Ten students who belong to the volleyball club in a women's university practiced vollyball for 2 hours; 35 female students were walked for 1 hour (Mean heart rate: 105 beats/min). 32 and 6 female students took the one digit addition of Kraepelin's test for 60 and 90 min, respectively. The number of complaints of subjective symptoms, flicker fusion value, the excretion rate of urinary 17-OHCS (17-hydroxycorticosteroids), protein and creatinine before and after physical or mental work were investigated. The questionnaire included thirty questions, divided into three groups each consisting of ten symptoms, I: drowsiness and dullness, II: difficulty in concentration, III: projection of physical disintegration. The results obtained were as follows: 1) The number of subjective symptoms in those who walked were particulary increased in groups I and III. Group II symptoms were increased in the participants who calculated the one digit addition. 2) The flicker fusion value after physical exercise was not decresed, but in one digit addition the flicker fusion value was significant decreased after working. 3) The excretion of urinary 17-OHCS tended to decrease after vollyball training and walking. In the case of one digit addition, the excretion of urinary 17-OHCS was increased. 4) The excretion of urinary protein was generally increased after vollyball training, and urinary creatinine was increased after physical and mental work.
In conclusion a difference was demonstrated between physical and mental work and related complaints of subjective symptoms, flicker fusion values and excretion rates of urinary 17-OHCS.