Hides Julie A, Wong Ian, Wilson Stephen J, Belavý Daniel L, Richardson Carolyn A
Division of Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia.
J Orthop Sports Phys Ther. 2007 Aug;37(8):467-71. doi: 10.2519/jospt.2007.2417.
Cross-sectional study.
To investigate the function of the transversus abdominis (TrA) and internal oblique (10) muscles bilaterally during a simulated weight-bearing task using ultrasound imaging.
An important aspect of neuromuscular control at the lumbopelvic region is stabilization. Biomechanical models have predicted that activation of transversely oriented muscles, such as the TrA and 10 muscles, can stiffen the sacroiliac joints and actively stabilize the pelvis for weight bearing.
Nineteen healthy subjects were positioned in supine lying with their right heel against a footplate linked to a force transducer. Each subject performed a static simulated weight-bearing task of the right lower extremity. Ultrasound imaging was used to assess resultant changes in thickness of the 10 and TrA muscles, as well as the lateral slide of the anterior abdominal fascia on each side of the abdomen alternately. Muscle thickness and slide of the fascia were assessed at standardized force levels (0% and 25% of body weight).
Substantial increases (P < .0001) in mean (+/- SD) thickness of the 10 (18.5% +/- 9.7%) and TrA (24.7% +/- 175%) muscles during the weight-bearing task were measured. Lateral movement (slide) of the anterior abdominal fascia of the TrA muscle also occurred (mean +/- SD, 1.3 +/- 2.0 mm; P = .014) with weight bearing. Changes in muscle thickness and amount of slide were similar for the left and right side of the abdomen (P > or = .11).
The findings are consistent with biomechanical models that predicted symmetrical activation of the deep transversely oriented lumbopelvic muscles in healthy subjects in response to a unilateral functional weight-bearing task. Ultrasound imaging as a measurement tool represents a noninvasive method for measuring abdominal muscle function in functional axial loading.
横断面研究。
使用超声成像研究双侧腹横肌（TrA）和腹内斜肌（IO）在模拟负重任务中的功能。
腰骶部区域神经肌肉控制的一个重要方面是稳定作用。生物力学模型预测，横向定向肌肉（如TrA和IO肌肉）的激活可使骶髂关节变硬，并在负重时积极稳定骨盆。
19名健康受试者仰卧位，右脚跟抵在与力传感器相连的脚板上。每位受试者进行右下肢的静态模拟负重任务。超声成像用于评估IO和TrA肌肉厚度的相应变化，以及交替评估腹部两侧前腹壁筋膜的侧向滑动。在标准化力水平（体重的0%和25%）下评估肌肉厚度和筋膜滑动。
在负重任务期间，测量到IO（18.5%±9.7%）和TrA（24.7%±17.5%）肌肉的平均（±标准差）厚度大幅增加（P <.0001）。负重时TrA肌肉的前腹壁筋膜也发生了侧向移动（滑动）（平均±标准差，1.3±2.0 mm；P =.014）。腹部左右两侧的肌肉厚度变化和滑动量相似（P≥.11）。
这些发现与生物力学模型一致，该模型预测健康受试者在单侧功能性负重任务中，深部横向定向的腰骶部肌肉会对称激活。超声成像作为一种测量工具，是在功能性轴向负荷下测量腹部肌肉功能的一种非侵入性方法。
