Reeve Angelica, Dilley Andrew
19th Street Physiotherapy Clinic, Vancouver V7M1X5, Canada.
Man Ther. 2009 Dec;14(6):679-84. doi: 10.1016/j.math.2009.02.008. Epub 2009 May 14.
The role of transversus abdominis (TrA) on spinal stability may be important in low back pain (LBP). To date, there have not been any investigations into the influence of lumbo-pelvic neutral posture on TrA activity. The present study therefore examines whether posture influences TrA thickness. A normative within-subjects single-group study was carried out. Twenty healthy adults were recruited and taught five postures: (1) supine lying; (2) erect sitting (lumbo-pelvic neutral); (3) slouched sitting; (4) erect standing (lumbo-pelvic neutral); (5) sway-back standing. In each position, TrA thickness was measured (as an indirect measure of muscle activity) using ultrasound. In erect standing, TrA (mean TrA thickness: 4.63+/-1.35 mm) was significantly thicker than in sway-back standing (mean TrA thickness: 3.32+/-0.95 mm) (p=00001). Similarly, in erect sitting TrA (mean thickness=4.30 mm+/-1.58 mm) was found to be significantly thicker than in slouched sitting (mean thickness=3.46 mm+/-1.13 mm) (p=0002). In conclusion, lumbo-pelvic neutral postures may have a positive influence on spinal stability compared to equivalent poor postures (slouched sitting and sway-back standing) through the recruitment of TrA. Therefore, posture may be important for rehabilitation in patients with LBP.
腹横肌（TrA）在脊柱稳定性方面的作用可能对下背痛（LBP）至关重要。迄今为止，尚未有关于腰骨盆中立位姿势对TrA活动影响的研究。因此，本研究旨在探讨姿势是否会影响TrA厚度。进行了一项规范性的单组受试者内研究。招募了20名健康成年人，并教授他们五种姿势：（1）仰卧位；（2）直立坐姿（腰骨盆中立位）；（3）弯腰坐姿；（4）直立站姿（腰骨盆中立位）；（5）驼背站姿。在每个姿势下，使用超声测量TrA厚度（作为肌肉活动的间接测量指标）。在直立站姿下，TrA（平均TrA厚度：4.63±1.35毫米）明显比驼背站姿（平均TrA厚度：3.32±0.95毫米）厚（p = 0.0001）。同样，在直立坐姿下，TrA（平均厚度 = 4.30毫米±1.58毫米）明显比弯腰坐姿（平均厚度 = 3.46毫米±1.13毫米）厚（p = 0.0002）。总之，与等效的不良姿势（弯腰坐姿和驼背站姿）相比，腰骨盆中立位姿势可能通过募集TrA对脊柱稳定性产生积极影响。因此，姿势对于LBP患者的康复可能很重要。
