Changes in sitting posture induce multiplanar changes in chest wall shape and motion with breathing

Feedback Respiratory Training to Enhance Chest Expansion and Pulmonary Function in Chronic Stroke: A Double-Blind, Randomized Controlled Study

“…Interestingly, Sahin et al 27) reported a positive correlation between chest expansion and maximal inspiratory pressure (MIP) in patients with ankylosing spondylolitis. Moreover, displacement of the ribcage in the lateral outward direction during inspiration in normal subjects using an automatic motion analyzer was greater than the displacement during tidal breathing 28) , and lateral movement of the ribcage at the level of the 4th rib during inspiration was increased in the neutral posture using an electromagnetic tracking device in healthy subjects 29) . Thus, these findings support the use of FRT as an effective chest expansion method for patients following a stroke.…”

Volume Rather Than Flow Incentive Spirometry Is Effective in Improving Chest Wall Expansion and Abdominal Displacement Using Optoelectronic Plethysmography

“…12,25 This is because the geometry of the respiratory muscles is strongly influenced by posture. For instance, the diaphragm has a reduced capacity to generate strength in the supine position.…”

Changes in Regional Activity of the Psoas Major and Quadratus Lumborum With Voluntary Trunk and Hip Tasks and Different Spinal Curvatures in Sitting

“…In contrast, during the slump sitting posture, abdominal compliance is reduced; hence, in the slump sitting posture there is increased dependence on thoracic expansion and less activity of the diaphragm for inspiration than in the short lordosis posture. 15 ES and OI/TrA EMG modulated with respiratory phases only in the short lordosis posture. The contribution of ES and OI/TrA to respiration may be greater in short lordosis, due to the mechanical advantage of muscles in generating respiratory movements and breathing pattern, which involves spinal extension in inspiration and abdominal displacement in expiration.…”

“…This may be explained by greater activity of QL during this phase in specific postures, as a result of changes in breathing dynamics with changes in posture. 15 The short lordosis posture is likely to favor QL, as this posture is associated with even distribution of motion of the abdomen and lower rib cage, which is generated by diaphragm contraction. Thus, it could be argued that activation of QL-a may aid in stabilizing the attachment of the diaphragm at the 12th rib.…”