Vector coding reveals the underlying balance control strategies used by humans during translational perturbation.
Vector coding reveals the underlying balance control strategies used by humans during translational perturbation.
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DOI：
10.1038/s41598-022-24731-3
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发表时间：
2022-12-05
影响因子：
4.6
通讯作者：
Williams, Genevieve K. R.
中科院分区：
文献类型：
--
作者：
Taleshi, Naser;Brownjohn, James M. W.;Lamb, Sarah E.;Zivanovic, Stana;Williams, Genevieve K. R.
姿势控制研究主要集中在较大幅度移动平台（0.1-0.2 m）上的站立平衡实验。本研究研究了站在一个前后移动4毫米的平台上，频率从0.4到6赫兹线性缩放时的平衡策略。使用运动捕捉和力板系统记录9名健康参与者的平台运动、运动学和动力学信息。通过矢量编码量化髋、膝、踝关节力矩与质心、压力中心运动的协调性。平台频率对膝关节和COP-COM相位关系有显著的主效应（p = 0.023, p = 0.016）。在频率低于2.11和2.34 Hz时，采用踝部策略。在踝关节策略下，在放大和缩小过程中，COP- com的同相运动分别发生在低于2.19和2.23 Hz的频率下。当平台频率超过这些值时，COM控制了COP，随后是反相位膝踝扭矩，称为膝关节策略，COP和COM之间的反相位运动使COP重新控制了COM。总的来说，我们揭示了膝关节策略在现实生活中是一种新的相关策略，脚踝和膝关节策略之间的转换支撑了COP-COM相对运动之间的转换。
Postural control research has focused on standing balance experiments on platforms moving with relatively large amplitudes (0.1–0.2 m). This study investigated balance strategies while standing on a platform moving 4 mm in anterior-posterior direction with frequency scaled linearly from 0.4 to 6 Hz. Platform motion and kinematic and kinetic information for nine healthy participants were recorded using motion capture and force plate systems. Coordination between hip, knee and ankle joint torque, and centre of mass (COM) and centre of pressure (COP) motion was quantified by vector coding. Significant main effect of platform frequency for knee-ankle and COP-COM phase relationship was observed (p = 0.023, p = 0.016). At frequencies below 2.11 and 2.34 Hz, ankle strategy was recruited. With ankle strategy, in-phase COP-COM motion with COP dominancy occurred at frequencies below 2.19 and 2.23 Hz during scaling up and down, respectively. As platform frequency passed these values, COM dominated over COP which was followed by anti-phase knee-ankle torque, called a knee strategy, and anti-phase motion between the COP and COM that allowed COP to regain dominance over COM. Collectively, we reveal knee strategy as a new and relevant strategy in real-life settings, and transition between ankle and knee strategies that underpinned transition between COP-COM relative motion.
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