摘要：Value of flickering frequency and reaction time by colour naming method (work limit system) were measured as an index to define the grade of fatigue before and after the test described in the previous paper, at Fujieda-Kita High School. 1) The grade of fatigue under silent condition was not shown by flickering test but 3% increase in the grade of fatigue was shown under noisy condition. Significant difference of the values of flickering frequency between before and after the test was shown with 5% level of significance. 2) The grade of fatigue by measuring reaction time was not shown under both silent and noisy condition. It was considered from the result of 1) that noise affected directly on the grade of fatigue because same subjects were tested.
