SPM and GMCAO Teams, TIMC-IMAG Laboratory, UMR UJF CNRS 5525, Faculté de Médecine, 38706, La Tronche Cedex, France.
Exp Brain Res. 2010 Apr;202(1):253-9. doi: 10.1007/s00221-009-2122-9. Epub 2009 Dec 25.
The purpose of this study was to investigate whether vestibular and neck somatosensory weighting could change in conditions of trunk extensor muscle fatigue during quiet standing. To achieve this goal, 20 young healthy adults were asked to stand as still as possible in two conditions of No fatigue and Fatigue of trunk extensor muscles. In Experiment 1 (n = 10), the postural task was executed in two head conditions: Neutral and Head tilted backwards, recognised to degrade vestibular and neck somatosensory information. In Experiment 2 (n = 10), the postural task was executed in two stimulation conditions: No tactile stimulation and Tactile stimulation of the neck provided by the application of strips of adhesive bandage to the skin over and around the neck. The centre of foot pressure displacements (CoP) were recorded using a force platform. Results showed that (1) trunk extensor muscles fatigue increased CoP displacements under normal vestibular and neck somatosensatory conditions (Experiments 1 and 2), (2) this destabilizing effect of fatigue was exacerbated when vestibular and neck somatosensory information was altered (Experiment 1) and (3) this destabilizing effect of fatigue was suppressed when neck somatosensory information was neck was facilitated (Experiment 2). Taken together, results of Experiments 1 and 2 could be interpreted as an up-weighting of vestibular and neck somatosensory information for controlling posture during quiet standing following trunk extensor muscles fatigue.
本研究旨在探讨在躯干伸肌疲劳的情况下，前庭和颈部躯体感觉权重是否会发生变化。为了实现这一目标，要求 20 名年轻健康的成年人在两种条件下尽可能安静地站立：无疲劳和躯干伸肌疲劳。在实验 1（n=10）中，在两种头部条件下执行姿势任务：中性和头部向后倾斜，这会降低前庭和颈部躯体感觉信息。在实验 2（n=10）中，在两种刺激条件下执行姿势任务：无颈部触觉刺激和颈部触觉刺激，通过将条状粘性绷带贴在颈部和颈部周围的皮肤上提供。使用力平台记录足底压力位移（CoP）的中心。结果表明：（1）在正常的前庭和颈部躯体感觉条件下，躯干伸肌疲劳会增加 CoP 位移（实验 1 和 2）；（2）当改变前庭和颈部躯体感觉信息时，这种疲劳的不稳定性效应会加剧（实验 1）；（3）当颈部躯体感觉信息得到促进时，这种疲劳的不稳定性效应会被抑制（实验 2）。总的来说，实验 1 和 2 的结果可以解释为在躯干伸肌疲劳后，为了控制安静站立时的姿势，对前庭和颈部躯体感觉信息进行了加权。
