Influence of visual scene velocity on segmental kinematics during stance.
Influence of visual scene velocity on segmental kinematics during stance.
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DOI：
10.1016/j.gaitpost.2009.05.001
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发表时间：
2009-08
期刊：
影响因子：
2.4
通讯作者：
Keshner, Emily A.
中科院分区：
文献类型：
--
作者：
Dokka, Kalpana;Kenyon, Robert V.;Keshner, Emily A.
我们研究了视觉环绕前后运动的速度如何影响站立期间的节段运动学。10名健康的年轻人暴露在沉浸式虚拟场景中，在0.05、0.1、0.2和0.55 Hz的4个频率下，以1.2至188 cm/s的5个峰值速度进行正弦振荡。计算头部、躯干、大腿和小腿角位移的均方根（RMS）值。计算头颈、髋关节、膝关节和踝关节角度的均方根值。在场景速度为188 cm/s时，头部、躯干、大腿和小腿位移的均方根值显著高于较低的场景速度。在125 cm/s和188 cm/s的场景速度下，与较低的场景速度相比，髋关节、膝关节和踝关节角度的均方根值显著增加。这些结果表明，即使在虚拟场景的高速移动过程中，视觉线索也会继续驱动姿势调整。下肢关节角度均方根值的显著增加表明，随着视觉诱导的姿势不稳定增加，身体主要被控制为多节段结构，而不是单链倒立摆，膝盖在姿势稳定中起关键作用。
We investigated how the velocity of anterior-posterior movement of a visual surround affected segmental kinematics during stance. Ten healthy young adults were exposed to sinusoidal oscillation of an immersive virtual scene at 5 peak velocities ranging from 1.2 to 188 cm/s at each of 4 frequencies: 0.05, 0.1, 0.2 and 0.55 Hz. Root mean square (RMS) values of head, trunk, thigh and shank angular displacements were calculated. RMS values of head-neck, hip, knee and ankle joint angles were also calculated. RMS values of head, trunk, thigh and shank displacements exhibited significant increases at a scene velocity of 188 cm/s when compared with lower scene velocities. RMS values of hip, knee and ankle joint angles exhibited significant increases at scene velocities of 125 and 188 cm/s when compared with lower scene velocities. These results suggest that visual cues continued to drive postural adjustments even during high velocity movement of the virtual scene. Significant increases in the RMS values of the lower-limb joint angles suggest that as visually-induced postural instability increased, the body was primarily controlled as a multi-segmental structure instead of a single-link inverted pendulum, with the knee playing a key role in postural stabilization.
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影响因子：
1.9
作者：
DIJKSTRA, TMH;SCHONER, G;GIELEN, CCAM
通讯作者：
GIELEN, CCAM
DOI：
10.1162/105474602317473259
发表时间：
2002-06-01
影响因子：
--
作者：
Duh, HBL;Lin, JJW;Furness, TA
通讯作者：
Furness, TA
影响因子：
2.4
作者：
Zhang, Yuanfen;Kiemel, Tim;Jeka, John
通讯作者：
Jeka, John
影响因子：
2.4
作者：
Streepey, Jefferson W.;Kenyon, Robert V.;Keshner, Emily A.
通讯作者：
Keshner, Emily A.
影响因子：
2
作者：
Thurrell, AEI;Bronstein, AM
通讯作者：
Bronstein, AM