Abstract
Using a signal indicator, an integer calculation with two figures was loaded to male college students as a mental task. Effects of several factors on physiological and psychological parameters were investigated by experimental design method. The factors studied here were (A) task load (40 and 80% of maximum speed of each subject), (B) sleeping hours in the previous night (8 and 0 hr), (C) working hours (20 and 60 min) and (D) rest hours after task (60 and 20 min). The physiological parameters were pulse rate, axillary temperature, blood pressure, plasma volume and plasma protein. The psychological parameters were rating value of hardness of work and error answer ratio (%) in the calculation.During the task period, error answer ratio, rating value, pulse rate and axil-lary temperature were statistically significant for the factor of task load (A). The severe task load provoked more intense effect on those parameters than the weak load.Sleep deprivation in the previous night caused change of pulse rate and plasma protein in the rest time. Interactions between task load and sleeping hours (A×B) and working hours (A×C) were significant on the values only concerning the blood such as hemoglobin concentration and total protein.These results might be applied for evaluation of labour environmental condi-tions.
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