Sitting

"Sit" redirects here. For other uses, see Sit (disambiguation).
Sitzender Junge ("Sitting boy") by Werner Stötzer, 1956

Sitting is a basic human resting position. The body weight is supported primarily by the buttocks in contact with the ground or a horizontal object such as a chair seat. The torso is more or less upright. Sitting for much of the day may pose significant health risks, and people who sit regularly for prolonged periods have higher mortality rates than those who do not.[1]

The form of kneeling where the thighs are near horizontal and the buttocks rest on the heels, for example as in Seiza and Vajrasana (yoga), is also often interpreted as sitting.

Role and evolution

Women reclining in chairs. Painting by Jean-François de Troy.
Börje Ahlstedt sitting on a chair

Although chairs with backrests have only been common in Europe since the 16th century and office workers sitting at work was uncommon even in the early 20th century,[2] the British Chiropractic Association said in 2006 that 32% of the British population spent more than ten hours per day sitting down.[3]

Positions

On the floor

The most common ways of sitting on the floor involves bending the knees. One can also sit with the legs unbent, using something solid as support for the back or leaning on one's arms. Sitting with bent legs can be done with the legs mostly parallel or by crossing them over each other.

A common cross-legged position is with the lower part of both legs folded towards the body, crossing each other at the ankle or calf, with both ankles on the floor, sometimes with the feet tucked under the knees or thighs. The position is known in several European languages as tailor style, from the traditional working posture of tailors;[4] compare tailor's bunion. It is also named after various plains-dwelling nomads: in American English Indian style, in many European languages "Turkish style", and in Japanese agura (胡座 The sitting style of non-Han ethnics (particularly Turks, Mongols and other Central Asians.)). In yoga it is known as sukhasana.

On a raised seat

An Indian Buddha, seated

Most raised surfaces at the appropriate height can be used as seats for humans, whether they are made for the purpose, such as chairs, stools and benches, or not. While the buttocks are nearly always rested on the raised surface, there are many differences in how one can hold one's legs and back.

There are two major styles of sitting on a raised surface. The first has one or two of the legs in front of the sitting person; in the second, sitting astride something, the legs incline outwards on either side of the body.

The feet can rest on the floor, or on a footrest, which can keep them vertical, horizontal, or at an angle in between. They can also dangle if the seat is sufficiently high. Legs can be kept right to the front of the body, spread apart, or one crossed over the other.

The upper body can be held upright, recline to either side or backwards, or one can lean forward.

Yoga, traditions, and spirituality

The Japanese tea ceremony is performed sitting in seiza.

There are many seated positions in various traditions and rituals. Four examples are:

In various mythologies and folk magic, sitting is a magical act that connects the person who sits with other persons, states or places.[5]

Health risks

Back of a sitting nude by school of Rembrandt

There is a significantly higher mortality rate among people who regularly sit for prolonged periods, and the risk is not negated by regular exercise, though it is lowered.[1][6] The causes of mortality and morbidity include heart disease, obesity, type 2 diabetes and cancer, specifically, breast, endometrial, colorectal, lung, and epithelial ovarian cancer.[1][6][7][8][9] The link between heart disease and diabetes mortality and sitting is well-established, but the risk of cancer mortality is unclear.[8][10] Sedentary time is also associated with an increased risk of depression in children and adolescents.[11] A correlation between occupational sitting specifically and higher body mass index has been demonstrated, but causality has not yet been established.[6] There are several hypotheses explaining why sitting is a health risk. These include changes in cardiac output, vitamin D, inflammation, sex hormone activity, lipoprotein lipase activity, and GLUT4 activity due to long periods of muscular unloading, among others.[6][8][9]

Sitting may occupy up to half of an adult's workday in developed countries.[6] Workplace programs to reduce sitting vary in method. They include sit-stand desks, counseling, workplace policy changes, walking/standing meetings, treadmill desks, breaks, therapy ball chairs, and stepping devices.[7][12] Results of these programs are mixed,[7] but there is moderate evidence to show that changes to chairs (adjusting the biomechanics of the chair or using different types of chairs) can effectively reduce musculoskeletal symptoms in workers who sit for most of their day.[13]

Public health programs typically focus on increasing physical activity rather than reducing sitting time.[1][14] One major target for these public health programs is sitting in the workplace.[7][12] For example, WHO Europe recommended in September 2015 the provision of adjustable desks in the workplace.[14] In general, there is conflicting evidence regarding the precise risks of sitting for long periods.[6] A 2015 Cochrane review found low-quality evidence for sit-stand desks and/or counseling as effective workplace programs to reduce the total time spent sitting and the number of instances of long-term sitting.[12] As there are many new studies under way, the Cochrane Review is being updated, with the help of a crowd funding campaign that runs from September 2015 till December 2015.[15]

Kneeling chairs

The kneeling chair (often just referred to as "ergonomic chair") was designed to encourage better posture than the conventional chair. To sit in a kneeling chair, one rests one's buttocks on the upper sloping pad and rests the front of the lower legs atop the lower pad, i.e., the human position as both sitting and kneeling at the same time.

