Estimation of moments acting on the pelvis in standing and in two different sitting postures

Abstract

Abstract According to popular consideration prolonged sitting posture in work can cause pain at different regions of the back. Many researches aiming to defi ne the relationship between these two, and as a result of noticing the problem many design solutions can be found, some of which are considered as alternative. Healthy sitting posture should be mean that with anterior rotation of the pelvis the curve of the lumbar spine would be neutral or more preferably lordotic. In sitting the muscle balance changes thus there is more muscle activity needed for erection of the trunk and anterior rotation of the pelvis. In this study muscle activity in standing and in two different sitting postures is estimated as a difference of the two moments acting on the pelvis, which are the upper body weight moment and the passive elastic moment. Further investigation of the effects of hip-fl exing thigh muscles or other passive tissues on pelvic range of motion is warranted. DOI:  10.17489/biohun/2014/2/05