Laboratoire Interdisciplinaire de Biologie de La Motricité, EA7424, Université de Savoie, Domaine Scientifique de Savoie-Technolac, 73376, Le Bourget du Lac cedex, France.
Laboratoire de Psychologie Et NeuroCognition, UMR5105, Université Grenoble-Alpes, BP47, 38040, Grenoble Cedex 9, France.
Exp Brain Res. 2020 May;238(5):1351-1358. doi: 10.1007/s00221-020-05814-x. Epub 2020 Apr 30.
The relevance of seesaw devices in postural evaluation and training is gathering growing evidence due to its sensory-motor specificity. Nonetheless, the physiological specificities resulting from the dissociation or not of the seesaws (single vs double) still need to be investigated, in particular by assessing the respective contribution of automatic and voluntary components in the postural control. A protocol based on attention disturbance through a dual-task paradigm was set to establish this contribution. The general assumption was that the larger the dual-task effects, the larger the voluntary component contribution. Based on the larger postural sway induced by the dissociated seesaws, it is expected that the larger dual-task effect occurs in that latter case. The subjects were required to stand with eyes closed on solid ground (SG), a single (SS) and a double (DS) seesaw device while mentally solving or not a navigation task. The movements of the seesaw, placed on a double force platform, were assessed through a frequency analysis of the resultant center-of-pressure displacements along both mediolateral and anteroposterior axes. A larger contribution (p < 0.05) of the voluntary component was observed when subjects were standing on the DS seesaw, especially along the mediolateral axis. This trend is thought to prepare for a step initiation and would be related to the threat encountered by the subjects. In contrast, performing a dual-task protocol does not affect the antero-posterior sway whatever the support conditions. These data give specific pointers for the relative cognitive demand in the postural strategies induced by the double seesaw device.
由于其感觉运动特异性，跷跷板设备在姿势评估和训练中的相关性正在得到越来越多的证据支持。然而，跷跷板（单脚或双脚）是否分离的生理特异性仍需要研究，特别是通过评估姿势控制中自动和自愿成分的各自贡献。建立了一个基于双任务范式注意力干扰的协议来评估这一贡献。一般假设是，双任务效应越大，自愿成分的贡献越大。基于分离的跷跷板引起的更大的姿势摆动，预计在后一种情况下会出现更大的双任务效应。要求受试者闭眼站在坚实的地面（SG）、单脚（SS）和双脚（DS）跷跷板上，同时在心理上解决或不解决导航任务。通过对沿前后和左右轴的压力中心位移的结果进行频率分析来评估跷跷板的运动，该跷跷板放置在双力平台上。当受试者站在 DS 跷跷板上时，自愿成分的贡献更大（p<0.05），特别是在左右轴上。这种趋势被认为是为了准备迈出一步，与受试者遇到的威胁有关。相比之下，无论支撑条件如何，执行双任务协议都不会影响前后摆动。这些数据为双脚跷跷板设备引起的姿势策略的相对认知需求提供了具体的线索。