See also

References

  1. 1 2 3 4 Biswas, A; Oh, PI; Faulkner, GE; Bajaj, RR; Silver, MA; Mitchell, MS; Alter, DA (2015). "Sedentary Time and Its Association With Risk for Disease Incidence, Mortality, and Hospitalization in Adults: A Systematic Review and Meta-analysis". Annals of Internal Medicine. 162 (2): 123–32. doi:10.7326/M14-1651. PMID 25599350.
  2. ↑ "Sitting down can send you to an early grave: Why sofas (and your office chair) should carry a health warning...". dailymail.co.uk. March 3, 2013. Retrieved February 20, 2015. Chairs with backs only became available to the affluent in Europe around the 13th century, and it was not until the 16th century that they became common. Until then, the chest, bench or stool were the everyday seats. Sitting at work is a recent fad, as well. In the 19th and early 20th centuries, office workers such as clerks, accountants and managers mostly stood. Sitting was equated with slacking.
  3. ↑ "Sitting straight 'bad for backs'". BBC. November 28, 2006. Retrieved February 20, 2015.
  4. ↑ "The Art of the Cut". History.org. Retrieved 2012-03-16.
  5. ↑ Čajkanović, Veselin; Živković, Marko (translator) (1996). "Magical Sitting". Anthropology of East Europe Review. 14 (1). Retrieved 2007-07-09. It is obvious from all the above that sitting, seen from the viewpoint of the history of religion, could be a magical act which, within the framework of analogic magic, will establish a certain relationship, a covenant. Cite uses deprecated parameter |coauthors= (help)
  6. 1 2 3 4 5 6 van Uffelen, Jannique G. Z.; Wong, Jason; Chau, Josephine Y.; van der Ploeg, Hidde P.; Riphagen, Ingrid; Gilson, Nicholas D.; Burton, Nicola W.; Healy, Genevieve N.; Thorp, Alicia A. (Oct 2010). "Occupational sitting and health risks: a systematic review". American Journal of Preventive Medicine. 39 (4): 379–388. doi:10.1016/j.amepre.2010.05.024. ISSN 1873-2607. PMID 20837291.
  7. 1 2 3 4 Chau, Josephine Y.; der Ploeg, Hidde P. van; van Uffelen, Jannique G. Z.; Wong, Jason; Riphagen, Ingrid; Healy, Genevieve N.; Gilson, Nicholas D.; Dunstan, David W.; Bauman, Adrian E. (Nov 2010). "Are workplace interventions to reduce sitting effective? A systematic review". Preventive Medicine. 51 (5): 352–356. doi:10.1016/j.ypmed.2010.08.012. ISSN 1096-0260. PMID 20801153.
  8. 1 2 3 Proper, Karin I.; Singh, Amika S.; van Mechelen, Willem; Chinapaw, Mai J. M. (Feb 2011). "Sedentary behaviors and health outcomes among adults: a systematic review of prospective studies". American Journal of Preventive Medicine. 40 (2): 174–182. doi:10.1016/j.amepre.2010.10.015. ISSN 1873-2607. PMID 21238866.
  9. 1 2 Lynch, Brigid M. (Nov 2010). "Sedentary behavior and cancer: a systematic review of the literature and proposed biological mechanisms". Cancer Epidemiology, Biomarkers & Prevention. 19 (11): 2691–2709. doi:10.1158/1055-9965.EPI-10-0815. ISSN 1538-7755. PMID 20833969.
  10. ↑ Wilmot, E. G.; Edwardson, C. L.; Achana, F. A.; Davies, M. J.; Gorely, T.; Gray, L. J.; Khunti, K.; Yates, T.; Biddle, S. J. H. (14 August 2012). "Sedentary time in adults and the association with diabetes, cardiovascular disease and death: systematic review and meta-analysis". Diabetologia. 55 (11): 2895–2905. doi:10.1007/s00125-012-2677-z.
  11. ↑ Liu, M; Wu, L; Yao, S (9 November 2015). "Dose-response association of screen time-based sedentary behaviour in children and adolescents and depression: a meta-analysis of observational studies.". British Journal of Sports Medicine. doi:10.1136/bjsports-2015-095084. PMID 26552416.
  12. 1 2 3 Shrestha, Nipun; Kukkonen-Harjula, Katriina T; Verbeek, Jos H; Ijaz, Sharea; Hermans, Veerle; Bhaumik, Soumyadeep (2016). "Workplace interventions for reducing sitting at work". The Cochrane Database of Systematic Reviews (3): CD010912. doi:10.1002/14651858.CD010912.pub3. PMID 26984326.
  13. ↑ van Niekerk, Sjan-Mari; Louw, Quinette Abigail; Hillier, Susan (2012). "The effectiveness of a chair intervention in the workplace to reduce musculoskeletal symptoms. A systematic review". BMC musculoskeletal disorders. 13: 145. doi:10.1186/1471-2474-13-145. ISSN 1471-2474. PMC 3552974Freely accessible. PMID 22889123.
  14. 1 2 Europe, WHO (September 2015). "World Health Organization" (PDF). WHO. WHO. Retrieved October 7, 2015.
  15. ↑ Verbeek, Jos (September 16, 2015). "How to sit less at work". How to sit less at work. mesenaatti.me. Retrieved October 7, 2015.

Further reading

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