School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Queensland, Australia.
Clinical Biomechanics Laboratory, Department of Physical Therapy, University of Chile, Santiago, Chile.
J Anat. 2022 Mar;240(3):579-588. doi: 10.1111/joa.13575. Epub 2021 Oct 26.
Motion of the fascial layers of the iliotibial band (ITB), as a reinforcement of the deep fascia lata, is likely to be relevant for its function and mechanical behaviour. This exploratory study aimed to evaluate the ITB fascial layers displacement during a weight shift task. Thirteen pain-free runners performed a 6-second standing weight shift task. B-mode ultrasound imaging using an automated fascicle tracking algorithm was used to measure proximal and distal displacement of superficial and deep ITB layers at the middle region. To study the potential contributors to individual variation of fascial motion, we recorded the activity of five hip/thigh muscles with electromyography (EMG), thigh/pelvis/trunk position with accelerometers, and centre of pressure with a force plate. Linear regressions estimated the relationship between displacement of fascial layers and hip/trunk angles. Independent t-tests or Fisher's exact tests compared EMG and movement-related parameters between participants who demonstrated motion of the fascia in the proximal and distal directions. Thickness of the ITB and the loose connective tissue between its layers were calculated. Proximal displacement was observed in six (-4.1 ± 1.9 mm [superficial]) and two (-6.2 ± 2.0 mm [deep]) participants. Distal displacement was observed for seven participants for each layer (3.1 ± 1.1 mm [superficial]; 3.6 ± 1.3 mm [deep]). Four participants did not show displacement of the deep layer. Trunk lateral flexion and gluteus medius muscle activity were determinants of proximal motion of the superficial layer. Loose connective tissue was thinner in participants without displacement of the deep layer. Displacement of the ITB fascial layers varies between individuals. Variation related to differences in joint movements and muscle activity. This study highlights the complex interaction between fascia and movement.
阔筋膜张肌筋膜层（ITB）的运动，作为阔筋膜浅层的增强，可能与其功能和力学行为有关。本探索性研究旨在评估 ITB 筋膜层在重量转移任务中的位移。13 名无痛跑步者进行了 6 秒的站立重量转移任务。使用自动肌纤维跟踪算法的 B 型超声成像用于测量中间区域浅层和深层 ITB 层的近端和远端位移。为了研究筋膜运动个体差异的潜在影响因素，我们使用肌电图（EMG）记录了 5 块髋/大腿肌肉的活动、加速度计记录了大腿/骨盆/躯干的位置、力板记录了中心压力。线性回归估计了筋膜层位移与髋/躯干角度之间的关系。独立 t 检验或 Fisher 确切检验比较了在近端和远端方向显示筋膜运动的参与者之间的 EMG 和与运动相关的参数。测量了 ITB 的厚度和其各层之间的疏松结缔组织。在 6 名（浅层为-4.1±1.9mm）和 2 名（深层为-6.2±2.0mm）参与者中观察到近端位移。对于每个层，有 7 名参与者观察到远端位移（浅层为 3.1±1.1mm；深层为 3.6±1.3mm）。有 4 名参与者的深层层没有显示位移。躯干侧向弯曲和臀中肌肌肉活动是浅层近端运动的决定因素。在深层层没有位移的参与者中，疏松结缔组织更薄。ITB 筋膜层的位移在个体之间存在差异。这种差异与关节运动和肌肉活动的差异有关。本研究强调了筋膜和运动之间的复杂相互作用。
