Abstract: “In recent years, desk workers sitting in a chair for many hours have some problems: swelling of lower limbs, congestion, pressure ulcer and etc. This study aims to clarify the optimal seat angles. For this aim, the changes in lower limb blood flow causing these symptoms were measured to each combination of the seat angles. As a result, it was confirmed that the shear and compressive forces between the buttock and the seat fluctuated by the seat angle strongly influence lower limb blood flow. And the possibility to optimize the seat angles using these forces was indicated”

Keywords: ergonomic design, lower limb blood flow, seat, shear force