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- W2108550153 abstract "Posteroanterior stiffness of the lumbar spine is influenced by factors, including trunk muscle activity and intra-abdominal pressure (IAP). Because these factors vary with breathing, this study investigated whether stiffness is modulated in a cyclical manner with respiration. A further aim was to investigate the relationship between stiffness and IAP or abdominal and paraspinal muscle activity. Stiffness was measured from force-displacement responses of a posteroanterior force applied over the spinous process of L 2 and L 4 . Recordings were made of IAP and electromyographic activity from L 4 /L 2 erector spinae, abdominal muscles, and chest wall. Stiffness was measured with the lung volume held at the extremes of tidal volume and at greater and lesser volumes. Stiffness at L 4 and L 2 increased above base-level values at functional residual capacity (L 2 14.9 N/mm and L 4 15.3 N/mm) with both inspiratory and expiratory efforts. The increase was related to the respiratory effort and was greatest during maximum expiration (L 2 24.9 N/mm and L 4 23.9 N/mm). The results indicate that changes in trunk muscle activity and IAP with respiratory efforts modulate spinal stiffness. In addition, the diaphragm may augment spinal stiffness via attachment of its crural fibers to the lumbar vertebrae." @default.
- W2108550153 created "2016-06-24" @default.
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- W2108550153 date "2003-10-01" @default.
- W2108550153 modified "2023-09-26" @default.
- W2108550153 title "Spinal stiffness changes throughout the respiratory cycle" @default.
- W2108550153 cites W1803652129 @default.
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- W2108550153 doi "https://doi.org/10.1152/japplphysiol.00939.2002" @default.
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