Laboratoire Interuniversitaire de Biologie de la Motricité (LIBM) EA 7424, Université Claude Bernard Lyon 1, Univ Lyon, F-69622, Villeurbanne Cedex, France.
Department of Rehabilitation, Université Laval, Quebec City, Canada.
Sci Rep. 2021 Jul 2;11(1):13788. doi: 10.1038/s41598-021-93240-6.
Motor imagery (MI) is usually facilitated when performed in a congruent body position to the imagined movement, as well as after actual execution (AE). A lower-limb amputation (LLA) results in important structural and functional changes in the sensorimotor system, which can alter MI. In this study, we investigated the effects of body position and AE on the temporal characteristics of MI in people with LLA. Ten participants with LLA (mean age = 59.6 ± 13.9 years, four females) and ten gender- and age-matched healthy control participants (mean age = 60.1 ± 15.4 years, four females) were included. They performed two locomotor-related tasks (a walking task and the Timed Up and Go task) while MI times were measured in different conditions (in congruent/incongruent positions and before/after AE). We showed that MI times were significantly shorter when participants imagined walking in a congruent-standing position compared to an incongruent-sitting position, and when performing MI after actual walking compared to before, in both groups. Shorter MI times in the congruent position and after AE suggest an improvement of MI's temporal accuracy (i.e. the ability to match AE time during MI) in healthy individuals but not in the LLA group.
运动想象（MI）通常在与想象运动一致的身体姿势下以及在实际执行（AE）后得到促进。下肢截肢（LLA）会导致感觉运动系统的重要结构和功能变化，从而改变 MI。在这项研究中，我们研究了身体姿势和 AE 对 LLA 患者 MI 的时间特征的影响。10 名 LLA 参与者（平均年龄=59.6±13.9 岁，4 名女性）和 10 名性别和年龄匹配的健康对照组参与者（平均年龄=60.1±15.4 岁，4 名女性）被纳入研究。他们在不同条件下（在一致/不一致的位置以及在 AE 之前/之后）执行了两项与步行相关的任务（步行任务和计时起立行走任务），同时测量了 MI 时间。结果显示，与想象坐在不一致的位置相比，参与者在想象站立的一致位置下进行步行想象时，以及在实际行走后进行 MI 时，MI 时间明显缩短，两组结果一致。在健康个体中，MI 在一致位置和 AE 后时间更短，这表明 MI 的时间准确性（即在 MI 期间匹配 AE 时间的能力）得到了提高，但在 LLA 组中没有观察到这种现象。
