Laboratory of Neuromechanics, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Greece.
Laboratory of Neuromechanics, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Greece.
J Electromyogr Kinesiol. 2022 Feb;62:102619. doi: 10.1016/j.jelekin.2021.102619. Epub 2021 Nov 15.
Exercise responses and injury rates differ between individual hamstrings and this may be linked with their morphology. The aim of this study was to compare muscle length and tendon dimensions between the individual hamstrings at two knee joint angles using free hand three-dimensional ultrasound (3D US). Muscle-tendon length and distal tendon cross-sectional area (CSA), volume, length and echogenicity of biceps femoris long (BFlh) and short (BFsh) head, semimembranosus (SM) and semitendinosus (ST) of 16 individuals were measured using free-hand 3D US at 0° (full extension) and 45° of knee flexion. ST showed the greatest length than all muscles and BFsh the lowest (p < 0.05). No difference was observed between SM and BFlh length (p > 0.05). Of the four muscles, ST tendon was longer, with less volume and CSA but greater echogenicity than the other tendons. In contrast, SM and BFlh showed shorter tendons and lower echogenicity but a greater volume and CSA than ST (p < 0.05). Muscle and tendon lengthened from 45° to 0° knee flexion angle (p < 0.05) but this change was not statistically different between individual hamstrings (p > 0.05). Freehand 3D US indicated that hamstring muscle length and distal tendon dimensions differ between individual hamstrings. All muscles and tendons lengthened as the knee was extended but this change was similar for all individual hamstrings.
个体腘绳肌的运动反应和损伤率不同，这可能与其形态有关。本研究旨在使用自由手三维超声（3D US）比较两个膝关节角度下个体腘绳肌的肌肉长度和肌腱尺寸。使用自由手 3D US 在 0°（完全伸展）和 45°膝关节屈曲时测量 16 名个体的长（BFlh）和短（BFsh）头、半膜肌（SM）和半腱肌（ST）的股二头肌、肌腱长度和远端肌腱横截面积（CSA）、体积、长度和回声。ST 的长度大于所有肌肉，BFsh 的长度最短（p<0.05）。SM 和 BFlh 的长度无差异（p>0.05）。在这四块肌肉中，ST 的肌腱较长，体积和 CSA 较小，但回声较高。相比之下，SM 和 BFlh 的肌腱较短，回声较低，但体积和 CSA 大于 ST（p<0.05）。肌肉和肌腱从 45°到 0°膝关节屈曲角度延长（p<0.05），但个体腘绳肌之间的这种变化没有统计学差异（p>0.05）。自由手 3D US 表明，个体腘绳肌的肌肉长度和远端肌腱尺寸不同。随着膝关节的伸展，所有肌肉和肌腱都变长，但这种变化在所有个体腘绳肌中都相似。
