Pinto Rafael Z, Ferreira Paulo H, Franco Marcia R, Ferreira Manuela L, Ferreira Mariana C, Teixeira-Salmela Luci F, Maher Christopher G
The George Institute for Global Health, Sydney Medical School, University of Sydney, Sydney, Australia.
J Manipulative Physiol Ther. 2011 Mar-Apr;34(3):164-72. doi: 10.1016/j.jmpt.2011.02.009.
The present study investigated the effect of 2 different lumbar spine postures, neutral and flexed lumbar postures, on transversus abdominis (TrA) muscle function during a voluntary contraction (hollowing and draw-in maneuver) in people with and without low back pain (LBP).
Thirty participants with LBP and 30 healthy participants were recruited for this cross-sectional study. Transversus abdominis muscle function was measured as a change in thickness with ultrasound imaging. Participants performed voluntary TrA contraction in a supine lying position with the lumbar spine in neutral and flexed postures. Data were analyzed using a 2-way (groups, postures) analysis of variance.
Lumbar posture influenced TrA function during a voluntary contraction in people with and without LBP. There was a significant main effect of posture (F(1,58) = 16.140, P < .001). Neutral lumbar posture improved participants' ability to recruit TrA in both group (mean difference, 7.5%; 95% confidence interval, 3.8%-11.3%). No significant differences were found between healthy subjects and those with LBP.
The results of the present study showed that, in subjects performing a voluntary TrA contraction, the neutral lumbar posture improves the ability to increase change in TrA thickness. This study found no significant difference in TrA thickness change between healthy subjects and those with nonspecific LBP.
本研究调查了两种不同的腰椎姿势，即腰椎中立位和屈曲位，对有和没有下背痛（LBP）的人群在自主收缩（收腹和吸气动作）过程中腹横肌（TrA）功能的影响。
招募了30名患有LBP的参与者和30名健康参与者进行这项横断面研究。通过超声成像测量腹横肌厚度变化来评估其肌肉功能。参与者在仰卧位时，腰椎分别处于中立位和屈曲位进行腹横肌自主收缩。使用双向（组、姿势）方差分析对数据进行分析。
腰椎姿势对有和没有LBP的人群在自主收缩过程中的腹横肌功能有影响。姿势存在显著的主效应（F(1,58) = 16.140，P <.001）。腰椎中立位提高了两组参与者募集腹横肌的能力（平均差异为7.5%；95%置信区间为3.8%-11.3%）。健康受试者和患有LBP的受试者之间未发现显著差异。
本研究结果表明，在进行腹横肌自主收缩的受试者中，腰椎中立位可提高腹横肌厚度变化的增加能力。本研究发现健康受试者和患有非特异性LBP的受试者在腹横肌厚度变化方面无显著差异。
