Vafadar Amirhossein K, Côté Julie N, Archambault Philippe S
McGill University, School of Physical and Occupational Therapy, Montreal, QC, Canada.
Motor Control. 2012 Apr;16(2):265-83. doi: 10.1123/mcj.16.2.265. Epub 2012 Feb 16.
The purpose of this study was to estimate the extent to which muscle fatigue can impact on the position sense in the upper limb. Twelve healthy volunteers were asked to do a reaching task while grasping a wooden block and match the block's position with a corresponding target displayed on a flat screen, without vision. Following that, subjects performed resistive exercises with Thera-band strips until fatigue was induced and then the position sense task was repeated. A significant change in the endpoint position was observed after fatigue, in the up/down direction (p ≤ .001). The variability of endpoint positions in up/down direction was also significantly increased after fatigue (p ≤.03). There was no significant change in endpoint orientation but there was a significant fatigue × orientation effect on endpoint rotational variability. In a follow-up experiment, a group of subjects repeated the same protocol, but with a period of quiet rest between the two position sense tasks. In that group, there were no differences in endpoint position, orientation or variability. Muscle fatigue is an important factor that should be taken into consideration during the treatment of musculoskeletal injuries as well as athletic training.
本研究的目的是评估肌肉疲劳对上肢位置觉的影响程度。12名健康志愿者被要求在抓取木块的同时完成一项够物任务，并在无视觉的情况下将木块位置与平板屏幕上显示的相应目标进行匹配。之后，受试者使用弹力带进行抗阻运动，直至诱发疲劳，然后重复位置觉任务。疲劳后，在上下方向观察到终点位置有显著变化（p≤0.001）。疲劳后，终点位置在上下方向的变异性也显著增加（p≤0.03）。终点方向没有显著变化，但在终点旋转变异性方面存在显著的疲劳×方向效应。在后续实验中，一组受试者重复相同方案，但在两项位置觉任务之间有一段安静休息时间。在该组中，终点位置、方向或变异性没有差异。肌肉疲劳是在肌肉骨骼损伤治疗以及运动训练过程中应予以考虑的一个重要因素。
