Nescolarde L, Yanguas J, Lukaski H, Alomar X, Rosell-Ferrer J, Rodas G
Department of Electronic Engineering, Universitat Politècnica de Catalunya, c/ Jordi Girona 1-3, 08034 Barcelona, Spain.
Physiol Meas. 2015 Jan;36(1):27-42. doi: 10.1088/0967-3334/36/1/27. Epub 2014 Dec 11.
Muscle injuries in the lower limb are common among professional football players. Classification is made according to severity and is diagnosed with radiological assessment as: grade I (minor strain or minor injury), grade II (partial rupture, moderate injury) and grade III (complete rupture, severe injury). Tetrapolar localized bioimpedance analysis (BIA) at 50 kHz made with a phase-sensitive analyzer was used to assess damage to the integrity of muscle structures and the fluid accumulation 24 h after injury in 21 injuries in the quadriceps, hamstring and calf, and was diagnosed with magnetic resonance imaging (MRI). The aim of this study was to identify the pattern of change in BIA variables as indicators of fluid [resistance (R)] and cell structure integrity [reactance (Xc) and phase angle (PA)] according to the severity of the MRI-defined injury. The % difference compared to the non-injured contralateral muscle also measured 24-h after injury of R, Xc and PA were respectively: grade I (n = 11; -10.4, -17.5 and -9.0%), grade II (n = 8; -18.4, -32.9 and -16.6%) and grade III (n = 2; -14.1, -52.9 and -43.1%), showing a greater significant decrease in Xc (p < 0.001). The greatest relative changes were in grade III injuries. However, decreases in R, that indicate fluid distribution, were not proportional to the severity of the injury. Disruption of the muscle structure, demonstrated by the localized determination of Xc, increased with the severity of muscle injury. The most significant changes 24 h after injury was the sizeable decrease in Xc that indicates a pattern of disrupted soft tissue structure, proportional to the severity of the injury.
下肢肌肉损伤在职业足球运动员中很常见。损伤根据严重程度进行分类，并通过放射学评估诊断为：I级（轻度拉伤或轻度损伤）、II级（部分断裂，中度损伤）和III级（完全断裂，重度损伤）。使用相敏分析仪在50kHz频率下进行的四极局部生物电阻抗分析（BIA），对21例股四头肌、腘绳肌和小腿肌肉损伤在受伤24小时后评估肌肉结构完整性损伤和液体蓄积情况，并通过磁共振成像（MRI）进行诊断。本研究的目的是根据MRI定义损伤的严重程度，确定BIA变量作为液体[电阻（R）]和细胞结构完整性[电抗（Xc）和相位角（PA）]指标的变化模式。与未受伤的对侧肌肉相比，受伤24小时后R、Xc和PA的差异百分比分别为：I级（n = 11；-10.4、-17.5和-9.0%）、II级（n = 8；-18.4、-32.9和-16.6%）和III级（n = 2；-14.1、-52.9和-43.1%），Xc的下降更显著（p < 0.001）。最大的相对变化出现在III级损伤中。然而，指示液体分布的R的下降与损伤的严重程度不成比例。通过局部测定Xc证明的肌肉结构破坏随肌肉损伤的严重程度增加。受伤24小时后最显著的变化是Xc大幅下降，这表明软组织结构破坏模式与损伤的严重程度成正比。
