Univ. Lyon, UCBL-Lyon 1, Laboratoire Interuniversitaire de Biologie de la motricité, Villeurbanne, France.
Res Sports Med. 2023 Jul-Dec;31(4):331-341. doi: 10.1080/15438627.2021.1975117. Epub 2021 Sep 3.
This study investigated the effect of jump landing direction and leg dominance on the Dynamic Postural Stability Index (DPSI) and the importance of the hamstring-to-quadriceps (H/Q) co-activation ratio. Fifteen female sports players performed unilateral jump landing, for the dominant (DL) and the non-dominant (NDL) legs in anterior (AJL), lateral (LJL), and vertical directions (DJL). The results indicated that the DPSI was higher in DJL compared to LJL and AJL. Besides, the DPSI score during DJL was higher in NDL indicating lower stabilization capacity associated with a lower H/Q co-activation ratio. A significant correlation was found between H/Q co-activation ratio and DPSI in the DL during AJL (r = -0.57). Current results suggest that DJL was more appropriate to evaluate dynamic postural stability since it highlights limb asymmetry. In addition, H/Q co-activation appears to play an essential role in the effectiveness of ground reaction force stabilization during jump landing.
本研究旨在探讨跳跃着陆方向和腿部优势对动态姿势稳定指数（DPSI）的影响，以及腘绳肌与四头肌（H/Q）协同激活比率的重要性。15 名女性运动员分别进行了单侧跳跃着陆，包括优势腿（DL）和非优势腿（NDL）在前向（AJL）、侧向（LJL）和垂直方向（DJL）。结果表明，与 LJL 和 AJL 相比，DJL 时 DPSI 更高。此外，在 DJL 时，NDL 的 DPSI 得分更高，表明稳定性较低，与较低的 H/Q 协同激活比率相关。在 AJL 时，DL 中的 H/Q 协同激活比率与 DPSI 之间存在显著相关性（r=-0.57）。目前的结果表明，DJL 更适合评估动态姿势稳定性，因为它突出了肢体的不对称性。此外，H/Q 协同激活似乎在跳跃着陆时地面反作用力稳定的有效性中发挥着重要作用。
