Hamstrings fatigue does not improve quadriceps function in individuals with anterior cruciate ligament reconstruction.

Autor: Rush JL; Department of Exercise and Rehabilitation Sciences, University of Toledo, Toledo, OH, USA. Electronic address: Justin.Rush@rockets.utoledo.edu., Norte GE; Department of Exercise and Rehabilitation Sciences, University of Toledo, Toledo, OH, USA. Electronic address: Grant.norte@utoledo.edu.
Jazyk: angličtina
Zdroj: Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine [Phys Ther Sport] 2023 May; Vol. 61, pp. 20-26. Date of Electronic Publication: 2023 Feb 18.
DOI: 10.1016/j.ptsp.2023.02.006
Abstrakt: Objectives: Our purpose was to investigate the immediate and prolonged effects of hamstrings fatigue on quadriceps neuromuscular function in individuals with anterior cruciate ligament reconstruction (ACLR) and matched uninjured controls.
Design: Cross-Sectional.
Setting: Laboratory.
Participants: 16 participants with a history of ACLR and 16 uninjured controls.
Main Outcome Measures: Quadriceps peak torque (PT), central activation ratio (CAR), early (RTD 100 ) and late (RTD 200 ) rate of torque development, vastus medialis and lateralis electromyographic (EMG) activity, and hamstrings-to-quadriceps co-activation assessed at baseline. Outcomes were evaluated pre-fatigue (PRE), immediately post-fatigue (POST), and 30min post-fatigue (POST30). The involved limbs of individuals with ACLR were assessed and control limbs were matched based on limb dominance.
Results: Individuals with ACLR demonstrated lesser quadriceps PT (p = 0.004), CAR (p < 0.001), RTD 100 (p = 0.042), RTD 200 (p = 0.028), and vastus medialis EMG (p = 0.040) than controls, regardless of time. Quadriceps CAR (p < 0.001) and RTD 200 (p < 0.001) decreased at POST and POST30, whereas RTD 100 (p < 0.001) decreased at POST, regardless of group.
Conclusions: The observed reductions in quadriceps neuromuscular function may suggest involvement of central fatigue mechanisms, which should be explored prior to recommending hamstrings fatigue as a therapeutic intervention.
(Published by Elsevier Ltd.)
Databáze: MEDLINE
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