Andreopoulou Georgia, Maaswinkel Erwin, Cofré Lizama L Eduardo, van Dieën Jaap H
MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands.
Exp Brain Res. 2015 Apr;233(4):1079-87. doi: 10.1007/s00221-014-4185-5. Epub 2014 Dec 24.
This study aimed to examine the interactions of visual, vestibular, proprioceptive, and tactile sensory manipulations and sitting on either a stable or an unstable surface on mediolateral (ML) trunk sway. Fifteen individuals were measured. In each trial, subjects sat as quiet as possible, on a stable or unstable surface, with or without each of four sensory manipulations: visual (eyes open/closed), vestibular (left and right galvanic vestibular stimulation alternating at 0.25 Hz), proprioceptive (left and right paraspinal muscle vibration alternating at 0.25 Hz), and tactile (minimal finger contact with object moving in the frontal plane at 0.25 Hz). The root mean square (RMS) and the power at 0.25 Hz (P25) of the ML trunk acceleration were the dependent variables. The latter was analyzed only for the rhythmic sensory manipulations and the reference condition. RMS was always significantly larger on the unstable than the stable surface. Closing the eyes caused a significant increase in RMS, more so on the unstable surface. Vestibular stimulation significantly increased RMS and P25 and more so on the unstable surface. Main effects of the proprioceptive manipulation were significant, but the interactions with surface condition were not. Finally, also tactile manipulation increased RMS and P25, but did not interact with surface condition. Sensory information in feedback control of trunk posture appears to be reweighted depending on stability of the environment. The absolute effects of visual and vestibular manipulations increase on an unstable surface, suggesting a relative decrease in the weights of proprioceptive and tactile information.
本研究旨在探讨视觉、前庭、本体感觉和触觉感觉操纵以及坐在稳定或不稳定表面上对躯干左右（ML）摆动的影响。对15名个体进行了测量。在每次试验中，受试者尽可能安静地坐在稳定或不稳定的表面上，进行或不进行以下四种感觉操纵中的每一种：视觉（睁眼/闭眼）、前庭（左右前庭电刺激以0.25Hz交替）、本体感觉（左右椎旁肌振动以0.25Hz交替）和触觉（手指与在额平面以0.25Hz移动的物体有最小接触）。ML躯干加速度的均方根（RMS）和0.25Hz处的功率（P25）为因变量。仅对有节奏的感觉操纵和参考条件分析了后者。在不稳定表面上的RMS总是显著大于稳定表面。闭眼会导致RMS显著增加，在不稳定表面上增加得更多。前庭刺激显著增加了RMS和P25，在不稳定表面上增加得更多。本体感觉操纵的主效应显著，但与表面条件的相互作用不显著。最后，触觉操纵也增加了RMS和P25，但与表面条件没有相互作用。在躯干姿势的反馈控制中，感觉信息似乎根据环境的稳定性进行重新加权。视觉和前庭操纵的绝对效应在不稳定表面上增加，表明本体感觉和触觉信息的权重相对降低。
