Poor posture in sitting:
With the head, back and trunk in flexed/forward position results in fatigue of the muscles if this position is held for long periods or creating repetitive movements. Causes the pelvis to rock backwards, flattening out the low back lordotic curvature, stretching the ligaments that support the spine, fatigueing the musculature as well as increasing intradiscal pressures. Prolonged sitting prevents variation in movement, reducing flow of nutrients to the disc. So microbreaks are designed to encourage frequent changes in posture, increases blood flow and nutrients into the disc and other soft tissue structures and enable stretching of the low back musculature.
(Occupational Therapy and Physical Dysfunction 5th Edition Annie Turner, Marg Foster, Sybil E Johnson pg 535)
