after the beginning of work in the moring, but lapse of working hours they Iowered gradually, and at the time the work was over they were so low indicating an onset of established fatigue. The fact that the decrease of flicker values more than that of grip strength or blinker values suggested that the mental fatigue was more marked than the muscular fatigue. This decrease of flicker values were more in summer than in winter, suggesting that fatigue was more masked in summer than in winter. 6. In the thourly alternate repetition of work and rest, it was observed that blinker and flicker values lowered by work and recovered to some extent by rest, but in the afternoon, the decline of these values increased while the recovery became less and less, flicker values recoveringnil by rest in some occasions. The same tendency was observed in grip strength values though not as distinct as in the cases of the other two.
- 社団法人日本産業衛生学会の論文
- 1963-01-20