How does a backrest work?

  title={How does a backrest work?},
  author={E. N. Corlett and Julie Eklund},
  journal={Applied ergonomics},
  volume={15 2},
After discussing the distribution of forces in the stable upright posture and illustrating the importance of the lumbar lordosis for minimising muscular effort in this position, the loadings on the spine and muscles of the back are outlined during upright sitting. It is shown that the backrest locates the lumbar spine so that the CG of the superincumbent body parts can be positioned above the vertebrae, permitting the gravity load to be transmitted to the seat without the counteracting torques… CONTINUE READING