Relationship between pre-exercise muscle stiffness and muscle damage induced by eccentric exercise
Relationship between pre-exercise muscle stiffness and muscle damage induced by eccentric exercise
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运动前肌肉僵硬与离心运动引起的肌肉损伤的关系
DOI：
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发表时间：
2018
影响因子：
3.2
通讯作者：
F. Hug
中科院分区：
文献类型：
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作者：
Jingfei Xu;S. Fu;Dong Zhou;Chen Huang;F. Hug
摘要本研究旨在确定运动前肌肉僵硬度是否与离心运动引起的肌肉损伤量有关，并确定运动后肌肉僵硬度的增加是否均匀分布在肌肉之间。50名健康参与者被随机分配到离心运动组或对照组。分别于离心运动前、离心运动后即刻及离心运动后48 h测定股直肌（RF）、股外侧肌（VL）和股内侧斜肌（VMO）的剪切模量（刚度指标）。还测量了最大等长随意膝关节伸展（MVC）扭矩。与运动前相比，偏心组在运动后和48小时的MVC扭矩均显著降低（均p <0.001）。离心运动后，在90°膝关节屈曲时和48小时后进行评估时，RF剪切模量显著增加（分别为p = 0.004和0.005）。在运动后，偏心组观察到VL剪切模量轻微但显著降低（p = .002）。VMO无变化。48 H时MVC的降低与运动前膝关节屈曲90°时测得的RF剪切模量呈负相关。离心运动引起大范围的峰值扭矩降低和肌肉-头部特异性调节肌肉刚度。参与者RF肌肉僵硬表现出更大的减少，在离心运动后48小时的力量产生能力。
Abstract This study aimed to determine whether pre-exercise muscle stiffness is related to the amount of muscle damage induced by an eccentric exercise and to determine whether the post-exercise increase in stiffness is homogenously distributed between the synergist muscles. Fifty healthy participants were randomly assigned to an eccentric exercise group or a control group. The shear modulus (an index of stiffness) of rectus femoris (RF), vastus lateralis (VL) and vastus medialis oblique (VMO) was measured before, immediately after and at 48 h after eccentric exercise. The maximal isometric voluntary knee extension (MVC) torque was also measured. Significant reduction in MVC torque was observed in the eccentric group both at post and 48 H when compared with pre-exercise (both p < .001). RF shear modulus increased significantly when assessed at 90° of knee flexion at post and 48 H after the eccentric exercise (p = .004 and .005, respectively). Slight but significant decrease in VL shear modulus was observed at post-exercise for the eccentric group (p = .002). No change was observed in VMO. The decrease in MVC at 48 H was negatively correlated with the RF shear modulus measured at 90° of knee flexion before the exercise. Eccentric exercise induced a wide range of peak torque reduction and muscle-head specific modulation on muscle stiffness. Participants with stiffer RF muscles exhibited greater decrease in force generating capacity at 48 H after eccentric exercise.
影响因子：
2.4
作者：
Eby, Sarah F.;Song, Pengfei;Chen, Shigao;Chen, Qingshan;Greenleaf, James F.;An, Kai-Nan
通讯作者：
An, Kai-Nan