The effects of core muscle fatigue on lower limbs and trunk during single-leg drop landing: A comparison between recreational runners with and without dynamic knee valgus.

Autor: Curi GOBDC; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil. Electronic address: ginabrigidocuri@gmail.com., Costa FDD; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil., Medeiros VS; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil., Barbosa VD; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil., Santos TRT; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil., Dionisio VC; Faculty of Physical Education and Physiotherapy, Federal University of Uberlandia, Uberlandia MG, Brazil.
Jazyk: angličtina
Zdroj: The Knee [Knee] 2024 Oct; Vol. 50, pp. 96-106. Date of Electronic Publication: 2024 Aug 10.
DOI: 10.1016/j.knee.2024.07.017
Abstrakt: Background: A deficit in neuromuscular trunk control can impact the lower limb motion, predisposing runners to injuries. This deficit may show a greater impact on runners with dynamic knee valgus. This study aimed to compare the effect of core fatigue on kinetic, kinematic, and electromyographic parameters of the trunk and lower limbs during single-leg drop landing between runners with and without dynamic knee valgus.
Methods: Twenty-seven recreational runners were allocated to the valgus (n = 14) and non-valgus groups (n = 13). They performed the test before and after a fatigue protocol, taking a step forward and landing on the force platform while maintaining balance. The fatigue protocol included isometric and dynamic exercises performed consecutively until voluntary exhaustion. The vertical ground reaction force, the sagittal and frontal plane angles, and the electromyographic activity were evaluated. The integral of electromyographic activity was calculated into three movement phases. ANOVA with repeated measures was used to verify the group, time, and interaction effects.
Results: After fatigue, both groups showed a significant reduction in the minimum (p = 0.01) and maximum (p = 0.02) knee angles in the frontal plane (more dynamic knee valgus) and greater gluteus medius activity (p = 0.05) from the peak of knee flexion to the end of the movement. The valgus group had a greater hip excursion (p = 0.01) and vertical linear shoulder displacement (p = 0.02) than the non-valgus.
Conclusion: Our results suggest that core fatigue can impact the local muscle and the distal joint and that the groups presented different strategies to deal with the demand during landing.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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