School of Human Sciences (Sports Science, Exercise and Health), The University of Western, Crawley, Western Australia, Australia.
Minderoo Tech and Policy Lab, UWA Law School, The University of Western Australia, Crawley, Western Australia, Australia.
Scand J Med Sci Sports. 2022 Sep;32(9):1366-1376. doi: 10.1111/sms.14194. Epub 2022 Jun 8.
Frontal plane postures during the ultimate step of sidestepping are linked to increased anterior cruciate ligament injury risk. However, there is a lack of research detailing the kinematic strategies present in the penultimate step. This study, therefore, investigated penultimate and ultimate step kinematics of planned sidestepping (pSS) and unplanned sidestepping (upSS) to further understand the effect of planning time on known ultimate step kinematic and kinetic differences. Sixty male amateur Australian Rules football players performed three trials of straight-line running (RUN), pSS, and upSS in a randomized order. Mediolateral foot placement and three-dimensional joint kinematics for the knee, pelvis, and trunk were measured at final foot contact of the penultimate step and initial foot contact of the ultimate step. Peak knee moments were measured during the weight acceptance phase of the ultimate step. In pSS, at the penultimate step final foot contact, the support foot was placed across the midline of the center of mass, in the frontal plane, contralateral to the sidestep direction. Greater trunk lateral flexion toward the sidestep direction and greater negative pelvic lateral tilt were observed in pSS compared with upSS and RUN. Differences between pSS and upSS frontal plane kinematics at penultimate step final foot contact suggest preparatory reorientation strategies are likely constrained by the amount of planning time available. As there are clear differences in preparatory kinematics, we recommend that planning time be considered when training and assessing sidestepping maneuvers and planned and unplanned maneuvers not be treated as interchangeable skills.
在侧向跨步的最后一步中，前平面姿势与前交叉韧带损伤风险增加有关。然而，目前缺乏详细描述倒数第二步中存在运动学策略的研究。因此，本研究调查了计划侧向跨步（pSS）和非计划侧向跨步（upSS）的倒数第二步和最后一步的运动学，以进一步了解计划时间对已知最后一步运动学和动力学差异的影响。60 名男性业余澳大利亚足球运动员以随机顺序进行了三次直线跑（RUN）、pSS 和 upSS 的试验。在倒数第二步的最终足触地和最后一步的初始足触地时，测量了膝盖、骨盆和躯干的横向足放置和三维关节运动学。在最后一步的重量接受阶段测量了峰值膝盖力矩。在 pSS 中，在倒数第二步的最终足触地时，支撑脚放置在质心的中线，在正面，与侧步方向相反。与 upSS 和 RUN 相比，pSS 中观察到躯干向侧步方向的更大横向弯曲和骨盆的更大负横向倾斜。pSS 和 upSS 在倒数第二步最终足触地时的前平面运动学差异表明，准备重新定向策略可能受到可用计划时间的限制。由于准备运动学存在明显差异，因此我们建议在训练和评估侧向跨步动作时考虑计划时间，并认为计划和非计划动作不是可互换的技能。
