Over a period of one week from October 7, 1953, the authors investigated the actual labor status of the workers in a machine factory situated in Tokyo. Simultaneously, we conducted various examinations on the fatigue sustained by 60 representative workers among those engaged in various kinds of jobs.
The results obtained were as follows:
(1) In most cases in the factory under the present survey, the intensity of the principal work allotted to various jobs was below 1.5 in terms of R. M. R., indicating that the work belongs to the category of light labor. However, the actual working time was remarkably long, and the actual working rate was around 100% both in the case of regular working time and on the cases of over-time work.
Consequently, the amount of labor was almost reaching the maximum amount of labor reported by Shirai even in the case of regular working time, and it usually exceeded the maximum in the case of over-time work.
(2) The flicker value, the number of circulating eosinophiles, the phagocytic actions of leucocy tes etc. showed the tendency of declining with the lapse of days, but they recovered the original values after one off-day (for example, after one Sunday) .
(3) In the case of over-time work, the efficiencies in various jobs were found generally showing a tendency of declining compared with those in the case of regular working time. Specifically, the flicker value was found remarkably declined, demonstrating a highly significant difference.
Consequently, the accumulated fatigue is readily presumed when such over-time work is forced to continue.
(4) In view of the results of the survey on the actual status of the works in the factory under survey and the results of various examinations for fatigue, the weariness claimed by the workers is considered to be due to the nervous fatigue caused by the continuous working over a long time.
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