Posted by Nuwave at January 25th, 2011
There is a huge variety of chair designs used in offices today, most of which do not demonstrate a sufficient knowledge of the anatomy of a seated person. In the past, experts took the spinal column of the standing person and simply added the legs of a seated person. Today this flexed position is frowned upon and said to be avoided. Ergonomists criticised the traditional use of the “90° concept” in seat design because slumped, flexed postures are inevitable. The result of this posture is that more and more people struggle
with some sort of back ailment. The seated posture is one of the main causes of muscular skeletal stress associated with prolonged office work specifically when working at a desk with a computer screen.
The reason that the “90 degree posture” and the “forward leaning posture” are detrimental to you is that they do not allow the required amount of blood to reach the various parts of the body because they constrict the flow of blood; as well as, these positions put pressure on the various nerves running through channels at these joints and result in numbness and pain. Another reason is that the cushions between the vertebra carry the full weight of your body and legs as opposed to the standing position where they only carry the weight of your upper body. This is the main cause of back pain associated with sitting behind a desk on a chair that does not have the correct ergonomic design. This is why providing an employee with an ergonomic chair should be considered a basic requirement.
So what is the best sitting position ergonomically? Well, the basic rule is that your body angles must be between 100 and 130 degrees. The four areas to concentrate on are your elbows, hips, knees, and feet. See attached drawings. The top of your computer screen should be as close to the eye level as possible. If your seat allows this, it will ensure good blood flow, less pressure on your nerves and cushions between your vertebra and as a result a much more comfortable and productive work day.
Feel free to contact us for any enquiries on products that will make your office more ergonomically friendly.