Read Paul J, Pedley Jason S, Eirug Ifan, Sideris Vasileios, Oliver Jon L
Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
Institute of Sport Exercise and Health, London, United Kingdom.
J Strength Cond Res. 2022 May 1;36(5):1238-1244. doi: 10.1519/JSC.0000000000004208. Epub 2022 Jan 5.
Read, PJ, Pedley, JS, Eirug, I, Sideris, V, and Oliver, JL. Impaired stretch-shortening cycle function persists despite improvements in reactive strength followingafter anterior cruciate ligament reconstruction. J Strength Cond Res 36(5): 1238-1244, 2022-Reactive strength index (RSI) during a single-leg drop jump (SLDJ) has been indicated to determine return-to-sport readiness after anterior cruciate ligament (ACL) reconstruction, but only cross-sectional studies are available. Ground reaction force data and characterization of stretch-shortening cycle (SSC) function also remain sparse. Single-leg drop jump performance, ground reaction force, and SSC function were examined in soccer players with ACL reconstruction (n = 26) and matched controls (n = 25). Injured players were tested at 2 time points (32 and 42 weeks postsurgery). Stretch-shortening cycle function was classified as good (no impact peak and spring like), moderate (impact peak but still spring like or no impact peak and not spring like), or poor (impact peak and not spring like). The involved limb displayed lower-jump height, poorer RSI, less spring-like behavior, earlier peak landing force, and a greater ratio of landing peak to take-off peak force compared with the uninvolved limb and controls at the initial assessment (p < 0.001). Proportionally, more involved limbs were categorized as poor or moderate at the initial assessment (69.2%) and follow-up (50%) in comparison with the control limbs (14%). The reactive strength index was the only variable to change significantly between the initial assessment and follow-up on the involved limb (p < 0.05). No changes in the proportion of ACL reconstructed individuals categorized as poor or moderate SSC function at the follow-up assessment were observed. Residual deficits are present in SLDJ performance, SSC function, and ground reaction force characteristics after ACL reconstruction. The reactive strength index should not be the sole metric, as observed increases did not correspond with changes in SSC function.
里德，PJ、佩德利，JS、艾鲁格，I、西代里斯，V和奥利弗，JL。尽管前交叉韧带重建术后反应力量有所改善，但拉长-缩短周期功能仍受损。《力量与体能研究杂志》36(5): 1238 - 1244，2022年——单腿下蹲跳（SLDJ）期间的反应力量指数（RSI）已被用于确定前交叉韧带（ACL）重建术后的运动恢复准备情况，但目前仅有横断面研究。地面反作用力数据以及拉长-缩短周期（SSC）功能的特征研究也仍然较少。对26名接受ACL重建的足球运动员和25名匹配的对照组进行了单腿下蹲跳表现、地面反作用力和SSC功能的检测。受伤球员在术后2个时间点（术后32周和42周）接受测试。SSC功能被分为良好（无冲击峰值且呈弹簧状）、中等（有冲击峰值但仍呈弹簧状或无冲击峰值且不呈弹簧状）或较差（有冲击峰值且不呈弹簧状）。在初始评估时，与未受伤肢体和对照组相比，患侧肢体的跳跃高度更低、RSI更差、弹簧状行为更少、峰值着陆力更早出现，且着陆峰值与起跳峰值力的比值更大（p < 0.001）。与对照组肢体（14%）相比，在初始评估（69.2%）和随访（50%）时，患侧肢体中比例更高的被归类为较差或中等。反应力量指数是患侧肢体在初始评估和随访之间唯一有显著变化的变量（p < 0.05）。在随访评估中，未观察到被归类为SSC功能较差或中等的ACL重建个体比例发生变化。ACL重建术后，单腿下蹲跳表现、SSC功能和地面反作用力特征仍存在残余缺陷。反应力量指数不应作为唯一指标，因为观察到的增加与SSC功能的变化并不对应。
