Abstract
The purpose of this study was to determine the isokinetic profile of specialized athletes with previous hamstring tears and recurrent complaints upon return to sports activities, using a Kintrex 500 dynamometer. Twenty-three subjects were examined through a concentric protocol and fifteen of them benefited from a complementary eccentric assessment. Despite the fact that some cases presented normal isokinetic results, the statistical analysis has demonstrated particular features. In reference to the non-involved side performances, the average reduction of peak torque (PT) of the injured muscles surpassed 20% in eccentric contraction. The relationship between bodyweight normalized PT and angular velocity demonstrated significant differences in comparison with those of selected non-injured sprinters, most notably in the eccentric sector. A mixed ratio (Flexors eccentric /Quadriceps concentric ) appeared significantly reduced (0.75 ± 0.23) for the injured leg, in comparison with the contralateral non-injured limb (0.90 ± 0.16) and with a control population (0.98 ± 0.14). For the eccentric mode, the angle of peak torque (APT) of the strained muscle occurred in an abnormal articular sector corresponding to a weaker hamstring muscle lengthening than normal. These observations strongly suggest that, among the causative factors, the persistence of muscle strength abnormalities gives rise to recurring hamstring injuries.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.