Methods: Twenty-one female computer workers participated. Surface electromyographic activity was
recorded from lumbar multifidus, longissimus, and iliocostalis throughout the workday. Simultaneous
inclinometer recordings from pelvis, upper trunk, and left thigh were used to determine back posture
and identify periods with sitting, standing, and walking. Low back pain intensity was recorded by visual
analogue scale every hour throughout the work and leisure periods.