Abstract
We investigated how a transverse radius of cushion influences a sitting comfort of OA chair in the case of working for a long time. Sensory values of sitting comfort were measured by the SD method. Body pressures and contact areas between a human body and chairs were measured. The results of sensory evaluation were examined by the factor analysis and the relation between sensory values and physical properties was also examined. The results were as follows: (1) Sensory value “Comfort”had a positive correlation with “Fit”, “Hold”and “Easy to work”, and had a negative correlation with “Tired”.(2) The sitting comfort of OA chair was evaluated by two adjectives “Painful”and “Easy”after sitting for 15 minutes and by “Comfort”and “Pressure at buttoks and waist”after sitting for 30 minutes.(3) After sitting for 30 minutes, body pressures at the ischiadic tubercle part and the sacrum part were increasing.(4) “Comfort”and “Easy”were judged by the contact areas at the lumber vertebra part and “Pressure at buttoks”was judged by the contact areas at the high pressures parts.
