Département de Kinanthropologie, Université du Québec à Montréal, 141 Avenue du Président-Kennedy, Montréal, Québec, Canada.
Brain Res. 2011 Jan 25;1370:164-74. doi: 10.1016/j.brainres.2010.11.047. Epub 2010 Nov 27.
IT is a well-known fact that physiological tremor has a deleterious effect on small and precise movements. We recently showed that the amplitude of postural physiological tremor can be voluntarily reduced. Whether this is also applicable to tremor during small movements has not been explored.
This study aims to characterize tremor during movement, assess whether it is possible to reduce tremor amplitude during voluntary movements, and quantify any changes in accuracy that may result from this modulation.
Finger tremor was measured in 12 healthy volunteers using a laser displacement sensor and recorded during (A) a postural physiological tremor condition, (B) a slow target tracking task, and (C) the same tracking task while trying to reduce tremor amplitude.
The tremor characteristics such as distribution of power within the power spectrum remained similar during movement when compared to the static postural condition. Tremor amplitude was significantly reduced when participants attempted to do so. However, this reduction was accompanied with a systematic increase in error. Finally, mean error was significantly higher when the target line moved at higher velocity.
Our results demonstrate that tremor remains present during movement and that its amplitude can be voluntarily modulated. However, attempting to voluntarily reduce the amplitude of that tremor during movement is not an efficient way to improve tracking performance.
众所周知，生理震颤会对小而精确的运动产生有害影响。我们最近表明，姿势生理性震颤的幅度可以被主动降低。这种情况是否也适用于小运动时的震颤尚未被探索。
本研究旨在描述运动时的震颤，评估在自愿运动期间是否可以降低震颤幅度，并量化这种调制可能导致的任何准确性变化。
使用激光位移传感器在 12 名健康志愿者中测量手指震颤，并在（A）姿势生理性震颤状态、（B）缓慢目标跟踪任务和（C）尝试降低震颤幅度的同时进行相同跟踪任务时进行记录。
与静态姿势状态相比，运动时的震颤特征（如功率谱内的功率分布）保持相似。当参与者试图这样做时，震颤幅度显著降低。然而，这种降低伴随着误差的系统性增加。最后，当目标线以更高的速度移动时，平均误差显著更高。
我们的结果表明，震颤在运动时仍然存在，并且可以主动调节其幅度。然而，在运动期间试图主动降低震颤幅度并不是改善跟踪性能的有效方法。
