Abstract
Aiming at the search of the method for the appraisal of the labour strains in the actual industrial labour, 124 representative workers of a factory were measured for the intensity of their principal work and the values of the work-amount during their working hours. Simultaneously, the patterns of the changes in the flicker values as well as the numbers of the circulating eosinophils during the working hours of the same workers were observed by time lapse. The outline of the results thus obtained are as follows:
(1) The tendency connecting the upper limits of the values of the work-amount and the fluctuating amount of the flicker values during the working hours against the intensity of work of each principal work indicated patterns which are contradicting each other.
(2) The rate of fluctuation in the number of circulating eosinophils did not demonstrate any fixed correlation with the value of work-amount during the working hours. However, its uppermost value demonstrated a tendency of reduction when the mean temperature exposed during the working hours. rose similarly to the case of the value of work-amount during the working hours.
(3) In the actual works in such a factory as that under the present investigation, the value of the work-amount during the working hours, the fluctuation in the flicker value and the number of the circulating eosinophils demonstrate tendencies to represent the muscular labour strain, mental labour strain and environmental labour strain respectively. Therefore, if indices of the labour strains of the workers engaged in various kinds of works are sought by combining these 3 indicators with a same weight, the approximate labour strain might be able to be estimated with these indices.
