Abstract
This study determined differences in spinal-pelvic kinematics sitting on (i) mat (ii) block and (iii) novel 10º forward inclined wedge (ButtaflyTM) in a same-subject repeated measures cross-over design in 60 healthy individuals (34 females). Repeated measures ANOVA revealed statistically significant differences between sitting conditions and lumbar and pelvic sagittal angles. Both, the inclined wedge and the block seating aids reduced overall flexion, but the inclined wedge had a greater influence in the lumbar region whilst the block induced the greatest change in the pelvis. This may be relevant for seating aid design personalised to posture type. Statistically significant gender differences were identified in all 3 seating conditions with males adopting more flexed lumbar spine and posteriorly tilted pelvis. Females flexed less in thoracic spine when sitting on an inclined wedge and a block. These statistically significant differences between males and females may provide first explorative direction for bespoke seating aids design.
Highlights
Seating aids are commonly used to optimise sitting posture and as an adjunct in exercise interventions
This study investigated the effect of Yoga mat, Yoga block and a novel design ButtaflyTM wedge on a spinal curvature and pelvic tilt during cross-legged sitting in healthy individuals
This is a first study that evaluated the effect of novel floor seating devices designed to reduce discomfort during exercise such as Yoga and Pilates frequently utilised in low back pain (LBP) management
Summary
Seating aids are commonly used to optimise sitting posture and as an adjunct in exercise interventions. For example, may optimise posture in individuals with habitually flexed posture types. This has been demonstrated in research evaluating individuals reporting flexion related low back pain (LBP) and presenting with flattened lumbar curvatures (O’Keeffe, Dankaerts, O’Sullivan, O’Sullivan, & O’Sullivan, 2013). Individuals with extension related LBP who present with hyperlordotic postures reported increased symptoms with seating aids further encouraging lumbar extension (Curran, Dankaerts, O’Sullivan, O’Sullivan, & O’Sullivan, 2014)
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