Graduate Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre (UFCSPA), Porto Alegre, Brazil.
Eur J Sport Sci. 2021 Jan;21(1):131-139. doi: 10.1080/17461391.2020.1743766. Epub 2020 Mar 26.
Both injury history and eccentric knee flexor strength have been associated with risk of football players sustaining hamstring strain injury (HSI). However, it remains unclear whether football players who sustained HSIs in the prior season present persistent eccentric strength deficits. Therefore, the aim of the present study was to verify the eccentric knee flexor strength of professional male football players with and without history of HSI in the prior season. This case-control study assessed 210 professional male football players from 10 Brazilian clubs: 182 included in the control group and 28 in the previously injured group. Players from the injured group had suffered unilateral HSI in the prior season. We measured the knee flexors peak force during the Nordic hamstring exercise and calculated the between-limb asymmetry. Groups were similar for age, body mass and height ( > 0.05). Control group had similar strength values between left and right limbs (376.29 ± 61.77 N vs. 380.28 ± 61.77 N; = 0.27; = 0.06), while the previously injured limb was weaker than the contralateral uninjured limb in the injured group (350.87 ± 60.79 N vs. 385.75 ± 63.49 N; < 0.01; = 0.56). Thirty-seven percent of players in the control group and 50% in the injured group presented between-limb asymmetry >10%. This study demonstrates that players with history of HSI in the prior season present reduced eccentric knee flexor strength in the injured limb, but half of them have between-limb asymmetry within the most commonly adopted benchmark value of 10%.
既往的损伤史和离心膝关节屈肌力量与足球运动员发生腘绳肌拉伤（HSI）的风险相关。然而，目前尚不清楚在前一个赛季发生 HSI 的足球运动员是否存在持续的离心力量缺陷。因此，本研究旨在验证前一个赛季有 HSI 史和无 HSI 史的职业男性足球运动员的离心膝关节屈肌力量。这项病例对照研究评估了来自 10 家巴西俱乐部的 210 名职业男性足球运动员：182 名纳入对照组，28 名纳入前受伤组。受伤组的运动员在前一个赛季遭受了单侧 HSI。我们测量了北欧腘绳肌运动中的膝关节屈肌峰值力，并计算了肢体间的不对称性。两组在年龄、体重和身高方面相似（>0.05）。对照组左、右肢体的力量值相似（376.29±61.77 N 与 380.28±61.77 N； = 0.27； = 0.06），而前受伤肢体的力量弱于受伤组的对侧未受伤肢体（350.87±60.79 N 与 385.75±63.49 N； < 0.01； = 0.56）。对照组中有 37%的运动员和受伤组中有 50%的运动员出现肢体间不对称性>10%。本研究表明，在前一个赛季有 HSI 史的运动员在受伤肢体中表现出离心膝关节屈肌力量减弱，但其中一半人的肢体间不对称性在最常采用的 10%基准值范围内。
