ABSTRACT
The incidence of low back pain increases with seating duration. Health programmes have also improved: hip joints can be replaced; cataract operations allow people to see again and we can even get new hearts. The larger ones correspond to a herniated disc, and represent a definite cause of pain if nerve roots are compressed. However, muscle pain may appear later because joint-pain may induce muscle spasms in the surrounding area. The time pains occur he again feels that treatment is necessary. Ligaments and joint capsules are formed of elastic collagen fibres. When these fibres are stretched, they elongate; this elongation continues to increase during subsequent hours. The design of the lumbar support also affects seating ergonomics. In office seating, lumbar supports do not always increase lordosis. A sit-stand work place represents one such significant posture-changing feature for office and industrial seating.
