Must-have measurements for comfortable seating | WOOD Magazine
You may need to adjust the dimensions and angles slightly depending on the ... If the chair will have a cushion account for its compressed thickness in the seat ... and bottom of the lower backrest or curve out the lower 4–8" of the backrest.
Chair Design and Sitting - Cornell University Ergonomics Web
Biomechanics of Sitting - depending on chair and posture some proportion of ... Sacrum - Upper surface of sacrum is at an angle to the horizontal plane. ... Seat Angle - Positive seat angle helps user to maintain good contact with backrest.