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A saddle chair uses the same principles in its design as an equestrian saddle. It is equipped with a chair base on castors and a gas cylinder for adjusting the correct sitting height. The castors enable moving around and reaching out for objects while sitting. Some saddle chairs have backrests, but most do not.
Riding-like sitting on a saddle chair differs from sitting on a conventional chair. Saddle chair users sit 20–30 cm higher, which puts the hips and the knees into a 135° angle, compared to the 90° angle typically associated with sitting on a traditional chair.
Because the saddle chair is higher than a normal office chair, the desk has to be higher as well. For this purpose there are desks that can be electronically or mechanically adjusted to fit the user. A saddle chair can also be used with a normal office desk, but then the desk has to be lifted up with height extension pieces.
The saddle chair seat is either solid or divided. A divided seat reduces pressure on the perineum and lowers the temperature in the genital area. A divided seat is thought to be healthier, especially for men, than a solid seat.
High quality saddle chairs include not only height adjustments but also a tilt mechanism. There is also a divided saddle chair model on the market that has an adjustable gap between the two seat parts. Accessories, such as elbow and wrist supports, are available for saddle chairs to make different work tasks easier.
Adapting to a saddle chair takes time and requires a new kind of attitude towards sitting. The most common reason for using a saddle chair is that the users feel it is healthier for the back and legs than a standard chair. An intervention study on schoolchildren found that saddle chairs were liked better, but the difference leveled off over time.
- Andris Freivalds (2004). Biomechanics of the Upper Limbs: Mechanics, Modelling and Musculoskeletal Injuries. Taylor & Francis. p. 494. ISBN 978-0-7484-0926-6. Retrieved 12 May 2013.
- Nordic Council of Ministers (2012). Growth, creativity and innovation in the Nordic countries. Copenhagen: Nordic Council of Ministers. pp. 40–41. ISBN 978-92-893-2307-9. Retrieved 12 May 2013.
- Saarni, Lea (2009-04-25). Kontrolloitu interventiotutkimus koulutyöpisteiden vaikutuksista koululaisten tuki- ja liikuntaelinten terveyteen (with English abstract) (Thesis). University of Tampere, Finland. ISBN 978-951-44-7634-1. ISSN 1455-1616. Retrieved 2010-08-28.
- Reijo Koskelo, Risto Pohjolainen, Osmo Hänninen: The function responses of upper secondary school students considering the saddle chair and the adjustable table. University of Kuopio. 1999-2000.