Department of Kinesiology and Sport Sciences, University of Miami, Coral Gables, FL, United States of America.
Department of Orthopaedics, University of Miami Health System - Sports Medicine Institute, Coral Gables, FL, United States of America.
PLoS One. 2024 Aug 16;19(8):e0309003. doi: 10.1371/journal.pone.0309003. eCollection 2024.
The purpose of this work was to provide a simple method to determine reactive strength during the 6-meter timed hop test (6mTH) and evaluate its association with isokinetic peak torque in patients following anterior cruciate ligament reconstruction (ACLR). Twenty-nine ACLR patients who were at least four months from surgery were included in this analysis. Participants were brought into the laboratory on one occasion to complete functional testing. Quadriceps and hamstring isokinetic testing was completed bilaterally at 60, 180, and 300 deg∙s-1, using extension peak torque from each speed as the outcome measure. The 6mTH was completed bilaterally using a marker-based motion capture system, and reactive strength ratio (RSR) was calculated from the vertical velocity of the pelvis during the test. An adjustment in RSR was made using the velocity of the 6mTH test to account for different strategies employed across participants. Repeated measures correlations were used to determine associations among isokinetic and hop testing variables. A two-way mixed analysis of variance was used to determine differences in isokinetic and hop testing variables between operated and non-operated legs and across male and female participants. Moderate positive associations were found between RSR (and adjusted RSR) and isokinetic peak torque at all speeds (r = .527 to .577). Mean comparisons showed significant main effects for leg and sex. Patients showed significant deficits in their operated versus non-operated legs in all isokinetic and hop testing variables, yet only isokinetic peak torque and timed hop time showed significant differences across male and female groups. Preliminary results are promising but further development is needed to validate other accessible technologies available to calculate reactive strength during functional testing after ACLR. Pending these developments, the effects of movement strategies, demographics, and levels of participation on RSR can then be explored to translate this simple method to clinical environments.
本研究旨在提供一种简单的方法来确定 6 米计时跳跃测试（6mTH）中的反应力量，并评估其与前交叉韧带重建（ACLR）后患者等速峰值扭矩的相关性。本分析纳入了 29 名 ACLR 术后至少 4 个月的患者。参与者在一次实验中进入实验室完成功能测试。使用基于标记的运动捕捉系统完成双侧 6mTH 测试，以每个速度的伸肌峰值扭矩作为结果测量值。从测试过程中骨盆的垂直速度计算反应强度比（RSR）。通过使用 6mTH 测试的速度对 RSR 进行调整，以考虑参与者采用的不同策略。使用重复测量相关分析来确定等速和跳跃测试变量之间的相关性。使用双向混合方差分析来确定手术和非手术腿之间以及男性和女性参与者之间等速和跳跃测试变量的差异。在所有速度下，RSR（和调整后的 RSR）与等速峰值扭矩之间均存在中度正相关（r =.527 至.577）。均值比较显示腿和性别存在显著的主要影响。与非手术腿相比，患者在所有等速和跳跃测试变量中均表现出明显的手术腿缺陷，但只有等速峰值扭矩和计时跳跃时间在男性和女性组之间存在显著差异。初步结果令人鼓舞，但需要进一步开发来验证 ACLR 后功能测试中其他可用技术来计算反应力量的有效性。在这些进展的基础上，可以进一步探索运动策略、人口统计学和参与程度对 RSR 的影响，以便将这种简单的方法转化为临床环境。
