How long has “sitting” been proposed as a mechanism for LBP?

In regards the occupational incidence of LBP Nechemson, in 1980 stated that: LBP occurs with about the same frequency in sedentary occupations as those involved in heavy labor. Sitting, especially prolonged sitting is frequently referred to as a potential hazard for development of LBP, a risk that is increased when driving. In general sitting for any length of time results in slouched sitting…in examination it will be found most sit with spine in full flexion. The few who sit upright do so to mitigate pain.

McKenzie (1979) concludes that poor sitting posture is the main predisposing factor to mechanical back pain…this constitutes an inherent fault in our lifestyle. (It is generally accepted now…and it was also accepted in the 1970’s) that LBP can be aggravated and perpetuated by poor and excessive sitting. McKenzie: “it is the responsibility of the therapist to advise and instruct the patient in ergonomic and other methods to reduce and modify postural stress and eliminate predisposing factors” (1979).