離心運動引起肌肉損傷對肌力參數的影響

Background: The performance of unaccustomed eccentric exercise can result in exercise-induced muscle damage (EIMD) and delayed onset muscle soreness (DOMS). This can cause a decrease in maximal voluntary isometric contraction (MVC) strength and rate of force development (RFD), which may affect the individual's ability to perform daily functions and increase the risk of injury. Although previous studies have proposed several different methods of muscle strength parameter to assess potential muscular power, it is not known which method can effectively evaluate the effects of EIMD. Purpose: The purpose of this study was to investigate different muscle strength parameters after EIMD of the unilateral elbow flexors (EF). Methods: Nine active young adult women (19-24 yrs) used either their right or left EF (determined by a counterbalanced method) to perform 72 maximal voluntary isokinetic (30°/s) eccentric contractions (EC). MVC and DOMS were measured before, immediately after, and 24, 48, 72, and 96 hours after EC. Additionally, time to peak torque (TPT) and RFD at 30-200 ms (RFD_(30-200)) were further assessed from MVC testing files. Changes in each dependent variable over time were measured by a one-way analysis of variance (ANOVA). Results: Changes in MVC, TPT, and DOMS were significant (p ＜ .05) after EC compared to their baseline levels, and these three variables had not returned (p ＜ .05) to their baseline levels at 96 hours after EC. No significant (p ＞ .05) changes were observed in RFD_(30-200) after EC. Conclusion: These results demonstrate that the magnitude of MVC loss and changes in TPT after EC show a similar pattern. Therefore, these results suggest that TPT may possibly be used as an effective monitoring method for recovery from EIMD and reduction of injuries.