〇Takeshi Ebara¹, Hisashi Eguchi², Satoru Kanamori³, Naomichi Tani¹, Mieko Ohsuga⁴ (1. Department of Ergonomics, the University of Occupational and Environmental Health, Japan, 2. the University of Occupational and Environmental Health, Japan, 3. Teikyo University, 4. Osaka Institute of Technology)