Fatigue Complaints and Critical Fusion Frequency of Flicker in an Aged Group

The value of critical fusion frequency of flicker (CFF) was measured and the questioning by Fatigue Scale of Industrial Fatigue Research Committee of Japan Association of Industrial Health was done on the aged men and women above sixty years old. The results obtained were as follows : 1) The total scores in the aged men and women were 14.6―22.0%, being higher than those of younger groups. 2) The relative ratio of I to the total scores (I/T) were 0.89―1.13, being lower than those of younger groups. 3) The three components were arranged II＞I＞III, according to frequency of complaints. This pattern was not found at any types of work in youger men and women. 4) The items which frequently complained were ”Become apt to forget things”, ”Apt to make mistake”, ”Feel stiff in the shoulders” and ”Suffer low back pain”. These items, however, seems to reflect rather aging than fatigue. 5) The value of CFF decreased according as the age goes up. 6) A significant correlation was found between the score of I and the value of C FF.