PDF(Pubmed)
Abstract：
A noninvasive, immediate, and convenient method for assessing muscle tissue status during exercise-induced muscle damage (EIMD) has not been established. This study was designed to assess and determine parameters suitable for measuring EIMD after eccentric exercise, using multi-frequency bioimpedance analysis (BIA). Thirty-five young male participants performed dumbbell exercises with their left arm, and their BIA parameters were measured at various time points up to 168 h post exercise using a multi-frequency BIA device. At all-time points, intra and extracellular water content was greater in the left arm than in the right arm, whereas the impedance, reactance, resistance, and phase angle were lower in the left arm than in the right arm. Established EIMD indices, such as maximal isometric voluntary contraction, were measured and used in correlational analyses. Only reactance was correlated with biomarkers, indicating muscle damage (r = - 0.56 to - 0.49). Furthermore, reactance was found to correlate well with indirect indicators of EIMD, suggesting that it may be a suitable marker for evaluating EIMD. However, the relationship with the limited evaluation indices employed in this study is constrained. Future studies should investigate the correlation between reactance and direct damage indicators, such as structural damage, observed in biopsies.
摘要：
一种非侵入性的，立即,在运动性肌肉损伤（EIMD）期间评估肌肉组织状态的简便方法尚未建立。本研究旨在评估和确定适用于偏心运动后测量EIMD的参数，使用多频生物阻抗分析(BIA)。35名年轻男性参与者用左臂进行哑铃练习，使用多频BIA设备在运动后168小时内的各个时间点测量其BIA参数。在所有时间点，左臂内和细胞外含水量大于右臂，而阻抗，电抗,阻力,左臂的相位角低于右臂。已建立的EIMD指数，例如最大等距自愿收缩，进行了测量，并用于相关分析。只有电抗与生物标志物相关，表明肌肉损伤(r=-0.56至-0.49)。此外，发现电抗与EIMD的间接指标有很好的相关性，这表明它可能是评估EIMD的合适标记。然而,与本研究中使用的有限评价指标的关系是有限的。未来的研究应该调查电抗和直接伤害指标之间的相关性，如结构损坏，在活检中观察到。
