Matsubayashi Takeo, Kubo Junjiro, Matsuo Akifumi, Kobayashi Kando, Ishii Naokata
Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo, Japan.
J Physiol Sci. 2008 Oct;58(5):323-32. doi: 10.2170/physiolsci.RP011107. Epub 2008 Oct 9.
The purpose of this study was to examine the validity of using ultrasonography for detecting the force generated by the psoas major muscle, a muscle positioned in the deep trunk. We measured the displacement of central tendon on B-mode ultrasound images of two different longitudinal sections of the muscle during passive hip flexion-extension and isometric hip flexion at varied hip angles. In both tasks, the values of tendon displacement obtained independently from each section coincided well, indicating that tendon displacement took place along a straight trajectory, i.e., close to the nodal line between two scanned planes. It was strongly correlated with both the hip angle (R(2) = 0.98) and the hip-flexion torque (R(2) = 0.83). In the second set of experiment, we measured the tendon displacement during dynamic movements with the combination of ultrasonography and VICON-based motion analysis. From the tendon displacement during dynamic thigh lifting and walking, the force generated by the muscle could be estimated by extracting the force-related component. These results indicate that ultrasonography of the psoas major muscle can measure the displacement of its central tendon accompanied with either length change of the muscle or the elongation of tendon. Although much attention has to be paid to the limitations of this methodology, ultrasonography may be useful for detecting the force generation of the muscle during a variety of dynamic movements.
本研究的目的是检验使用超声检查来检测腰大肌（位于躯干深部的一块肌肉）产生的力量的有效性。我们在被动髋关节屈伸以及不同髋关节角度的等长髋关节屈曲过程中，测量了该肌肉两个不同纵向切面的B超图像上中央腱的位移。在这两项任务中，从每个切面独立获得的腱位移值吻合良好，表明腱位移沿着一条直线轨迹发生，即接近两个扫描平面之间的节线。它与髋关节角度（R² = 0.98）和髋关节屈曲扭矩（R² = 0.83）均密切相关。在第二组实验中，我们结合超声检查和基于VICON的运动分析，测量了动态运动过程中的腱位移。根据动态抬腿和行走过程中的腱位移，通过提取与力相关的分量，可以估算出该肌肉产生的力量。这些结果表明，腰大肌的超声检查可以测量其中央腱的位移，该位移伴随着肌肉长度的变化或腱的伸长。尽管必须充分注意这种方法的局限性，但超声检查可能有助于检测各种动态运动过程中肌肉产生的力量。
