Relationship between pre-exercise muscle stiffness and muscle damage induced by eccentric exercise

Jingfei Xu, Siu Ngor Fu (Corresponding Author), Dong Zhou, Chen Huang, François Hug

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)508-516
Number of pages9
JournalEuropean Journal of Sport Science
Volume19
Issue number4
DOIs
Publication statusPublished - 21 Apr 2019

Keywords

  • Elastography
  • muscle damage
  • muscle tension
  • quadriceps femoris
  • ultrasound

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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