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http://hdl.handle.net/10397/93251
Title: | Relationship between pre-exercise muscle stiffness and muscle damage induced by eccentric exercise | Authors: | Xu, J Fu, SN Zhou, D Huang, C Hug, F |
Issue Date: | 2019 | Source: | European journal of sport science, 2019, v. 19, no. 4, p. 508-516 | 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. | Keywords: | Elastography Muscle damage Muscle tension Quadriceps femoris Ultrasound |
Publisher: | Taylor & Francis | Journal: | European journal of sport science | ISSN: | 1746-1391 | EISSN: | 1536-7290 | DOI: | 10.1080/17461391.2018.1535625 | Rights: | © 2018 European College of Sport Science This is an Accepted Manuscript of an article published by Taylor & Francis in European Journal of Sport Science on 26 Oct 2018 (published online), available at: http://www.tandfonline.com/10.1080/17461391.2018.1535625. |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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Xu_Relationship_Between_Pre-Exercise.pdf | Pre-Published version | 1.27 MB | Adobe PDF | View/Open |
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