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  • Title: The relationships between knee extensors/ flexors strength and balance control in elite male soccer players.
    Author: Śliwowski R, Marynowicz J, Jadczak Ł, Grygorowicz M, Kalinowski P, Paillard T.
    Journal: PeerJ; 2021; 9():e12461. PubMed ID: 34820190.
    Abstract:
    BACKGROUND: Strength and balance are important factors for soccer players to be successful. This study's aim was to determine the relationship between lower-limb muscle strength and balance control in elite male soccer players (n = 77). METHODS: Concentric isokinetic strength (peak torque of quadriceps (PT-Q) and hamstrings (PT-H), hamstrings/quadriceps (H/Q) ratio) was measured for the dominant and non-dominant leg at angular velocities of 60°s-1and 240°s-1, as well as the total work for extensors (TW-Q) and flexors (TW-H) for both legs (at an angular velocity of 240°s-1only). Balance score (BAL score) was used for unilateral assessment of balance control using a Delos Postural System Test measurement tool. Hierarchical multiple regression analyses were performed to predict balance control using isokinetic knee strength performance for dominant and non-dominant legs. RESULTS: Final modelling included peak torque of hamstrings at 240°s-1 and peak torque of the quadriceps at 240°s-1 for the non-dominant leg (R 2 = 19.6%; p ≤ 0.001) and only peak hamstring torque at 240°s-1 for the dominant leg (R 2 = 11.3%; p = 0.003) as significant predictors of balance score. CONCLUSION: Findings indicate that balance control is widely influenced by peak hamstring torque and peak quadriceps torque at high angular velocity particularly in the non-dominant leg i.e., the supporting leg in soccer players.
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