Influences of three factors (duration, density and difficulty) of a mental task onthe stress responses were studied in young male subjects. Arithmetical calculationtasks were assigned to the subjects by using a signal indicator.
"Addition-subtraction task" of 60 consecutive min was accompanied by significantchanges in diastolic pressure, and in the serum levels of water and proteins (bothalbumin and globulin). These variables underwent changes at 10 min from the begin-ning of the task and remained thereafter on the constant levels up to 60 min.
A comparative experiment on four density grades of "addition-subtraction task"showed that higher density tasks caused marked rises in the serum levels of freefatty acids and proteins (both albumin and globulin). It was thus elucidated thatthe density of the task is a factor involved in the stress induction by the task.
No appreciable changes were provoked in every variables by a simple task con-sisted of comparison of two figures, whereas marked changes were brought aboutin the serum levels of water and proteins (both albumin and globulin) by a task con-sisted of calculation of the difference in two figures at the same task density asthe former. Moreover, pulse rate, diastolic pressure, and the serum levels of free fattyacids, water and proteins were considerably changed by "addition-subtraction task".
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