Saddle chair
The saddle chair is a chair that resembles a light riding saddle . The seat height is 20-30 cm higher than a conventional chair, so the saddle chair is mostly used in conjunction with a height-adjustable table. A saddle chair is usually equipped with a gas spring and castors.
The saddle chair is used by dentists, physiotherapists, opticians, hairdressers, office workers and other professional groups who sit a lot while working and have to move around at the same time.
development
Various saddle chairs have been developed since the 1980s. The pioneers include the Finn Veli-Jussi Jalkanen with the Salli saddle chair and the Australian Mary Gale with the Bambach saddle seat . Since then, more and more designers and companies have tried different saddle seat variations.
Scientific evaluation
In a traditional chair, the back and thighs and the upper and lower legs are usually at a 90 degree angle, whereas the saddle chair allows an angle of about 135 degrees. The German orthopedic surgeon Hannes Schoberth proved with X-rays as early as 1962 that the hip joint can only bend about 60 degrees. According to this, an angle of 90 degrees in the hip joint can only be achieved by leaning the pelvis backwards. However, the backrest of a normal chair forces the back into an upright position and thus the lordosis and kyphosis of the spine are straightened.
In a study in 2006, it was shown on the basis of magnetic resonance tomography images that the hip angle of 90 degrees recommended today leads to unnatural stresses on the intervertebral discs and is therefore not recommended.
There are only small, controlled studies with small numbers of cases on the effects of sitting and working , which have shown mixed results. In a study with four people, the Bambach saddle chair caused less pain in the lower back, but increased discomfort in the legs, hips and buttocks. The Bambach saddle chair did not have any impact on work performance. Another study did not find any significant differences between saddle and normal chairs in around 100 school children.
Individual evidence
- ↑ acmandal.com
- ^ Hanns Schoberth: Sitting posture, seat damage, seating furniture. Springer, 1962, OCLC 8611879 .
- ↑ EN 1335 parts 1–3
- ↑ Ergonomics checked
- ↑ rsna2006.rsna.org ( Memento of the original from March 8, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ K. Gadge, E. Innes: An investigation into the immediate effects on comfort, productivity and posture of the Bambach saddle seat and a standard office chair. In: Work. 29 (3), 2007, pp. 189-203. PMID 17942990 .
- ↑ L. Saarni, CH Nygård, T. Nummi, A. Kaukiainen, A. Rimpelä: Comparing the effects of two school workstations on spine positions and mobility, and opinions on the workstations - A 2-year controlled intervention. In: International Journal of Industrial Ergonomics. Volume 39, Issue 6, November 2009, pp. 981-987. doi: 10.1016 / j.ergon.2009.08.006
