Center for Advanced Research in Sleep Medicine, Hôpital du Sacré-Cœur de Montréal, Montréal, QC, Canada.
Clin Neurophysiol. 2011 Sep;122(9):1771-8. doi: 10.1016/j.clinph.2011.02.010. Epub 2011 Mar 10.
This study aimed to determine how increased sleep pressure interferes with postural control according to the availability of attentional resources and visual input.
Thirteen healthy young adults performed a psychomotor vigilance task and postural tasks after a night of sleep and after 25 h of sleep deprivation. Primary outcome variables were calculated from the center of pressure (CoP) displacement measured by two force plates in various cognitive load and visual state conditions.
Sleep deprivation increased CoP anterior-posterior range in the no cognitive load condition and decreased CoP mediolateral range and velocity in the high cognitive load conditions. Sleep deprivation effects on the mediolateral range in the eyes open high cognitive load condition were significantly correlated with its effects on the psychomotor vigilance task.
Sleep deprivation destabilizes postural control when attentional and sensory resources are not challenged. In high cognitive load condition, sleep loss induces a general freezing effect that seems to be modulated by the degree of impairment in psychomotor speed.
This study demonstrates that sleep pressure has a destabilizing effect on postural control independently of circadian factors, therefore suggesting that sleep debt may be a significant risk factor for falls.
本研究旨在确定睡眠压力增加如何根据注意力资源和视觉输入的可用性干扰姿势控制。
13 名健康的年轻成年人在一夜睡眠和 25 小时睡眠剥夺后进行了精神运动警觉任务和姿势任务。通过两个压力板在各种认知负荷和视觉状态条件下测量的中心压力（CoP）位移计算主要结果变量。
睡眠剥夺增加了无认知负荷条件下的 CoP 前后范围，并降低了高认知负荷条件下的 CoP 左右范围和速度。睡眠剥夺对睁眼高认知负荷条件下 CoP 左右范围的影响与对精神运动警觉任务的影响显著相关。
当注意力和感觉资源不受挑战时，睡眠剥夺会使姿势控制不稳定。在高认知负荷条件下，睡眠剥夺会导致普遍的冻结效应，这种效应似乎受到精神运动速度受损程度的调节。
这项研究表明，睡眠压力对姿势控制具有稳定作用，与昼夜节律因素无关，因此表明睡眠债务可能是跌倒的一个重要危险因素。
