Is ‘ideal’ sitting posture real?: Measurement of spinal curves in four sitting postures

Relevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren

“…The second particularity of the cushion used in the present study was that it allowed a dynamic posture, which is often recommended (O 'Sullivan et al, 2012c;Sullivan et al, 2006). In fact, dynamic SP could improve the feeding of the inter-vertebral discs due to compression/decompression movements (Claus et al, 2009). In addition, it might reduce muscular weakening induced by muscular inactivity in a long-term static SP (Baumgartner et al, 2012) and improve lumbar proprioception (Dolan and Green, 2006) and thereby reduce the risk of injuries (Hodges and Moseley, 2003).…”

“…Its use also resulted in a lower posterior tilt of the pelvis and a lumbar lordosis closer to the physiological curvature. Those improvements could reduce intra-discal pressure, which is an important risk factor for low back pain (Claus et al, 2009). On the other hand, a more adequate lumbo-pelvic position does not always result in a corresponding ideal cervico-dorsal position (Annetts et al, 2012).…”

“…Although they remain controversial (Davis et al, 2009;Macedo et al, 2015), several studies since the 1950s have reported the influence of SP on lumbopelvic posture and back complaints (Burton and Eriksen, 2004): traditional furniture increases the posterior tilt of the pelvis and results in an angle between trunk and thighs (trunk-thighs angle) of 90°or less (Lord et al, 1997). This posterior tilt tends to increase the intra-discal pressure even more when the feet do not touch the ground (Claus et al, 2009). Unfortunately, actively maintaining the physiological curves of the spine oneself on traditional furniture is difficult and requires a high level of muscular activity (Caneiro et al, 2010;Waongenngarm et al, 2016).…”

“…However, this recommendation does not take into account the fact that dynamism is also essential in SP. In fact, in a purely static SP, the flow of fluid from the discs may be reduced or reversed (Claus et al, 2009). In addition, prolonged static SP is associated with muscular inactivity that could induce muscular weakening (Baumgartner et al, 2012) with an eventual impact on lumbar proprioception (Dolan and Green, 2006) and consequently more risk of injuries (Hodges and Moseley, 2003).…”

Análisis de la Morfología del Raquis Torácico y Lumbar en Mujeres Trabajadoras de una Cooperativa Hortofrutícola

“…Para mantener una postura correcta, en una tarea específica, es necesaria una compleja interacción entre las funciones biomecánicas y neuromusculares con objeto de mantener la seguridad en los segmentos raquídeos (Claus et al, 2009). Cuando se produce una alteración en la morfología de los cuerpos vertebrales, se modifica la funcionalidad de los discos intervertebrales y estructuras ligamentosas de la columna vertebral en condiciones estáticas, provocando que los movimientos y posturas adoptadas por el raquis producen un aumento del estrés vertebral.…”