〇Takeshi Ebara¹, Akihiko Seo², Kazuyuki Iwakiri³, Naomichi Tani¹, Teruyo Kitahara⁴, Atsushi Sugama³ (1. Department of Ergonomics, the University of Occupational and Environmental Health, Japan, 2. Tokyo Metropolitan University, 3. National Institute of Occupational Safety and Health, Japan, 4. Shiga University of Medical Science)