Countermovement Jump Kinetic Impairments in Elite Athletes Before and After ACL Injury: Force-Time Waveform Versus Discrete Kinetic Analysis.

IF 1.2 Q3 SPORT SCIENCES
Translational sports medicine Pub Date : 2025-05-07 eCollection Date: 2025-01-01 DOI:10.1155/tsm2/1176787
Cassidy de França, Matthew J Jordan, Tanita Botha, Helen Bayne
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Abstract

Pre-injury and post-injury countermovement jump (CMJ) force-time data were obtained for elite athletes 6 months after anterior cruciate ligament surgery (ACLR). Jump kinetics were analysed using a traditional phase-specific approach, and force-time data of the CMJ waveform were analysed using statistical parametric mapping (SPM). Elite athletes (n = 10; female n = 6, age = 22.0 ± 3.5 years, mass = 75.9 ± 11.5 kg) performed CMJ testing before (T0) and after ACLR (T1; 24 ± 3 weeks post-surgery). Differences in discrete and continuous metrics were analysed for (1) within-limb differences between T1 and T0 and (2) between-limb differences at T1 and T0. Lower involved limb propulsive impulse (T1: 6.4 ± 1.6 N∙s/kg; T0: 7.7 ± 1.4 N∙s/kg, p = 0.002) and peak force (T1: 6.4 ± 1.6 N/kg; T0: 7.7 ± 1.4 N/kg, p = 0.002) were found after ACLR compared to baseline. After ACLR (T1), lower involved limb propulsive impulse was found compared to the uninvolved limb (involved: 1.26 ± 0.54 N∙s/kg; uninvolved: 1.58 ± 0.56 N∙s/kg, p = 0.007). SPM analysis revealed specific within-limb force loss, notably reduced involved limb propulsion force at T1 compared to pre-injury at T0 (p < 0.001) between 92% and 99% of the CMJ (end of propulsion) and between 36% and 37% of the CMJ (i.e., late unweighting to braking phase transition). SPM analysis revealed within-limb CMJ force loss that was not seen with the discrete analysis, highlighting the complementary value of SPM waveform analysis alongside discrete analysis to identify neuromuscular impairments in stretch-shortening-cycle function in elite athletes after ACLR.

顶尖运动员前交叉韧带损伤前后的反动作跳跃运动损伤:力-时间波形与离散运动分析。
对优秀运动员前交叉韧带手术(ACLR)后6个月的损伤前和损伤后的反运动跳跃(CMJ)力-时间数据进行了研究。采用传统的相位特定方法分析跳跃动力学,采用统计参数映射(SPM)分析CMJ波形的力-时间数据。优秀运动员(n = 10;女性n = 6,年龄= 22.0±3.5岁,体重= 75.9±11.5 kg)在ACLR术前(T0)和术后(T1;术后24±3周)。分析离散和连续指标的差异(1)T1和T0之间的肢体内差异和(2)T1和T0时的肢体间差异。下受累肢体推进冲量(T1: 6.4±1.6 N∙s/kg;T0: 7.7±1.4 N∙s /公斤,p = 0.002)和峰值力(T1: 6.4±1.6 N /公斤;T0: 7.7±1.4 N/kg, p = 0.002)。ACLR (T1)后,与未受累肢体相比,较低受累肢体的推进冲动(受累肢体:1.26±0.54 N∙s/kg;未参与:1.58±0.56 N∙s/kg, p = 0.007)。SPM分析揭示了特定的肢体内力损失,与T0损伤前相比,T1时涉及的肢体推进力减少了92%至99%的CMJ(推进结束)和36%至37%的CMJ(即制动相变后期失重)(p < 0.001)。SPM分析揭示了离散分析没有发现的肢体内CMJ力损失,突出了SPM波形分析与离散分析在识别ACLR后优秀运动员拉伸-缩短周期功能的神经肌肉损伤方面的互补价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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