Early postural adjustments in preparation to whole-body voluntary sway.
Early postural adjustments in preparation to whole-body voluntary sway.
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DOI：
10.1016/j.jelekin.2011.11.005
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发表时间：
2012-02
影响因子：
2.5
通讯作者：
Latash, Mark L.
中科院分区：
文献类型：
--
作者：
Klous, Miriam;Mikulic, Pavle;Latash, Mark L.
我们研究了在两种条件下与快速自愿姿势摇摆相关的姿势调整，自定步调和简单反应时间。要求站立受试者产生压力中心（COP）向前的快速离散移位。约400-500 ms之前，指示的COP转变，有偏差的COP在相反的方向（向后）伴随着几个姿势肌肉的激活水平的变化。在反应时间条件下，这些早期姿势调整的时间没有改变（重复测量MANOVA：p>0.05），而其幅度显著增加（通过重复测量MANOVA证实：p<0.05）。这些观察结果与简单反应时间条件下的预期姿势调整（时间上的显著变化，幅度上没有重大变化）的报告相反。我们的结论是，有两种类型的前馈姿势调整。早期的姿势调整使身体为计划的动作和/或预期的扰动做好准备。这些准备行动中的一些可能是机械上必要的。随后，预期的姿势调整产生净力和力矩，作用于与预期扰动相关的力和力矩。这两种类型的调整很好地符合所指配置假设，它提供了一个统一的观点运动姿势控制。
We studied postural adjustments associated with a quick voluntary postural sway under two conditions, self-paced and simple reaction-time. Standing subjects were required to produce quick discrete shifts of the center of pressure (COP) forward. About 400–500 ms prior to the instructed COP shift, there were deviations of the COP in the opposite direction (backwards) accompanied by changes in the activation levels of several postural muscles. Under the reaction-time conditions, the timing of those early postural adjustments did not change (repeated measures MANOVA: p>0.05) while its magnitude increased significantly (confirmed by repeated measures MANOVA: p<0.05). These observations are opposite to those reported for anticipatory postural adjustments under simple reaction time conditions (a significant change in the timing without major changes in the magnitude). We conclude that there are two types of feed-forward postural adjustments. Early postural adjustments prepare the body for the planned action and/or expected perturbation. Some of these preparatory actions may be mechanically necessary. Later, anticipatory postural adjustments generate net forces and moments of force acting against those associated with the expected perturbation. Both types of adjustments fit well the referent configuration hypothesis, which offers a unified view on movement-posture control.
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影响因子：
2.5
作者：
HIRSCHFELD, H;FORSSBERG, H
通讯作者：
FORSSBERG, H
影响因子：
6
作者：
ELBLE, RJ;THOMAS, SS;COLLIVER, J
通讯作者：
COLLIVER, J
DOI：
10.1016/j.clinph.2011.09.014
发表时间：
2012-05
期刊：
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
影响因子：
--
作者：
Krishnan V;Latash ML;Aruin AS
通讯作者：
Aruin AS
影响因子：
6.7
作者：
MASSION, J
通讯作者：
MASSION, J
影响因子：
2.4
作者：
BOUISSET, S;ZATTARA, M
通讯作者：
ZATTARA, M