BACKGROUND It has been shown that cognitive loading affects postural control in different populations. However, there is limited and conflicting information about dual task challenges on postural control in chronic ankle instability (CAI). RESEARCH QUESTION Does cognitive task performance change standing postural control in individuals with CAI, copers and healthy subjects? METHODS A descriptive, analytic, and controlled cross-sectional study was conducted on 75 individuals. They were assigned into three matched groups, including CAI, copers, and healthy controls. Postural control variables were collected during single leg standing on a force plate with and without vision and cognition. Parameters of center of pressure (COP), including mean COP area, range, sway index and velocity, were measured. Additionally, cognitive task performance by auditory stroop was assessed by calculating the reaction time and error ratio. Mixed model ANOVAs were used to determine the effects of group and testing conditions. RESULTS The CAI group demonstrated greater COP sway parameters compared to other groups under all testing conditions. The main significant effect of vision was observed for all COP parameters with greater COP sway during eyes closed compared to eyes open (P < 0.05). The main effect of a cognitive task was significant with reduced COP sway while performing the secondary cognitive compared to a single task in all three groups (P < 0.05). The cognitive task results revealed significantly longer reaction times in the CAI group compared to copers and healthy individuals (p < 0.05). SIGNIFICANCE Considering postural control deficits in CAI, especially in eye-closed condition and effects of cognitive loading, may guide us to improve postural control in those with CAI with neurocognitive training. Furthermore, no difference between coper and healthy groups may imply a successful compensatory postural control mechanism in copers.

中文翻译：

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慢性脚踝不稳，姿势和健康控制中姿势控制的注意要求：对照横断面研究。

背景技术已经表明，认知负荷会影响不同人群的姿势控制。但是，关于慢性踝关节不稳（CAI）中姿势控制双重任务挑战的信息有限且相互矛盾。研究问题认知任务的表现是否会改变CAI，copers和健康受试者的站立姿势控制能力？方法对75名个体进行了描述性，分析性和对照性横断面研究。他们被分为三个匹配的组，包括CAI，copers和健康对照。在有或没有视觉和认知的情况下，单腿站立在测力板上时收集姿势控制变量。测量了压力中心（COP）的参数，包括平均COP面积，范围，摇摆指数和速度。另外，通过计算反应时间和错误率来评估听觉步的认知任务绩效。混合模型方差分析用于确定组和测试条件的影响。结果在所有测试条件下，CAI组的COP摇摆参数均高于其他组。与闭眼相比，闭眼时COP摆动较大的所有COP参数均观察到视觉的主要显着影响（P <0.05）。与所有三个组中的单个任务相比，认知任务的主要效果与执行次级认知时的COP摆动降低相比具有显着意义（P <0.05）。认知任务的结果显示，与Copers和健康个体相比，CAI组的反应时间明显更长（p <0.05）。意义考虑到CAI中的姿势控制缺陷，特别是在闭眼状态和认知负荷的影响下，可能会指导我们改善接受神经认知训练的CAI患者的姿势控制。此外，铜和健康组之间没有差异可能暗示铜的成功的补偿性姿势控制机制。